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ART002075662
|
oai_dc
|
Stability analyses of a cylindrical steel silo with corrugated sheets and columns
|
Stability analyses of a cylindrical steel silo with corrugated sheets and columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jacek Tejchman(Gdańsk University of Technology); Mateusz Sondej(Gdańsk University of Technology); Piotr Iwicki(Gdańsk University of Technology); Michał Wójcik(Gdańsk University of Technology)"
] |
The paper presents comprehensive quasi-static stability analysis results for a real funnel-flow cylindrical steel silo composed of horizontally corrugated sheets strengthened by vertical thin-walled column profiles. Linear buckling and non-linear analyses with geometric and material non-linearity were carried out with a perfect and an imperfect silo by taking into account axisymmetric and non-axisymmetric loads imposed by a bulk solid following Eurocode 1. Finite element simulations were carried out with 3 different numerical models (single column on the elastic foundation, 3D silo model with the equivalent orthotropic shell and full 3D silo model with shell elements). Initial imperfections in the form of a first eigen-mode for different wall loads and from 꼒n-situ. measurements with horizontal different amplitudes were taken into account. The results were compared with Eurocode 3. Some recommendations for the silo dimensioning were elaborated.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.1.147
|
kci_detailed_000102.xml
|
||
ART002075655
|
oai_dc
|
Research on cold-formed steel connections: A state-of-the-art review
|
Research on cold-formed steel connections: A state-of-the-art review
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ying Qin(Southeast University); Zhi-Hua Chen(Tianjin University)"
] |
Cold-formed steel structures are increasingly attractive due to their benefits of good mechanical performance and constructional advantages. However, this type of construction is still not fully exploited as a result of the acknowledged difficulties involved in forming construction-efficient and cost-effective connections. Furthermore, there is a lack of information on the structural behavior of the cold-formed steel connections. In this study, the research on various cold-formed steel connections was comprehensively reviewed from both fundamental and structural points of view, based on the available experimental and analytical data. It reveals that the current design codes and guidelines for cold-formed steel connections tend to focus more on the individual bearing capacity of the fasteners rather than the overall structural behavior of the connections. Significant future work remains to be conducted on the structural performance of cold-formed steel connection. In addition, extensive previous research has been carried out to propose and evaluate an economical and efficient connection system that is obtained from the conventional connecting techniques used in the hot-rolled industry. These connecting techniques may not be suitable, however, as they have been adopted from hot-rolled steel portal frames due to the thinness of the sheet in cold-formed steels. The review demonstrates that with the increasing demand for cold-formed steel constructions throughout the world, it is crucial to develop an efficient connection system that can be prefabricated and easily assembled on site.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.1.021
|
kci_detailed_000102.xml
|
||
ART002075657
|
oai_dc
|
Distortional buckling of I-steel concrete composite beams in negative moment area
|
Distortional buckling of I-steel concrete composite beams in negative moment area
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wangbao Zhou(Wuhan University of Technology); Shujin Li(Wuhan University of Technology); Zhi Huang(Central South University); Lizhong Jiang(Central South University)"
] |
The predominant type of buckling that I-steel concrete composite beams experience in the negative moment area is distortional buckling. The key factors that affect distortional buckling are the torsional and lateral restraints by the bottom flange. This study thoroughly investigates the equivalent lateral and torsional restraint stiffnesses of the bottom flange of an I-steel concrete composite beam under negative moments. The results show a coupling effect between the applied forces and the lateral and torsional restraint stiffnesses of the bottom flange. A formula is proposed to calculate the critical buckling stress of the I-steel concrete composite beams under negative moments by considering the lateral and torsional restraint stiffnesses of the bottom flange. The proposed method is shown to better predict the critical bending moment of the I-steel composite beams. This article introduces an improved method to calculate the elastic foundation beams, which takes into account the lateral and torsional restraint stiffnesses of the bottom flange and considers the coupling effect between them. The results show a close match in results from the calculation method proposed in this paper and the ANSYS finite element method, which validates the proposed calculation method. The proposed calculation method provides a theoretical basis for further research on distortional buckling and the ultimate resistance of I-steel concrete composite beams under a variable axial force.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.1.057
|
kci_detailed_000102.xml
|
||
ART002075658
|
oai_dc
|
Shear behavior and analytical model of perfobond connectors
|
Shear behavior and analytical model of perfobond connectors
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shuangjie Zheng(Tongji University); Yuqing Liu(Tongji University); Teruhiko Yoda(Waseda University); Weiwei Lin(Waseda University)"
] |
In steel and concrete composite girders, the load transfer between the steel beam and the concrete slab is commonly ensured by installing shear connectors. In this paper, to investigate the nonlinear behavior of perfobond connectors, a total of 60 push-out specimens were fabricated and tested with the variables for the hole diameter, the concrete strength, the thickness of concrete slab, the diameter, strength and existence of perforating rebar, the thickness, height and distance of perfobond ribs. The failure mode and the load-slip behavior of perfobond connectors were obtained. A theoretical model was put forward to express the load-slip relationship. Analytical formulas of shear capacity and peak slip were also proposed considering the interaction between the concrete dowel and the perforating rebar. The calculation results of the proposals agreed well with the experimental values.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.1.071
|
kci_detailed_000102.xml
|
||
ART002075659
|
oai_dc
|
Load-carrying capacity degradation of reinforced concrete piers due to corrosion of wrapped steel plates
|
Load-carrying capacity degradation of reinforced concrete piers due to corrosion of wrapped steel plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hanbin Ge(Meijo University); Shengbin Gao(Shanghai Jiao Tong University); Toyoki Ikai(Meijo University); Jie Ni(The IT Electronic 11th Design & Research)"
] |
Two-dimensional elastoplastic finite element formulation is employed to investigate the load- carrying capacity degradation of reinforced concrete piers wrapped with steel plates due to occurrence of corrosion at the pier base. By comparing with experimental results, the employed finite element analysis method is verified to be accurate. After that, a series of parametric studies are conducted to investigate the effect of corrosion ratio and corrosion mode of steel plates located near the base of in-service pier P2 on load-carrying capacity of the piers. It is observed that the load-carrying capacity of the piers decreases with the increase in corrosion ratio of steel plates. There exists an obvious linear relationship between the load-carrying capacity and the corrosion ratio in the case of even corrosion mode. The degradation of load-carrying capacity resulted from the web's uneven corrosion mode is more serious than that under even corrosion mode, and the former case is more liable to occur than the latter case in actual engineering application. Finally, the failure modes of the piers under different corrosion state are discussed. It is found that the principal tensile strain of concrete and yield range of steel plates are distributed within a wide range in the case of slight corrosion, and they are concentrated on the column base when complete corrosion occurs. The findings obtained from the present study can provide a useful reference for the maintenance and strengthening of the in-service piers.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.1.091
|
kci_detailed_000102.xml
|
||
ART002075660
|
oai_dc
|
Investigation of the link beam length of a coupled steel plate shear wall
|
Investigation of the link beam length of a coupled steel plate shear wall
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.B. Ghadaksaz(Semnan University); M. Gholhaki(Semnan University)"
] |
Steel shear wall system has been used in recent years in tall buildings due to its appropriate behavior advantages such as stiffness, high strength, economic feasibility and high energy absorption capability. Coupled steel plate shear walls consist of two steel shear walls that are connected to each other by steel link beam at each floor level. In this article the frames of 3, 10, and 15 of (C-SPSW) floor with rigid connection were considered in three different lengths of 1.25, 2.5 and 3.75 meters and link beams with plastic section modulus of 100% to the panel beam at each floor level and analyzed using three pairs of accelerograms based on nonlinear dynamic analysis through ABAQUS software and then the performance of walls and link beams at base shear, drift, the period of structure, degree of coupling (DC) and dissipated energy evaluated. The results show that the (C-SPSW) system base shear increases with a decrease in the link beam length, and the drift, main period and dissipated energy of structure decreases. Also the link beam length has different effects on parameters of coupling degrees.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.1.107
|
kci_detailed_000102.xml
|
||
ART002075661
|
oai_dc
|
Statistical calibration of safety factors for flexural stiffness of composite columns
|
Statistical calibration of safety factors for flexural stiffness of composite columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Farhad Aslani(The University of New South Wales); Ryan Lloyd(The University of New South Wales); Brian Uy(The University of New South Wales); Won-Hee Kang(Western Sydney University); Stephen Hicks(Heavy Engineering Research Association)"
] |
Composite column design is strongly influenced by the computation of the critical buckling load, which is very sensitive to the effective flexural stiffness (EI) of the column. Because of this, the behaviour of a composite column under lateral loading and its response to deflection is largely determined by the EI of the member. Thus, prediction models used for composite member design should accurately mirror this behaviour. However, EI varies due to several design parameters, and the implementation of high-strength materials, which are not considered by the current composite design codes of practice. The reliability of the design methods from six codes of practice (i.e., AS 5100, AS/NZS 2327, Eurocode 4, AISC 2010, ACI 318, and AIJ) for composite columns is studied in this paper. Also, the reliability of these codes of practice against a serviceability limit state criterion are estimated based on the combined use of the test-based statistical procedure proposed by Johnson and Huang (1997) and Monte Carlo simulations. The composite columns database includes 100 tests of circular concrete-filled tubes, rectangular concrete-filled tubes, and concrete-encased steel composite columns. A summary of the reliability analysis procedure and the evaluated reliability indices are provided. The reasons for the reliability analysis results are discussed to provide useful insight and supporting information for a possible revision of available codes of practice.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.1.127
|
kci_detailed_000102.xml
|
||
ART002075663
|
oai_dc
|
Numerical evaluation of deformation capacity of laced steel-concrete composite beams under monotonic loading
|
Numerical evaluation of deformation capacity of laced steel-concrete composite beams under monotonic loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Thirumalaiselvi(CSIR-Structural Engineering Research Centre); N. Anandavalli(CSIR-Structural Engineering Research Cen); J. Rajasankar(CSIR-Structural Engineering Research Cen); Nagesh R. Iyer(CSIR-Structural Engineering Research Centre)"
] |
This paper presents the details of Finite Element (FE) analysis carried out to determine the limiting deformation capacity and failure mode of Laced Steel-Concrete Composite (LSCC) beam, which was proposed and experimentally studied by the authors earlier (Anandavalli <i>et al</i>. 2012). The present study attains significance due to the fact that LSCC beam is found to possess very high deformation capacity at which range, the conventional laboratory experiments are not capable to perform. FE model combining solid, shell and link elements is adopted for modeling the beam geometry and compatible nonlinear material models are employed in the analysis. Besides these, an interface model is also included to appropriately account for the interaction between concrete and steel elements. As the study aims to quantify the limiting deformation capacity and failure mode of the beam, a suitable damage model is made use of in the analysis. The FE model and results of nonlinear static analysis are validated by comparing with the load-deformation response available from experiment. After validation, the analysis is continued to establish the limiting deformation capacity of the beam, which is assumed to synchronise with tensile strain in bottom cover plate reaching the corresponding ultimate value. The results so found indicate about 20° support rotation for LSCC beam with 45° lacing. Results of parametric study indicate that the limiting capacity of the LSCC beam is more influenced by the lacing angle and thickness of the cover plate.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.1.167
|
kci_detailed_000102.xml
|
||
ART002075664
|
oai_dc
|
Performance of shear connectors at elevated temperatures − A review
|
Performance of shear connectors at elevated temperatures − A review
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.E.M. Shahabi(University of Malaya); N.H. Ramli Sulong(University of Malaya); M. Shariati(University of Malaya); S.N.R. Shah(University of Malaya)"
] |
Shear connectors are key components to ensure the efficient composite action and satisfactory transfer of shear forces at the steel–concrete interface in composite beams. Under hazardous circumstances, such as fire in a building, the performance of a composite beam significantly relies on the performance of shear connectors. Studies on the behavior of shear connectors subjected to elevated temperatures performed in the last decade are reviewed in this paper. The experimental testing of push-out specimens, the design approaches provided by researchers and different codes, the major failure modes, and the finite element modeling of shear connectors are highlighted. The critical research review showed that the strength of a shear connector decreases proportionally with the increase in temperature. Compared with the volume of work published on shear connectors at ambient temperatures, a few studies on the behavior of shear connectors under fire have been conducted. Several areas where additional research is needed are also identified in this paper.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.1.185
|
kci_detailed_000102.xml
|
||
ART002075665
|
oai_dc
|
Deflection and vibration analysis of higher-order shear deformable compositionally graded porous plate
|
Deflection and vibration analysis of higher-order shear deformable compositionally graded porous plate
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Farzad Ebrahimi(Imam Khomeini International University); Sajjad Habibi(Imam Khomeini International University)"
] |
In this study the finite element method is utilized to predict the deflection and vibration characteristics of rectangular plates made of saturated porous functionally graded materials (PFGM) within the framework of the third order shear deformation plate theory. Material properties of PFGM plate are supposed to vary continuously along the thickness direction according to the power-law form and the porous plate is assumed of the form where pores are saturated with fluid. Various edge conditions of the plate are analyzed. The governing equations of motion are derived through energy method, using calculus of variations while the finite element model is derived based on the constitutive equation of the porous material. According to the numerical results, it is revealed that the proposed modeling and finite element approach can provide accurate deflection and frequency results of the PFGM plates as compared to the previously published results in literature. The detailed mathematical derivations are presented and numerical investigations are performed while the emphasis is placed on investigating the effect of the several parameters such as porosity volume fraction, material distribution profile, mode number and boundary conditions on the natural frequencies and deflection of the PFGM plates in detail. It is explicitly shown that the deflection and vibration behaviour of porous FGM plates are significantly influenced by these effects. Numerical results are presented to serve as benchmarks for future analyses of FGM plates with porosity phases.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.1.205
|
kci_detailed_000102.xml
|
||
ART002078946
|
oai_dc
|
Bolted T-stubs: A refined model for flange and bolt fracture modes
|
Bolted T-stubs: A refined model for flange and bolt fracture modes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Antonella B. Francavilla(Salerno University); Massimo Latour(Salerno University); Vincenzo Piluso(Salerno University); Gianvittorio Rizzano(Salerno University)"
] |
It is well known that, in order to accurately predict the behaviour of steel structures a requirement the definition of the mechanical behaviour of beam-to column joints is of primary importance. This goal can be achieved by means of the so-called component method, which, in order to obtain the whole behaviour of connections, provides to break up joints in basic components of deformability and resistance. One of the main joint components used to model bolted connections is the so-called equivalent T-stub in tension, which is normally used to predict the behaviour of bolted plates in bending starting from the behaviour of the single bolt rows. In past decades, significant research efforts have been devoted to the prediction of the behaviour of bolted T-stubs but, to date, no particular attention has been devoted to the characterization of their plastic deformation capacity. To this scope, the work presented in this paper, taking into account the existing technical literature, proposes a new theoretical model for predicting the whole behaviour up to failure of bolted T-stubs under monotonic loading conditions, including some complexities, such as the bolt/plate compatibility requirement and the bolt fracture, which are necessary to accurately evaluate the ultimate displacement. After presenting the advances of the proposed approach, a comparison between theoretical and experimental results is provided in order to verify its accuracy.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.2.267
|
kci_detailed_000102.xml
|
||
ART002078947
|
oai_dc
|
Axial compression ratio limit values for steel reinforced concrete (SRC) special shaped columns
|
Axial compression ratio limit values for steel reinforced concrete (SRC) special shaped columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zongping Chen(Guangxi University); Jinjun Xu(Guangxi University); Yuliang Chen(Guangxi University); Jianyang Xue(Guangxi University)"
] |
This paper presents the results of experimental investigation, numerical calculation and theoretical analysis on axial compression ratio limit values for steel reinforced concrete (SRC) special shaped columns. 17 specimens were firstly intensively carried out to investigate the hysteretic behavior of SRC special shaped columns subjected to a constant axial load and cyclic reversed loads. Two theories were used to calculate the limits of axial compression ratio for all the specimens, including the balanced failure theory and superposition theory. It was found that the results of balanced failure theory by numerical integration method cannot conform the reality of test results, while the calculation results by employing the superposition theory can agree well with the test results. On the basis of superposition theory, the design limit values of axial compression ratio under different seismic grades were proposed for SRC special shaped columns.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.2.295
|
kci_detailed_000102.xml
|
||
ART002078948
|
oai_dc
|
Effects of uncertainties on seismic behaviour of optimum designed braced steel frames
|
Effects of uncertainties on seismic behaviour of optimum designed braced steel frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Iman Hajirasouliha(The University of Sheffield); Kypros Pilakoutas(The University of Sheffield); Reza K. Mohammadi(K.N. Toosi University of Technology)"
] |
Concentrically braced steel frames (CBFs) can be optimised during the seismic design process by using lateral loading distributions derived from the concept of uniform damage distribution. However, it is not known how such structures are affected by uncertainties. This study aims to quantify and manage the effects of structural and ground-motion uncertainty on the seismic performance of optimum and conventionally designed CBFs. Extensive nonlinear dynamic analyses are performed on 5, 10 and 15-storey frames to investigate the effects of storey shearstrength and damping ratio uncertainties by using the Monte Carlo simulation method. For typical uncertainties in conventional steel frames, optimum design frames always exhibit considerably less inter-storey drift and cumulative damage compared to frames designed based on IBC-2012. However, it is noted that optimum structures are in general more sensitive to the random variation of storey shear-strength. It is shown that up to 50% variation in damping ratio does not affect the seismic performance of the optimum design frames compared to their code-based counterparts. Finally, the results indicate that the ground-motion uncertainty can be efficiently managed by optimizing CBFs based on the average of a set of synthetic earthquakes representing a design spectrum. Compared to code-based design structures, CBFs designed with the proposed average patterns exhibit up to 54% less maximum inter-storey drift and 73% less cumulative damage under design earthquakes. It is concluded that the optimisation procedure presented is reliable and should improve the seismic performance of CBFs.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.2.317
|
kci_detailed_000102.xml
|
||
ART002078949
|
oai_dc
|
Performance based evaluation of RC coupled shear wall system with steel coupling beam
|
Performance based evaluation of RC coupled shear wall system with steel coupling beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Habib Akbarzadeh Bengar(University of Mazandaran); Roja Mohammadalipour Aski(Shomal University)"
] |
Steel coupling beam in reinforced concrete (RC) coupled shear wall system is a proper substitute for deep concrete coupling beam. Previous studies have shown that RC coupled walls with steel or concrete coupling beam designed with strength-based design approach, may not guarantee a ductile behavior of a coupled shear wall system. Therefore, seismic performance evaluation of RC coupled shear wall with steel or concrete coupling beam designed based on a strength-based design approach is essential. In this paper first, buildings with 7, 14 and 21 stories containing RC coupled shear wall system with concrete and steel coupling beams were designed with strength-based design approach, then performance level of these buildings were evaluated under two spectrum; Design Basis Earthquake (DBE) and Maximum Considered Earthquake (MCE). The performance level of LS and CP of all buildings were satisfied under DBE and MCE respectively. In spite of the steel coupling beam, concrete coupling beam in RC coupled shear wall acts like a fuse under strong ground motion.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.2.337
|
kci_detailed_000102.xml
|
||
ART002078950
|
oai_dc
|
Design guides to resist progressive collapse for steel structures
|
Design guides to resist progressive collapse for steel structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Mirtaheri(K.N. Toosi University of Technology); M. Abbasi Zoghi(K.N. Toosi University of Technology)"
] |
The progressive collapse phenomenon in structures has been interested by civil engineers and the building standards organizations. This is particularly true for the tall and special buildings ever since local collapse of the Ronan Point tower in UK in 1968. When initial or secondary defects of main load carrying elements, overloads or unpredicted loads occur in the structure, a local collapse may be arise that could be distributed through entire structure and cause global collapse. One is not able to prevent the reason of failure as well as the prevention of propagation of the collapse. Also, one is not able to predict the start point of collapse. Therefore we should generalize design guides to whole or the part of structure based on the risk analysis and use of load carrying elements removal scenario. There are some new guides and criteria for elements and connections to be designed to resist progressive collapse. In this paper, codes and recommendations by various researchers are presented, classified and compared for steel structures. Two current design methods are described in this paper and some retrofitting methods are summarized. Finally a steel building with special moment resistant frame is analyzed as a case study based on two standards guidelines. This includes consideration of codes recommendations. It is shown that progressive collapse potential of the building depends on the removal scenario selection and type of analysis. Different results are obtained based on two guidelines.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.2.357
|
kci_detailed_000102.xml
|
||
ART002078951
|
oai_dc
|
Long-term structural analysis and stability assessment of three-pinned CFST arches accounting for geometric nonlinearity
|
Long-term structural analysis and stability assessment of three-pinned CFST arches accounting for geometric nonlinearity
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kai Luo(University of New South Wales); Yong-Lin Pi(University of New South Wales); Wei Gao(University of New South Wales); Mark A.Bradford(University of New South Wales)"
] |
Due to creep and shrinkage of the concrete core, concrete-filled steel tubular (CFST) arches continue to deform in the long-term under sustained loads. This paper presents analytical investigations of the effects of geometric nonlinearity on the long-term in-plane structural performance and stability of three-pinned CFST circular arches under a sustained uniform radial load. Non-linear long-term analysis is conducted and compared with its linear counterpart. It is found that the linear analysis predicts long-term increases of deformations of the CFST arches, but does not predict any long-term changes of the internal actions. However, non-linear analysis predicts not only more significant long-term increases of deformations, but also significant long-term increases of internal actions under the same sustained load. As a result, a three-pinned CFST arch satisfying the serviceability limit state predicted by the linear analysis may violate the serviceability requirement when its geometric nonlinearity is considered. It is also shown that the geometric nonlinearity greatly reduces the long-term in-plane stability of three-pinned CFST arches under the sustained load. A three-pinned CFST arch satisfying the stability limit state predicted by linear analysis in the long-term may lose its stability because of its geometric nonlinearity. Hence, non-linear analysis is needed for correctly predicting the long-term structural behaviour and stability of three-pinned CFST arches under the sustained load. The non-linear long-term behaviour and stability of three-pinned CFST arches are compared with those of twopinned counterparts. The linear and non-linear analyses for the long-term behaviour and stability are validated by the finite element method.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.2.379
|
kci_detailed_000102.xml
|
||
ART002078952
|
oai_dc
|
An evaluation of the seismic response of symmetric steel space buildings
|
An evaluation of the seismic response of symmetric steel space buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Burak Yön(Dicle University)"
] |
This paper evaluates the seismic response of three dimensional steel space buildings using the spread plastic hinge approach. A numerical study was carried out in which a sample steel space building was selected for pushover analysis and incremental nonlinear dynamic time history analysis. For the nonlinear analysis, three earthquake acceleration records were selected to ensure compatibility with the design spectrum defined in the Turkish Earthquake Code. The interstorey drift, capacity curve, maximum responses and dynamic pushover curves of the building were obtained. The analysis results were compared and good correlation was obtained between the idealized dynamic analyses envelopes with and static pushover curves for the selected building. As a result to more accurately account response of steel buildings, dynamic pushover envelopes can be obtained and compared with static pushover curve of the building.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.2.399
|
kci_detailed_000102.xml
|
||
ART002078953
|
oai_dc
|
Analyze of the interfacial stress in reinforced concrete beams strengthened with externally bonded CFRP plate
|
Analyze of the interfacial stress in reinforced concrete beams strengthened with externally bonded CFRP plate
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lazreg Hadji(Université Ibn Khaldoun); T. Hassaine Daouadji(Université Ibn Khaldoun); M. Ait Amar Meziane(Université Ibn Khaldoun); E. A. Adda Bedia(Université de Sidi Bel Abbes)"
] |
A theoretical method to predict the interfacial stresses in the adhesive layer of reinforced concrete beams strengthened with externally bonded carbon fiber-reinforced polymer (CFRP) plate is presented. The analysis provides efficient calculations for both shear and normal interfacial stresses in reinforced concrete beams strengthened with composite plates, and accounts for various effects of Poisson's ratio and Young's modulus of adhesive. Such interfacial stresses play a fundamental role in the mechanics of plated beams, because they can produce a sudden and premature failure. The analysis is based on equilibrium and deformations compatibility approach developed by Tounsi. In the present theoretical analysis, the adherend shear deformations are taken into account by assuming a parabolic shear stress through the thickness of both the reinforced concrete beam and bonded plate. The paper is concluded with a summary and recommendations for the design of the strengthened beam.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.2.413
|
kci_detailed_000102.xml
|
||
ART002078954
|
oai_dc
|
Pseudo-dynamic test of the steel frame - Shear wall with prefabricated floor structure
|
Pseudo-dynamic test of the steel frame - Shear wall with prefabricated floor structure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Qingning Li(Xi’an University of Architecture and Technology); Chun Han(Xi’an University of Architecture and Tec); Weishan Jiang(Xi’an University of Architecture and Tec); Junhong Yin(Xi’an University of Architecture and Tec); Lei Yan(Xi’an University of Architecture and Tec)"
] |
Seismic behavior of new composite structural system with a fabricated floor was studied. A two-bay and three-story structural model with the scale ratio of 1/4 was consequently designed. Based on the proposed model, multiple factors including energy dissipation capacity, stiffness degradation and deformation performance were analyzed through equivalent single degree of freedom pseudo-dynamic test with different earthquake levels. The results show that, structural integrity as well as the effective transmission of the horizontal force can be ensured by additional X bracing at the bottom of the rigidity of the floor without concrete topping. It is proved that the cast-in-place floor in areas with high seismic intensity can be replaced by the prefabricated floor without pouring surface layer. The results provide a reliable theoretical basis for the seismic design of the similar structural systems in engineering application.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.2.431
|
kci_detailed_000102.xml
|
||
ART002078955
|
oai_dc
|
Structural behavior of non-symmetrical steel cable-stayed bridges
|
Structural behavior of non-symmetrical steel cable-stayed bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Juan J. Jorquera-Lucerga(Polytechnic University of Cartagena); Jose A. Lozano-Galant(University of Castilla-La Mancha); Jose Turmo(Universitat Politècnica de Catalunya)"
] |
Despite of the growing number of built examples, the analysis of non-symmetrical cable-stayed bridges has not received considerable attention from the researchers. In fact, the effects of the main design parameters in the structural behavior of these bridges are not addressed in detail in the literature. To fill this gap, this paper studies the structural response of a number of non-symmetrical cable-stayed bridges. With this aim, a parametric analysis is performed to evaluate the effect of each of the main design parameters (the ratio between the main and the back span length, the pylon, the deck and backstay stiffnesses, the pylon inclination, and the stay configuration) of this kind of bridges. Furthermore, the role of the geometrical nonlinearity and the steel consumption in stays are evaluated.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.2.447
|
kci_detailed_000102.xml
|
||
ART002078944
|
oai_dc
|
A nonlocal zeroth-order shear deformation theory for free vibration of functionally graded nanoscale plates resting on elastic foundation
|
A nonlocal zeroth-order shear deformation theory for free vibration of functionally graded nanoscale plates resting on elastic foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abdelouahed Tounsi(University of Sidi Bel Abbes); Fatima Bounouara(University of Sidi Bel Abbes); Kouider Halim Benrahou(University of Sidi Bel Abbes); Ismahene Belkorissat(University of Sidi Bel Abbes)"
] |
The objective of this work is to present a zeroth-order shear deformation theory for free vibration analysis of functionally graded (FG) nanoscale plates resting on elastic foundation. The model takes into consideration the influences of small scale and the parabolic variation of the transverse shear strains across the thickness of the nanoscale plate and thus, it avoids the employ use of shear correction factors. Also, in this present theory, the effect of transverse shear deformation is included in the axial displacements by using the shear forces instead of rotational displacements as in available high order plate theories. The material properties are supposed to be graded only in the thickness direction and the effective properties for the FG nanoscale plate are calculated by considering Mori-Tanaka homogenization scheme. The equations of motion are obtained using the nonlocal differential constitutive expressions of Eringen in conjunction with the zeroth-order shear deformation theory via Hamilton's principle. Numerical results for vibration of FG nanoscale plates resting on elastic foundations are presented and compared with the existing solutions. The influences of small scale, shear deformation, gradient index, Winkler modulus parameter and Pasternak shear modulus parameter on the vibration responses of the FG nanoscale plates are investigated.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.2.227
|
kci_detailed_000102.xml
|
||
ART002078945
|
oai_dc
|
Effect of local small diameter stud connectors on behavior of partially encased composite beams
|
Effect of local small diameter stud connectors on behavior of partially encased composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Josef Machacek(Czech Technical University in Prague); Giang Bergerova Nguyen(Czech Technical University in Prague)"
] |
The paper combines two distinct parts. First the behavior of welded headed studs with small diameters of 10 and 13 mm acting as shear connectors (which are not embraced in current standards) is studied. Based on standard push tests the load-slip relationships and strengths are evaluated. While the current standard (Eurocode 4 and AISC) formulas used for such studs give reasonable but too conservative strengths, less conservative and full loadslip rigidities are evaluated and recommended for a subsequent investigation or design. In the second part of the paper the partially encased beams under bending are analyzed. Following former experiments showing rather indistinct role of studs used for shear connection in such beams their role is studied. Numerical model employing ANSYS software is presented and validated using former experimental data. Subsequent parametric studies investigate the longitudinal shear between steel and concrete parts of the beams with respect to friction at the steel and concrete interface and contribution of studs with small diameters required predominantly for assembly stages (concreting). Substantial influence of the friction and effect of concrete confinement was observed with rather less noticeable contribution of the studs. Distribution of the longitudinal shear and its sharing between friction and studs is presented with concluding remarks.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.2.251
|
kci_detailed_000102.xml
|
||
ART001931254
|
oai_dc
|
Optimum design of multi-span composite box girder bridges using Cuckoo Search algorithm
|
Optimum design of multi-span composite box girder bridges using Cuckoo Search algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Kaveh(Iran University of Science and Technology); T. Bakhshpoori(Iran University of Science and Technolog); M. Barkhori(Iran University of Science and Technology)"
] |
Composite steel-concrete box girders are frequently used in bridge construction for their economic and structural advantages. An integrated metaheuristic based optimization procedure is proposed for discrete size optimization of straight multi-span steel box girders with the objective of minimizing the self-weight of girder. The metaheuristic algorithm of choice is the Cuckoo Search (CS) algorithm. The optimum design of a box girder is characterized by geometry, serviceability and ultimate limit states specified by the American Association of State Highway and Transportation Officials (AASHTO). Size optimization of a practical design example investigates the efficiency of this optimization approach and leads to around 15% of saving in material.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.5.705
|
kci_detailed_000102.xml
|
||
ART001931255
|
oai_dc
|
Study of complex nonlinear vibrations by means of accurate analytical approach
|
Study of complex nonlinear vibrations by means of accurate analytical approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mahmoud Bayat(Islamic Azad University); Iman Pakar(Islamic Azad University); Mahdi Bayat(Islamic Azad University)"
] |
In the current study, we consider a new class of analytical periodic solution for free nonlinear vibration of mechanical systems. Hamiltonian approach is applied to analyze nonlinear problems which occur in dynamics. The proposed method doesn't have the limitations of the classical methods and leads us to a high accurate solution by only one iteration. Two well known examples are studied to show the convenience and effectiveness of this approach. Runge-Kutta's algorithm is also applied and the results of it are compared with the Hamiltonian approach. High accuracy of the proposed approach reveals that the Hamiltonian approach can be very useful for other nonlinear practical problems in engineering.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.5.721
|
kci_detailed_000102.xml
|
||
ART001931256
|
oai_dc
|
Behavior of gusset plate-T0-CCFT connections with different configurations
|
Behavior of gusset plate-T0-CCFT connections with different configurations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.M. Hassan(Cairo University); H.M. Ramadan(Cairo University); M. Naeem(Cairo University); S.A. Mourad(Cairo University)"
] |
Concrete-filled steel tube (CFT) composite columns, either circular (CCFT) or rectangular (RCFT), have many economical and aesthetic advantages but the behavior of their connections are complicated. This study aims to investigate, through an experimental program, the performance and behavior of different connections configurations between circular concrete filled steel tube columns (CCFT) and gusset plates subjected to shear and axial compression loadings. The study included seventeen connection subassemblies consisting of a fixed length steel tube and gusset plate connected to the tube end with different details tested under half cyclic loading. A notable effect was observed on the behavior of the connections due to its detailing changes with respect to capacity, failure mode, ductility, and stress distribution.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.5.735
|
kci_detailed_000102.xml
|
||
ART001931257
|
oai_dc
|
Analytical study on post-buckling and nonlinear free vibration analysis of FG beams resting on nonlinear elastic foundation under thermo-mechanical loadings using VIM
|
Analytical study on post-buckling and nonlinear free vibration analysis of FG beams resting on nonlinear elastic foundation under thermo-mechanical loadings using VIM
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hessameddin Yaghoobi(Semnan University); Mohammad Sadegh Valipour(Semnan University); Abdolhossein Fereidoon(Semnan University); Pooria Khoshnevisrad(Amirkabir University of Technology)"
] |
In this paper, nonlinear vibration and post-buckling analysis of beams made of functionally graded materials (FGMs) resting on nonlinear elastic foundation subjected to thermo-mechanical loading are studied. The thermo-mechanical material properties of the beams are assumed to be graded in the thickness direction according to a simple power law distribution in terms of the volume fractions of the constituents, and to be temperature-dependent. The assumption of a small strain, moderate deformation is used. Based on Euler-Bernoulli beam theory and von-Karman geometric nonlinearity, the integral partial differential equation of motion is derived. Then this PDE problem which has quadratic and cubic nonlinearities is simplified into an ODE problem by using the Galerkin method. Finally, the governing equation is solved analytically using the variational iteration method (VIM). Some new results for the nonlinear natural frequencies and buckling load of the FG beams such as the influences of thermal effect, the effect of vibration amplitude, elastic coefficients of foundation, axial force, end supports and material inhomogenity are presented for future references. Results show that the thermal loading has a significant effect on the vibration and post-buckling response of FG beams.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.5.753
|
kci_detailed_000102.xml
|
||
ART001931246
|
oai_dc
|
Mechanical testing of the behavior of steel 1.7147 at different temperatures
|
Mechanical testing of the behavior of steel 1.7147 at different temperatures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Josip Brnic(University of Rijeka); Goran Turkalj(University of Rijeka); Marko Canadija(University of Rijeka)"
] |
The paper provides the test results and analysis on the behavior of steel 1.7147 at different temperatures. Mechanical uniaxial tests were used to determine mechanical properties, resistance to creep and Charpy impact tests to determine impact energy. Test results are presented in the form of engineering stress-strain diagrams, creep curves as well as numerical data related to impact energy. The results show that the tensile strength has the highest value at room temperature, and the same goes for the yield strength as well as for modulus of elasticity. After room temperature both of mentioned properties decrease with temperature increasing. Some of creep curves were modeled using rheological models and analytical equation. Based on Charpy impact energy an assessment of fracture toughness was made.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.5.549
|
kci_detailed_000102.xml
|
||
ART001931247
|
oai_dc
|
Scattering analysis of curved FSS using Floquet harmonics and asymptotic waveform evaluation technique
|
Scattering analysis of curved FSS using Floquet harmonics and asymptotic waveform evaluation technique
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"정이루(연세대학교); 홍익표(공주대학교); 전흥재(연세대학교); 박용배(아주대학교); 김연재(Agency for Defense and Development); 육종관(연세대학교)"
] |
In this paper, we present the scattering characteristics of infinite and finite array using method of moment (MoM) with Floquet harmonics and asymptotic waveform evaluation (AWE) technique. First, infinite cylindrical dipole array is analyzed using the MoM with entire domain basis function and cylindrical Floquet harmonics. To provide the validity of results, we fabricated the cylindrical dipole array and measured the transmission characteristics. The results show good agreements. Second, we analyzed the scattering characteristics of finite array. A large simulation time is needed to obtain the scattering characteristics of finite array over wide frequency range because Floquet harmonics cant be applied. So, we used the MoM with AWE technique using Taylor series and Pade approximation to overcome the shortcomings of conventional MoM. We calculated the radar cross section (RCS) as scattering characteristics using the proposed method in this paper and the conventional MoM for finite planar slot array, finite spherical slot array, and finite cylindrical dipole array, respectively. The compared results agree well and show that the proposed method in this paper is good for electromagnetic analysis of finite FSS.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.5.561
|
kci_detailed_000102.xml
|
||
ART001931248
|
oai_dc
|
Investigation of a new steel-concrete connection for composite bridges
|
Investigation of a new steel-concrete connection for composite bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Dimitrios Papastergiou(DIC s.a. ingénieurs, Aigle); Jean-Paul Lebet(Steel Structures Laboratory, EPFL École Polytechnique Fédérale de Lausanne)"
] |
A new type of connection for steel-concrete composite bridges was developed by the Steel Structures Laboratory of Ecole Poytechinque Fédérale de Lausanne. Resistance to longitudinal shear is based on the development of shear stresses in the confined interfaces which form the connection. Confinement is provided by the reinforced concrete slab which encloses the connection and restrains the uplift (lateral separation) of the interfaces by developing normal stresses. The experimental investigation of the interfaces, under static and cyclic loading, enabled the development of the laws describing the structural behaviour of each interface. Those laws were presented by the authors in previous papers. The current paper focuses on the continuity of the research. It presents the experimental investigation on the new connection by means of push-out tests on specimens submitted to static and cyclic shear loading. Investigation revealed that the damage in the connection, due to cyclic loading, is expressed by the accumulation of a residual slip. A safe fatigue failure criterion is proposed for the connection which enabled the verification of the connection for the fatigue limit state with respect to the limit of fatigue. A numerical model is developed which takes into account the laws describing the interface behaviour and the analytical expressions for the confinement effect, the latter obtained by performing finite element analysis. This numerical model predicts the shear resistance of the connection and enables to assess its fatigue limit which is necessary for the fatigue design proposed.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.5.573
|
kci_detailed_000102.xml
|
||
ART001931249
|
oai_dc
|
Effect of tapered-end shape of FRP sheets on stress concentration in strengthened beams under thermal load
|
Effect of tapered-end shape of FRP sheets on stress concentration in strengthened beams under thermal load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Benaoumeur El Mahi(University of Sidi Bel Abbes); Kouider Halim Benrahou(University of Sidi Bel Abbes); Sofiane Amziane(Clermont University); Khalil Belakhdar(University of Sidi Bel Abbes); Abdelouahed Tounsi(University of Sidi Bel Abbes); El Abbes Adda Bedia(University of Sidi Bel Abbes)"
] |
Repairing and strengthening structural members by bonding composite materials have received a considerable attention in recent years. The major problem when using bonded FRP or steel plates to strengthen existing structures is the high interfacial stresses that may be built up near the plate ends which lead to premature failure of the structure. As a result, many researchers have developed several analytical methods to predict the interface performance of bonded repairs under various types of loading. In this paper, a numerical solution using finite . difference method (FDM) is used to calculate the interfacial stress distribution in beams strengthened with FRP plate having a tapered ends under thermal loading. Different thinning profiles are investigated since the later can significantly reduce the stress concentration. In the present theoretical analysis, the adherend shear deformations are taken into account by assuming a parabolic shear stress through the thickness of both beam and bonded plate. The shear correction factor for I-section beams is also included in the solution. Numerical results from the present analysis are presented to demonstrate the advantages of use the tapers in design of strengthened beams.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.5.601
|
kci_detailed_000102.xml
|
||
ART001931250
|
oai_dc
|
Prediction of shear capacity of channel shear connectors using the ANFIS model
|
Prediction of shear capacity of channel shear connectors using the ANFIS model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali Toghroli(University of Malaya); Mohammad Mohammadhassani(University of Malaya); Meldi Suhatril(University of Malaya); Mahdi shariati(University of Malaya); Zainah Ibrahim(University of Malaya)"
] |
Due to recent advancements in the area of Artificial Intelligence (AI) and computational intelligence, the application of these technologies in the construction industry and structural analysis has been made feasible. With the use of the Adaptive-Network-based Fuzzy Inference System (ANFIS) as a modelling tool, this study aims at predicting the shear strength of channel shear connectors in steel concrete composite beam. A total of 1200 experimental data was collected, with the input data being achieved based on the results of the push-out test and the output data being the corresponding shear strength which were recorded at all loading stages. The results derived from the use of ANFIS and the classical linear regressions (LR) were then compared. The outcome shows that the use of ANFIS produces highly accurate, precise and satisfactory results as opposed to the LR.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.5.623
|
kci_detailed_000102.xml
|
||
ART001931251
|
oai_dc
|
Analytical solutions for bending of transversely or axially FG nonlocal beams
|
Analytical solutions for bending of transversely or axially FG nonlocal beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ngoc-Tuan Nguyen(Sejong University); 김남일(세종대학교); 이재홍(세종대학교)"
] |
This paper presents the analytical solutions for the size-dependent static analysis of the functionally graded (FG) beams with various boundary conditions based on the nonlocal continuum model. The nonlocal behavior is described by the differential constitutive model of Eringen, which enables to this model to become effective in the analysis and design of nanostructures. The elastic modulus of beam is assumed to vary through the thickness or longitudinal directions according to the power law. The governing equations are derived by using the nonlocal continuum theory incorporated with Euler-Bernoulli beam theory. The explicit solutions are derived for the static behavior of the transversely or axially FG beams with various boundary conditions. The verification of the model is obtained by comparing the current results with previously published works and a good agreement is observed. Numerical results are presented to show the significance of the nonlocal effect, the material distribution profile, the boundary conditions, and the length of beams on the bending behavior of nonlocal FG beams.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.5.639
|
kci_detailed_000102.xml
|
||
ART001931252
|
oai_dc
|
Experiments on the bearing capacity of tapered concrete filled double skin steel tubular (CFDST) stub columns
|
Experiments on the bearing capacity of tapered concrete filled double skin steel tubular (CFDST) stub columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Qing-Xin Ren(Shenyang Jianzhu University); Chao Hou(Tsinghua University); Dennis Lam(University of Bradford); Lin-Hai Han(Tsinghua University)"
] |
Tapered concrete filled double skin steel tubular (CFDST) columns have been used in China for structures such as electricity transmission towers. In practice, the bearing capacity related to the connection details on the top of the column is not fully understood. In this paper, the experimental behaviour of tapered CFDST stub columns subjected to axial partial compression is reported, sixteen specimens with top endplate and ten specimens without top endplate were tested. The test parameters included: (1) tapered angle, (2) top endplate thickness, and (3) partial compression area ratio. Test results show that the tapered CFDST stub columns under axial partial compression behaved in a ductile manner. The axial partial compressive behaviour and the failure modes of the tapered CFDST stub columns were significantly influenced by the parameters investigated. Finally, a simple formula for predicting the cross-sectional capacity of the tapered CFDST sections under axial partial compression is proposed.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.5.667
|
kci_detailed_000102.xml
|
||
ART001931253
|
oai_dc
|
Effect of post weld treatment on cracking behaviors of beam-column connections in steel bridge piers
|
Effect of post weld treatment on cracking behaviors of beam-column connections in steel bridge piers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Liang-Jiu Jia(Meijo University); Hanbin Ge(Meijo University); Toshimitsu Suzuki(Mitubishi Heavy Industries, Ltd.)"
] |
A great number of moment-resisting steel structures collapsed due to ductile crack initiation at welded beam-column connections, followed by explosive brittle fracture in the Kobe (Hyogoken-Nanbu) earthquake in 1995. A series of experimental and numerical studies on cracking behaviors of beam-column connections in steel bridge piers were carried out by the authors’ team. This paper aims to study the effect of post weld treatment on cracking behaviors of the connections during a strong earthquake event. Experiments of three specimens with different weld finishes, i.e., as-welded, R-finish, and burr grinding, were conducted. The experimental results indicate that the instants of ductile crack initiation are greatly delayed for the specimens with R-finish and burr grinding finishes compared with the as-welded one. The strain concentration effect in the connection is also greatly reduced in the specimens with post weld treatment compared with the as-welded one, which was also verified in the tests.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.5.687
|
kci_detailed_000102.xml
|
||
ART002085136
|
oai_dc
|
Bond between FRP formworks and concrete-effect of surface treatments and adhesives
|
Bond between FRP formworks and concrete-effect of surface treatments and adhesives
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abhijit Mukherjee(Curtin University); Reema Goyal(Thapar University); Shweta Goyal(Thapar University)"
] |
FRP stay-in-place (SIP) formworks are designed as a support for casting concrete and as a tension reinforcement when concrete is cured. Bond development between SIP formwork and concrete is critical for FRP tension element to be effective. This paper reports the bond strength between FRP formwork and concrete for different interfacial treatments. A novel experimental setup is prepared for observing the bond behaviour. Three different adhesives with varying workability have been investigated. Along with the load-deformation characteristics, bond slip and strains in the formwork have been measured. A finite element numerical simulation was conducted for the experiments to understand the underlying mechanism. The results show that the adhesive bonding has the best bond strength.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.3.671
|
kci_detailed_000102.xml
|
||
ART002085137
|
oai_dc
|
Iterative global-local procedure for the analysis of thin-walled composite laminates
|
Iterative global-local procedure for the analysis of thin-walled composite laminates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R. Emre Erkmen(University of Technology Sydney); Ashkan Afnani(University of Technology Sydney)"
] |
This paper presents a finite element procedure based on Bridging multi-scale method (BMM) in order to incorporate the effect of local/cross-sectional deformations (e.g., flange local buckling and web crippling) on the global behaviour of thin-walled members made of fibre-reinforced polymer composite laminates. This method allows the application of local shell elements in critical regions of an existing beam-type model. Therefore, it obviates the need for using computationally expensive shell elements in the whole domain of the structure, which is otherwise necessary to capture the effect of the localized behaviour. Consequently, highly accurate analysis results can be achieved with this method by using significantly smaller finite element model, compared to the existing methods. The proposed method can be used for composite polymer laminates with arbitrary fibre orientation directions in different layers of the material, and under various loading conditions. Comparison with full shell-type finite element analysis results are made in order to illustrate the efficiency and accuracy of the proposed technique.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.3.693
|
kci_detailed_000102.xml
|
||
ART002085138
|
oai_dc
|
Analysis of seismic behavior of composite frame structures
|
Analysis of seismic behavior of composite frame structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Huiling Zhao(Shanghai University)"
] |
There are great needs of simple but reliable mechanical nonlinear behavior analysis and performance evaluation method for frames constructed by steel and concrete composite beams or columns when the structures subjected extreme loads, such as earthquake loads. This paper describes an approach of simplified macro-modelling for composite frames consisting of steel-concrete composite beams and CFST columns, and presents the performance evaluation procedure based on the pushover nonlinear analysis results. A four-story two-bay composite frame underground is selected as a study case. The establishment of the macro-model of the composite frame is guided by the characterization of nonlinear behaviors of composite structural members. Pushover analysis is conducted to obtain the lateral force versus top displacement curve of the overall structure. The identification method of damage degree of composite frames has been proposed. The damage evolution and development of this composite frame in case study has been analyzed. The failure mode of this composite frame is estimated as that the bottom CFST columns damage substantially resulting in the failure of the bottom story. Finally, the seismic performance of the composite frame with high strength steel is analyzed and compared with the frame with ordinary strength steel, and the result shows that the employment of high strength steel in the steel tube of CFST columns and steel beam of composite beams benefits the lateral resistance and elasticity resuming performance of composite frames.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.3.719
|
kci_detailed_000102.xml
|
||
ART002085134
|
oai_dc
|
Using an equivalent continuum model for 3D dynamic analysis of nanocomposite plates
|
Using an equivalent continuum model for 3D dynamic analysis of nanocomposite plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vahid Tahouneh(Islamic Azad University)"
] |
Most of the early studies on plates vibration are focused on two-dimensional theories, these theories reduce the dimensions of problems from three to two by introducing some assumptions in mathematical modeling leading to simpler expressions and derivation of solutions. However, these simplifications inherently bring errors and therefore may lead to unreliable results for relatively thick plates. The main objective of this research paper is to present 3-D elasticity solution for free vibration analysis of continuously graded carbon nanotube-reinforced (CGCNTR) rectangular plates resting on two-parameter elastic foundations. The volume fractions of oriented, straight single-walled carbon nanotubes (SWCNTs) are assumed to be graded in the thickness direction. In this study, an equivalent continuum model based on the Eshelby-Mori-Tanaka approach is employed to estimate the effective constitutive law of the elastic isotropic medium (matrix) with oriented, straight carbon nanotubes (CNTs). The proposed rectangular plates have two opposite edges simply supported, while all possible combinations of free, simply supported and clamped boundary conditions are applied to the other two edges. The formulations are based on the three-dimensional elasticity theory. A semi-analytical approach composed of differential quadrature method (DQM) and series solution is adopted to solve the equations of motion. The fast rate of convergence of the method is demonstrated and comparison studies are carried out to establish its very high accuracy and versatility. The 2-D differential quadrature method as an efficient and accurate numerical tool is used to discretize the governing equations and to implement the boundary conditions. The convergence of the method is demonstrated and to validate the results, comparisons are made between the present results and results reported by well-known references for special cases treated before, have confirmed accuracy and efficiency of the present approach. The novelty of the present work is to exploit Eshelby-Mori-Tanaka approach in order to reveal the impacts of the volume fractions of oriented CNTs, different CNTs distributions, various coefficients of foundation and different combinations of free, simply supported and clamped boundary conditions on the vibrational characteristics of CGCNTR rectangular plates. The new results can be used as benchmark solutions for future researches.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.3.623
|
kci_detailed_000102.xml
|
||
ART002085135
|
oai_dc
|
Numerical analysis of channel connectors under fire and a comparison of performance with different types of shear connectors subjected to fire
|
Numerical analysis of channel connectors under fire and a comparison of performance with different types of shear connectors subjected to fire
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.E.M. Shahabi(University of Malaya); N.H. Ramli Sulong(University of Malaya); M. Shariati(University of Malaya); M. Mohammadhassani(Building & Housing Research Center); S.N.R. Shah(University of Malaya)"
] |
The behavior of shear connectors plays a significant role in maintaining the required strength of a composite beam in normal and hazardous conditions. Various types of shear connectors are available and being utilized in the construction industry according to their use. Channel connectors are a suitable replacement for conventional shear connectors. These connectors have been tested under different types of loading at ambient temperature; however, the behavior of these connectors at elevated temperatures has not been studied. This investigation proposes a numerical analysis approach to estimate the behavior of channel connectors under fire andcompare it with the numerical analysis performed in headed stud and Perfobond shear connectors subjected to fire. This paper first reviews the mechanism of various types of shear connectors and then proposes a non-linear thermomechanical finite element (FE) model of channel shear connectors embedded in high-strength concrete (HSC) subjected to fire. Initially, an accurate nonlinear FE model of the specimens tested at ambient temperature was developed to investigate the strength of the channel-type connectors embedded in an HSC slab. The outcomes were verified with the experimental study performed on the testing of channel connectors at ambient temperature by Shariati <i>et al</i>. (2012). The FE model at ambient temperature was extended to identify the behavior of channel connectors subjected to fire. A comparative study is performed to evaluate the performance of channel connectors against headed stud and Perfobond shear connectors. The channel connectors were found to be a more economical and easy-to-apply alternative to conventional shear connectors.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.3.651
|
kci_detailed_000102.xml
|
||
ART002085127
|
oai_dc
|
Component method model for predicting the moment resistance, stiffness and rotation capacity of minor axis composite seat and web site plate joints
|
Component method model for predicting the moment resistance, stiffness and rotation capacity of minor axis composite seat and web site plate joints
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Aleksander Kozlowski(Rzeszow University of Technology)"
] |
Codes EN 1993 and EN 1994 require to take into account actual joint characteristics in the global analysis. In order to implement the semi-rigid connection effects in frame design, knowledge of joint rotation characteristics (<i>M</i>-<i>φ</i>relationship), or at least three basic joint properties, namely the moment resistance <i>M<sub>R</sub></i>, the rotational stiffness <i>S<sub>j</sub></i> and rotation capacity, is required. To avoid expensive experimental tests many methods for predicting joint parameters were developed. The paper presents a comprehensive analytical model that has been developed for predicting the moment resistance <i>M<sub>R</sub></i>, initial stiffness <i>S<sub>j.ini</sub></i> and rotation capacity of the minor axis, composite, semi-rigid joint. This model is based on so-called component method included in EN 1993 and EN 1994. Comparison with experimental test results shows that a quite good agreement was achieved. A computer program POWZ containing proposed procedure were created. Based on the numerical simulation made with the use of this program and applying regression analysis, simplified equations for main joint properties were also developed.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.3.469
|
kci_detailed_000102.xml
|
||
ART002085128
|
oai_dc
|
Flexural bearing capacity of diaphragm-through joints of concrete-filled square steel tubular columns
|
Flexural bearing capacity of diaphragm-through joints of concrete-filled square steel tubular columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ruoyu Zhang(Tianjin University); Bin Rong(Tianjin University); Rui Liu(Tianjin University); Zhi-Hua Chen(Tianjin University); Fafitis Apostolos(Arizona State University)"
] |
In order to investigate the flexural bearing capacity of panel zone of diaphragm-through joint between concrete filled square steel tubular column and steel beam, four specimens were tested under static tension loads to study the mechanical properties and bearing capacity of diaphragm-through joints with a failure mode of panel zone. Finite element models of these specimens were developed to simulate the test and compare the predicted failure modes, load-displacement curves and bearing capacities with the experimentally observed. It was found that the tensile load from the steel beam flange is mainly shared by the square steel tube and the diaphragm. The diaphragm plastic zone appears along the cross-section lines enclosed by the square steel tube and the influence of steel beam web on the plastic zone of the steel tube is significant and cannot be neglected. Computational models of yield lines on square steel tube and diaphragm are established based on the distribution pattern of the plastic zone, and an analytical method for the evaluation of the bearing capacity of the joint is proposed. The theoretical results and the experimental data are compared and found in good agreement.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.3.487
|
kci_detailed_000102.xml
|
||
ART002085129
|
oai_dc
|
Three-dimensional finite element simulation and application of high-strength bolts
|
Three-dimensional finite element simulation and application of high-strength bolts
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Liji Long(Dalian University of Technology); Yongsong Yan(chongqing university); Xinlin Gao(China Communications Navigational Bu); Haigui Kang(National Engineering Technology Research)"
] |
High-strength structural bolts have been utilized for beam-to-column connections in steel-framed structural buildings. Failure of these components may be caused by the bolt shank fracture or threads stripping-off, documented in the literature. Furthermore, these structural bolts are galvanized for corrosion resistance or quenched-and-tempered in the manufacturing process. This paper adopted the finite element simulation to demonstrate discrete mechanical performance for these bolts under tensile loading conditions, the coated and uncoated numerical model has been built up for two numerical integration methods: explicit and implicit. Experimental testing and numerical methods can fully approach the failure mechanism of these bolts and their ultimate load capacities. Comparison has also been conducted for two numerical integration methods, demonstrating that the explicit integration procedure is also suitable for solving quasi-static problems. Furthermore, by using precise bolt models in T-Stub, more accurately simulate the mechanical behavior of T-Stub, which will lay the foundation of the mechanical properties of steel bolted joints.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.3.501
|
kci_detailed_000102.xml
|
||
ART002085130
|
oai_dc
|
Electro-elastic analysis of a sandwich thick plate considering FG core and composite piezoelectric layers on Pasternak foundation using TSDT
|
Electro-elastic analysis of a sandwich thick plate considering FG core and composite piezoelectric layers on Pasternak foundation using TSDT
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehdi Mohammadimehr(University of Kashan); Rasoul Rostami(University of Kashan); Mohammad Arefi(University of Kashan)"
] |
Third order shear deformation theory is used to evaluate electro-elastic solution of a sandwich plate with considering functionally graded (FG) core and composite face sheets made of piezoelectric layers. The plate is resting on the Pasternak foundation and subjected to normal pressure. Short circuited condition is applied on the top and bottom of piezoelectric layers. The governing differential equations of the system can be derived using Hamilton's principle and Maxwell's equation. The Navier's type solution for a sandwich rectangular thick plate with all edges simply supported is used. The numerical results are presented in terms of varying the parameters of the problem such as two elastic foundation parameters, thickness ratio (<i>h<sub>p</sub>/2h</i>), and power law index on the dimensionless deflection, critical buckling load, electric potential function, and the natural frequency of sandwich rectangular thick plate. The results show that the dimensionless natural frequency and critical buckling load diminish with an increase in the power law index, and vice versa for dimensionless deflection and electrical potential function, because of the sandwich thick plate with considering FG core becomes more flexible; while these results are reverse for thickness ratio.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.3.513
|
kci_detailed_000102.xml
|
||
ART002085131
|
oai_dc
|
Effect of stiffeners on steel plate shear wall systems
|
Effect of stiffeners on steel plate shear wall systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ahmad Rahmzadeh(University of Tehran); Mehdi Ghassemieh(University of Tehran); Yeonho Park(University of Texas at Arlington); Ali Abolmaali(University of Texas at Arlington)"
] |
Stiffeners have widely been used in lateral load resisting systems to improve the buckling stability of shear panels in steel frames. However, due to major differences between plate girders and steel plate shear walls (SPSWs), use of plate girder equations often leads to uneconomical and, in some cases, incorrect design of stiffeners. Hence, this paper uses finite element analysis (FEA) to describe the effect of the rigidity and arrangement of stiffeners on the buckling behavior of plates. The procedures consider transverse and/or longitudinal stiffeners in various practical configurations. Subsequently, curves and formulas for the design of stiffeners are presented. In addition, the influence of stiffeners on the inward forces subjected to the boundary elements and the tension field angle is investigated as well. The results indicate that the effective application of stiffeners in SPSW systems not only improves the structural behavior, such as stiffness, overall strength and energy absorption, but also leads to a reduction of the forces that are exerted on the boundary elements.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.3.545
|
kci_detailed_000102.xml
|
||
ART002085132
|
oai_dc
|
Nonlinear analysis and design of concrete-filled dual steel tubular columns under axial loading
|
Nonlinear analysis and design of concrete-filled dual steel tubular columns under axial loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Cheng-Yong Wan(Harbin Institute of Technology); Xiaoxiong Zha(Harbin Institute of Technology)"
] |
A new unified design formula for calculating the composite compressive strength of the axially loaded circular concrete filled double steel tubular (CFDST) short and slender columns is presented in this paper. The formula is obtained from the analytic solution by using the limit equilibrium theory, the cylinder theory and the &$34;Unified theory" under axial compression. Furthermore, the stability factor of CFDST slender columns is derived on the basis of the Perry-Robertson formula. This paper also reports the results of experiments and finite element analysis carried out on concrete filled double steel tubular columns, where the tested specimens include short and slender columns with different steel ratio and yield strength of inner tube; a new constitutive model for the concrete confined by both the outer and inner steel tube is proposed and incorporated in the finite element model developed. The comparisons among the finite element results, experimental results, and theoretical predictions show a good agreement in predicting the behavior and strength of the concrete filled steel tubular (CFST) columns with or without inner steel tubes. An important characteristic of the new formulas is that they provide a unified formulation for both the plain CFST and CFDST columns relating to the compressive strength or the stability bearing capacity and a set of design parameters.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.3.571
|
kci_detailed_000102.xml
|
||
ART002085133
|
oai_dc
|
Seismic experiment and analysis of rectangular bottom strengthened steel-concrete composite columns
|
Seismic experiment and analysis of rectangular bottom strengthened steel-concrete composite columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Cun Hui(Zhongyuan Univeristy of Technology); Yanzhi Zhu(Zhongyuan Univeristy of Technology); Wan-Lin Cao(Beijing University of Technology); Yuanqing Wang(Tsinghua University)"
] |
In order to study the working mechanism of rectangular steel-concrete composite columns subjected to compression-bending load and further determine the seismic performance index, a bottom strengthened rectangular steel reinforced concrete (SRC) column with concealed steel plates and a bottom strengthened rectangular concrete filled steel tube (CFST) columns were proposed. Six column models with different configurations were tested under horizontal low cyclic loading. Based on the experiments, the load-bearing capacity, stiffness and degradation process, ductility, hysteretic energy dissipation capacity, and failure characteristics of the models were analyzed. The loadbearing capacity calculation formulas for a normal section and an oblique section of bottom strengthened rectangular steel-concrete composite columns were pesented and a finite element (FE) numerical simulation of the classical specimens was performed. The study shows that the load-bearing capacity, ductility, and seismic energy dissipation capacity of the bottom strengthened rectangular steel-concrete composite columns are significantly improved compared to the conventional rectangular steel-concrete composite columns and the results obtained from the calculation and the FE numerical simulation are in good agreement with those from the experiments. The rectangular steel-concrete composite column with bottom strengthened shows better seismic behavior and higher energy dissipation capacity under suitable constructional requirements and it can be applied to the structure design of highrise buildings.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.3.599
|
kci_detailed_000102.xml
|
||
ART002107285
|
oai_dc
|
Nonlinear magneto-electro-mechanical vibration analysis of double-bonded sandwich Timoshenko microbeams based on MSGT using GDQM
|
Nonlinear magneto-electro-mechanical vibration analysis of double-bonded sandwich Timoshenko microbeams based on MSGT using GDQM
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Mohammadimehr(University of Kashan); S. Shahedi(University of Kashan)"
] |
In the present study, the nonlinear magneto-electro-mechanical free vibration behavior of rectangular double-bonded sandwich microbeams based on the modified strain gradient theory (MSGT) is investigated. It is noted that the top and bottom sandwich microbeams are considered with boron nitride nanotube reinforced composite face sheets (BNNTRC-SB) with electrical properties and carbon nanotube reinforced composite face sheets (CNTRC-SB) with magnetic fields, respectively, and also the homogenous core is used for both sandwich beams. The connections of every sandwich beam with its surrounding medium and also between them have been carried out by considering Pasternak foundations. To take size effect into account, the MSGT is introduced into the classical Timoshenko beam theory (CT) to develop a size-dependent beam model containing three additional material length scale parameters. For the CNTRC and BNNTRC face sheets of sandwich microbeams, uniform distribution (UD) and functionally graded (FG) distribution patterns of CNTs or BNNTs in four cases FG-X, FG-O, FG-A, and FG-V are employed. It is assumed that the material properties of face sheets for both sandwich beams are varied in the thickness direction and estimated through the extended rule of mixture. On the basis of the Hamilton's principle, the size-dependent nonlinear governing differential equations of motion and associated boundary conditions are derived and then discretized by using generalized differential quadrature method (GDQM). A detailed parametric study is presented to indicate the influences of electric and magnetic fields, slenderness ratio, thickness ratio of both sandwich microbeams, thickness ratio of every sandwich microbeam, dimensionless three material length scale parameters, Winkler spring modulus and various distribution types of face sheets on the first two natural frequencies of double-bonded sandwich microbeams. Furthermore, a comparison between the various beam models on the basis of the CT, modified couple stress theory (MCST), and MSGT is performed. It is illustrated that the thickness ratio of sandwich microbeams plays an important role in the vibrational behavior of the double-bonded sandwich microstructures. Meanwhile, it is concluded that by increasing <i>H</i>/<i>lm</i>, the values of first two natural frequencies tend to decrease for all amounts of the Winkler spring modulus.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.1.001
|
kci_detailed_000102.xml
|
||
ART002107286
|
oai_dc
|
Vibration and buckling analyses of laminated panels with and without cutouts under compressive and tensile edge loads
|
Vibration and buckling analyses of laminated panels with and without cutouts under compressive and tensile edge loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"T. Rajanna(Indian Institute of Technology Bombay); Sauvik Banerjee(Indian Institute of Technology Bombay); Yogesh M. Desai(Indian Institute of Technology Bombay); D.L. Prabhakara(Sahyadri College of Engineering & Manage)"
] |
In this study, the influence of centrally placed circular and square cutouts on vibration and buckling characteristics of different ply-oriented laminated panels under the action of compressive and/or tensile types of nonuniform in-plane edge loads are investigated. The panels are inspected under the action of uniaxial compression, uniaxial tension and biaxial, compression-tension, loading configurations. Furthermore, the effects of different degrees of edge restraints and panel aspect ratios are also addressed in this work. Towards this, a nine-node heterosis plate element has been adopted which includes the effect of shear deformation and rotary inertia. According to the results, the tensile buckling loads are higher than that of compressive buckling loads. However, the tensile buckling load continuously reduces with the increased cutout sizes irrespective of ply-orientations. This is also true for compressive buckling loads except for some particular ply-orientations with higher sized cutouts.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.1.037
|
kci_detailed_000102.xml
|
||
ART002107287
|
oai_dc
|
Prediction of Poisson's ratio degradation in hygrothermal aged and cracked [<i>θ<sub>m</sub></i>/90</i><sub>n</sub></i>]<i><sub>s</sub></i> composite laminates
|
Prediction of Poisson's ratio degradation in hygrothermal aged and cracked [<i>θ<sub>m</sub></i>/90</i><sub>n</sub></i>]<i><sub>s</sub></i> composite laminates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Khodjet-Kesba(Université de Blida1); E. A. Adda Bedia(Université de Sidi Bel Abbes); A. Benkhedda(Université de Blida1); B. Boukert(Université de Blida1)"
] |
The Poisson ratio reduction of symmetric hygrothermal aged [<i>θ<sub>m</sub></i>/90</i><sub>n</sub></i>]<i><sub>s</sub></i> composite laminates containing a transverse cracking in mid-layer is predicted by using a modified shear-lag model. Good agreement is obtained by comparing the prediction models and experimental data published by Joffe <i>et al</i>. (2001). The material properties of the composite are affected by the variation of temperature and transient moisture concentration distribution in desorption case, and are based on a micro-mechanical model of laminates. The transient and non-uniform moisture concentration distribution give rise to the transient Poisson ratio reduction. The obtained results represent well the dependence of the Poisson ratio degradation on the cracks density, fibre orientation angle of the outer layers and transient environmental conditions. Through the presented study, we hope to contribute to the understanding of the hygrothermal behaviour of cracked composite laminate.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.1.057
|
kci_detailed_000102.xml
|
||
ART002107288
|
oai_dc
|
Finite element study the seismic behavior of connection to replace the continuity plates in (NFT/CFT) steel columns
|
Finite element study the seismic behavior of connection to replace the continuity plates in (NFT/CFT) steel columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Adel Younesi(Semnan University); Omid Rezaifar(Semnan University)"
] |
The use of box columns has been increased due to the rigidity in rigid orthogonal moment resisting frames. On the other hand, the installation and welding of necessary horizontal continuity plates inside the columns are both labor-consuming and costly tasks. Accordingly, in this paper, a new beam-to-box column connection by trapezoidal external stiffeners and horizontal bar mats is presented to provide seismic parameters. The proposed connection consists of eight external stiffeners in the level of beam flanges and five horizontal bar mats in Concrete Filled Tube (CFT) columns. The new connection effectively alleviates the stress concentration and moves the plastic hinge away from the column face by horizontal external stiffeners. In addition, the result shows that proposed connection has provided the required strength and rigidity of connection, so that the increased strength, 8.08% and rigidity, 3.01% are compared to connection with internal continuity plates, also the results indicate that this connection can offer appropriate ductility and energy dissipation capacity for its potential application in moment resisting frames in seismic region. As a result, the proposed connection can be a good alternative for connection with continuity plates.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.1.073
|
kci_detailed_000102.xml
|
||
ART002107289
|
oai_dc
|
Closed-form fragility analysis of the steel moment resisting frames
|
Closed-form fragility analysis of the steel moment resisting frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Banazadeh(Amirkabir University of Technology); M. Kia(Amirkabir University of Technology)"
] |
Seismic fragility analysis is a probabilistic decision-making framework which is widely implemented for evaluating vulnerability of a building under earthquake loading. It requires ingredient named probabilistic model and commonly developed using statistics requiring collecting data in large quantities. Preparation of such a data-base is often costly and time-consuming. Therefore, in this paper, by developing generic seismic drift demand model for regular-multi-story steel moment resisting frames is tried to present a novel application of the probabilistic decisionmaking analysis to practical purposes. To this end, a demand model which is a linear function of intensity measure in logarithmic space is developed to predict overall maximum inter-story drift. Next, the model is coupled with a set of regression-based equations which are capable of directly estimating unknown statistical characteristics of the model parameters.To explicitly address uncertainties arise from randomness and lack of knowledge, the Bayesian regression inference is employed, when these relations are developed. The developed demand model is then employed in a Seismic Fragility Analysis (SFA) for two designed building. The accuracy of the results is also assessed by comparison with the results directly obtained from Incremental Dynamic analysis.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.1.093
|
kci_detailed_000102.xml
|
||
ART002107296
|
oai_dc
|
Parametric modeling and shape optimization design of five extended cylindrical reticulated shells
|
Parametric modeling and shape optimization design of five extended cylindrical reticulated shells
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"X.Y. Lu(Shandong Jianzhu University); J. WU(Shandong University); S.C. Li(Shandong University); Z.D. Wang(Shantui Construction Machinery co.); L.P. Li(Shandong University); Y.G. Xue(Shandong University)"
] |
Five extended cylindrical reticulated shells are proposed by changing distribution rule of diagonal rods based on three fundamental types. Modeling programs for fundamental types and extended types of cylindrical reticulated shell are compiled by using the ANSYS Parametric Design Language (APDL). On this basis, conditional formulas are derived when the grid shape of cylindrical reticulated shells is equilateral triangle. Internal force analysis of cylindrical reticulated shells is carried out. The variation and distribution regularities of maximum displacement and stress are studied. A shape optimization program is proposed by adopting the sequence two-stage algorithm (RDQA) in FORTRAN environment based on the characteristics of cylindrical reticulated shells and the ideas of discrete variable optimization design. Shape optimization is achieved by considering the objective function of the minimum total steel consumption, global and locality constraints. The shape optimization for three fundamental types and five extended types is calculated with the span of 30 m~80 m and rise-span ratio of 1/7~1/3. The variations of the total steel consumption along with the span and rise-span ratio are analyzed with contrast to the results of shape optimization. The optimal combination of main design parameters for five extended cylindrical reticulated shells is investigated. The total steel consumption affected by distribution rule of diagonal rods is discussed. The results show that: (1) Parametric modeling method is simple, efficient and practical, which can quickly generate different types of cylindrical reticulated shells. (2) The mechanical properties of five extended cylindrical reticulated shells are better than their fundamental types. (3) The total steel consumption of cylindrical reticulated shells is optimized to be the least when rise-span ratio is 1/6. (4) The extended type of three-way grid cylindrical reticulated shell should be preferentially adopted in practical engineering. (5) The grid shape of reticulated shells should be designed to equilateral triangle as much as possible because of its reasonable stress and the lowest total steel consumption.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.1.247
|
kci_detailed_000102.xml
|
||
ART002107290
|
oai_dc
|
Influence of creep on dynamic behavior of concrete filled steel tube arch bridges
|
Influence of creep on dynamic behavior of concrete filled steel tube arch bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yuan-Feng Wang(Beijing Jiaotong University); Yi-Shuo Ma(Beijing Jiaotong University); Li Su(Beijing Jiaotong University); Shengqi Mei(Beijing Jiaotong University)"
] |
Concrete creep, while significantly changing the static behaviors of concrete filled steel tube (CFST) structures, do alter the structures' dynamic behaviors as well, which is studied quite limitedly. The attempt to investigate the influence of concrete creep on the dynamic property and response of CFST arch bridges was made in this paper. The mechanism through which creep exerts its influence was analyzed first; then a predicative formula was proposed for the concrete elastic modulus after creep based on available test data; finally a numerical analysis for the effect of creep on the dynamic behaviors of a long-span half-through CFST arch bridge was conducted. It is demonstrated that the presence of concrete creep increases the elastic modulus of concrete, and further magnifies the seismic responses of the displacement and internal force in some sections of the bridge. This influence is related closely to the excitation and the structure, and should be analyzed case-by-case.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.1.109
|
kci_detailed_000102.xml
|
||
ART002107291
|
oai_dc
|
Static analysis of the FGM plate with porosities
|
Static analysis of the FGM plate with porosities
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R. Benferhat(Université Hassiba Benbouali de Chlef); T. Hassaine Daouadji(Université Ibn Khaldoun de Tiaret); L. Hadji(Université Ibn Khaldoun de Tiaret); M. Said Mansour(Université Hassiba Benbouali de Chlef)"
] |
This work focuses on the behavior of the static analysis of functionally graded plates materials (FGMs) with porosities that may possibly occur inside the functionally graded materials (FGMs) during their fabrication. For this purpose a new refined plate theory is used in this work, it contains only four unknowns, unlike five unknowns for other theories. This new model meets the nullity of the transverse shear stress at the upper and lower surfaces of the plate. The parabolic distribution of transverse shear stresses along the thickness of the plate is taken into account in this analysis; the material properties of the FGM plate vary a power law distribution in terms of volume fraction of the constituents. The rule of mixture is modified to describe and approximate material properties of the FG plates with porosity phases. The validity of this theory is studied by comparing some of the present results with other higher-order theories reported in the literature, the influence of material parameter, the volume fraction of porosity and the thickness ratio on the behavior mechanical P-FGM plate are represented by numerical examples.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.1.123
|
kci_detailed_000102.xml
|
||
ART002107292
|
oai_dc
|
Experimental studies on behaviour of bolted ball-cylinder joints under axial force
|
Experimental studies on behaviour of bolted ball-cylinder joints under axial force
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiaonong Guo(Tongji University); Zewei Huang(Tongji University); Zhe Xiong(Tongji University); Shangfei Yang(Tongji University); Li Peng(Shanghai T&D Architechral Technology Co.)"
] |
Due to excellent advantages such as better illuminative effects, considerable material savings and ease and rapidness of construction, the bolted ball-cylinder joint which is a new type joint system has been proposed in space truss structures. In order to reveal more information and understanding on the behaviour of bolted ball-cylinder joints, full-scale experiments on eight bolted ball-cylinder joint specimens were conducted. Five joint specimens were subjected to axial compressive force, while another three joint specimens were subjected to axial tensile force. The parameters investigated herein were the outside diameter of hollow cylinders, the height of hollow cylinders, the thickness of hollow cylinders, ribbed stiffener and axial force. These joint specimens were collapsed by excessive deformation of hollow cylinders, punching damage of hollow cylinders, evulsion of bolts, and weld cracking. The strain distributions on the hollow cylinder opening were mainly controlled by bending moments. To improve the ultimate bearing capacity and axial stiffness of bolted ball-cylinder joints, two effective measures were developed: (1) the thickness of the hollow cylinder needed to be thicker; (2) the ribbed stiffener should be adopted. In addition, the axial stiffness of bolted ball-cylinder joints exhibited significant non-linear characteristics.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.1.137
|
kci_detailed_000102.xml
|
||
ART002107293
|
oai_dc
|
Experimental research on seismic behavior of SRC-RC transfer columns
|
Experimental research on seismic behavior of SRC-RC transfer columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kai Wu(Hohai University); Jianyang Xue(Xi’an University of Architecture & Techn); Yang Nan(Hohai University); Hongtie Zhao(Xi’an University of Architecture & Techn)"
] |
It was found that the lateral stiffness changes obvious at the transfer position of the section configuration from SRC to RC. This particular behavior leads to that the transfer columns become as the important elements in SRC-RC hybrid structures. A comprehensive study was conducted to investigate the seismic behavior of SRC-RC transfer columns based on a low cyclic loading test of 16 transfer columns compared with 1 RC column. Test results shows three failure modes for transfer columns, which are shear failure, bond failure and bend failure. Its seismic behavior was completely analyzed about the failure mode, hysteretic and skeleton curves, bearing capacity deformation ability, stiffness degradation and energy dissipation. It is further determined that displacement ductility coefficient of transfer columns changes from 1.97 to 5.99. The stiffness of transfer columns are at the interval of SRC and RC, and hence transfer columns can play the role of transition from SRC to RC. All specimens show similar discipline of stiffness degradation and the process can be divided into three parts. Some specimens of transfer column lose bearing capacity swiftly after shear cracking and showed weak energy dissipation ability, but the others show better ability of energy dissipation than RC column.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.1.157
|
kci_detailed_000102.xml
|
||
ART002107294
|
oai_dc
|
Study on mechanical behaviors of cable-supported ribbed beam composite slab structure during construction phase
|
Study on mechanical behaviors of cable-supported ribbed beam composite slab structure during construction phase
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"W.T. Qiao(Shi Jiazhuang Tiedao University); Q. An(Tianjin University); D. Wang(University of Alabama in Huntsville); M.S. Zhao(Nanyang Technological University)"
] |
The cable-supported ribbed beam composite slab structure (CBS) is a new type of pre-stressed hybrid structure. The standard construction method of CBS including five steps and two key phases are proposed in this paper. The theoretical analysis and experimental research on a 1:5 scaled model were carried out. First, the tensioning construction method based on deformation control was applied to pre-stress the cables. The research results indicate that the actual tensile force applied to the cable is slightly larger than the theoretical value, and the error is about 6.8%. Subsequently, three support dismantling schemes are discussed. Scheme one indicates that each span of CBS has certain level of mechanical independence such that the construction of a span is not significantly affected by the adjacent spans. It is shown that dismantling from the middle to the ends is an optimal support dismantling method. The experimental research also indicates that by using this method, the CBS behaves identically with the numerical analysis results during the construction and service.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.1.177
|
kci_detailed_000102.xml
|
||
ART002107295
|
oai_dc
|
Dynamic characteristics analysis of partial-interaction composite continuous beams
|
Dynamic characteristics analysis of partial-interaction composite continuous beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Genshen Fang(Tongji University); Jingquan Wang(Southeast University); Shuai Li(Southeast University); Shubin Zhang(Jiangsu Province Communications Planning and Design Institute Co.)"
] |
The dynamic characteristics of continuous steel-concrete composite beams considering the effect of interlayer slip were investigated based on Euler Bernoulli's beam theory. A simplified calculation model was presented, in which the Mode Stiffness Matrix (MSM) was developed. The natural frequencies and modes of partialinteraction composite continuous beams can be calculated accurately and easily by the use of MSM. Proceeding from the present method, the natural frequencies of two-span steel-concrete composite continuous beams with different span-ratios (0.53, 0.73, 0.85, 1) and different shear connection stiffnesses on the interface are calculated. The influence pattern of interfacial stiffness on bending vibration frequency was found. With the decrease of shear connection stiffness on the interface, the flexural vibration frequencies decrease obviously. And the influence on low order modes is more obvious while the reduction degree of high order is more sizeable. The real natural frequencies of partial-interaction continuous beams commonly used could have a 20% to 40% reduction compared with the fully-interaction ones. Furthermore, the reduction-ratios of natural frequencies for different span-ratios two-span composite beams with uniform shear connection stiffnesses are totally the same. The span-ratio mainly impacts on the mode shape. Four kinds of shear connection stiffnesses of steel-concrete composite continuous beams are calculated and compared with the experimental data and the FEM results. The calculated results using the proposed method agree well with the experimental and FEM ones on the low order modes which mainly determine the vibration properties.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.1.195
|
kci_detailed_000102.xml
|
||
ART002097714
|
oai_dc
|
Size-dependent mechanical behavior of functionally graded trigonometric shear deformable nanobeams including neutral surface position concept
|
Size-dependent mechanical behavior of functionally graded trigonometric shear deformable nanobeams including neutral surface position concept
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abdelouahed Tounsi(University of Sidi Bel Abbes); Mama Ahouel(University of Sidi Bel Abbes); Mohammed Sid Ahmed Houari(University of Sidi Bel Abbes); E.A Adda Bedia(University of Sidi Bel Abbes)"
] |
A nonlocal trigonometric shear deformation beam theory based on neutral surface position is developed for bending, buckling, and vibration of functionally graded (FG) nanobeams using the nonlocal differential constitutive relations of Eringen. The present model is capable of capturing both small scale effect and transverse shear deformation effects of FG nanobeams, and does not require shear correction factors. The material properties of the FG nanobeam are assumed to vary in the thickness direction. The equations of motion are derived by employing Hamilton's principle, and the physical neutral surface concept. Analytical solutions are presented for a simply supported FG nanobeam, and the obtained results compare well with those predicted by the nonlocal Timoshenko beam theory.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.5.963
|
kci_detailed_000102.xml
|
||
ART002097715
|
oai_dc
|
The effect of curvature on the impact response of foam-based sandwich composite panels
|
The effect of curvature on the impact response of foam-based sandwich composite panels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Melis Yurddaskal(Celal Bayar University); Buket Okutan Baba(Celal Bayar University)"
] |
The aim of this study is to investigate the impact behavior and impact-induced damage of sandwich composites made of E-glass/epoxy face sheets and PVC foam. The studies were carried out on square flat and curved sandwich panels with two different radius of curvatures. Impact tests were performed under impact energies of 10 J, 25 J and 80 J using an instrumented drop-weight machine. Contact force and displacement versus time and contact force- displacement graphs of sandwich panels were presented to determine the panel response. Through these graphs, the energy absorbing capacity of the sandwich panels was determined. The impact responses and failure modes of flat and curved sandwich panels were compared and the effect of curvature on sandwich composite panel was demonstrated. Testing has shown that the maximum contact force decrease while displacement increases with increasing of panel curvature and curved panels exhibits mixed failure mode, with cylindrical and cone cracking.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.5.983
|
kci_detailed_000102.xml
|
||
ART002097716
|
oai_dc
|
Performance of steel beams strengthened with pultruded CFRP plate under various exposures
|
Performance of steel beams strengthened with pultruded CFRP plate under various exposures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Gholami(Road, Housing and Urban Development Research Center); A.R. Mohd Sam(Universiti Teknologi Malaysia); A.K. Marsono(Universiti Teknologi Malaysia); M.M. Tahir(Universiti Teknologi Malaysia); I. Faridmehr(Universiti Teknologi Malaysia)"
] |
The use of Carbon Fiber Reinforced Polymer (CFRP) to strengthen steel structures has attracted the attention of researchers greatly. Previous studies demonstrated bonding of CFRP plates to the steel sections has been a successful method to increase the mechanical properties. However, the main limitation to popular use of steel/CFRP strengthening system is the concern on durability of bonding between steel and CFRP in various environmental conditions. The paper evaluates the performance of I-section steel beams strengthened with pultruded CFRP plate on the bottom flange after exposure to diverse conditions including natural tropical climate, wet/dry cycles, plain water, salt water and acidic solution. Four-point bending tests were performed at specific intervals and the mechanical properties were compared to the control beam. Besides, the ductility of the strengthened beams and distribution of shear stress in adhesive layer were investigated thoroughly. The study found the adhesive layer was the critical part and the performance of the system related directly to its behavior. The highest strength degradation was observed for the beams immersed in salt water around 18% after 8 months exposure. Besides, the ductility of all strengthened beams increased after exposure. A theoretical procedure was employed to model the degradation of epoxy adhesive.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.5.999
|
kci_detailed_000102.xml
|
||
ART002097718
|
oai_dc
|
Flexural natural vibration characteristics of composite beam considering shear deformation and interface slip
|
Flexural natural vibration characteristics of composite beam considering shear deformation and interface slip
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wangbao Zhou(Guangzhou University); Lizhong Jiang(Central South University); Zhi Huang(Central South University); Shujin Li(Wuhan University of Technology)"
] |
Based on Hamilton's principle, the flexural vibration differential equations and boundary conditions of the steel-concrete composite beam (SCCB) with comprehensive consideration of the influences of the shear deformation, interface slip and longitudinal inertia of motion were derived. The analytical natural frequencies of flexural vibration were compared with available results previously observed by the experiments, the results calculated by the FE model and the other similar beam theories available in the open literatures. The comparison results showed that, the calculation results of the analytical and Timoshenko models had a good agreement with the results of the experimental test and FE model. Finally, the influences of shear deformation and interface slip on the flexural natural frequencies of the SCCB were discussed. The shear deformation effect increases with the increase of the mode orders of flexural natural vibration, and the flexural natural frequencies of the higher mode orders ignoring the influence of shear deformations effect would be overestimated. The interface slip effect decrease with the increase of the mode orders of flexural natural vibration, and the influence of the interface slip effect on flexural natural frequencies of the low mode orders is significant. The influence of the degree of shear connection on shear deformation effect is insignificant, and the low order modes of flexural natural vibration are mainly composed of the rotational displacement of cross sections.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.5.1023
|
kci_detailed_000102.xml
|
||
ART002097719
|
oai_dc
|
Static analysis of laminated and sandwich composite doubly-curved shallow shells
|
Static analysis of laminated and sandwich composite doubly-curved shallow shells
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Veysel Alankaya(Turkish Naval Academy); Ahmet Sinan Oktem(Gebze Technical University)"
] |
A new analytical solution based on a third order shear deformation theory for the problem of static analysis of cross-ply doubly-curved shells is presented. The boundary-discontinuous generalized double Fourier series method is used to solve highly coupled linear partial differential equations with the mixed type simply supported boundary conditions prescribed on the edges. The complementary boundary constraints are introduced through boundary discontinuities generated by the selected boundary conditions for the derivation of the complementary solution. The numerical accuracy of the solution is compared by studying the comparisons of deflections, stresses and moments of symmetric and anti-symmetric laminated shells with finite element results using commercially available software under uniformly distributed load. Results are in good agreement with finite element counterparts. Additional results of the symmetric and anti-symmetric laminated and sandwich shells under single point load at the center and pressure load, are presented to provide data for the unsolved boundary conditions, benchmark comparisons and verifications.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.5.1043
|
kci_detailed_000102.xml
|
||
ART002097720
|
oai_dc
|
Experimental and analytical behaviour of cogged bars within concrete filled circular tubes
|
Experimental and analytical behaviour of cogged bars within concrete filled circular tubes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tilak Pokharel(University of Melbourne); Huang Yao(University of Melbourne); Helen M. Goldsworthy(University of Melbourne); Emad F. Gad(Swinburne University of Technology)"
] |
Recent research on steel moment-resisting connection between steel beams and concrete filled steel tubes has shown that there are considerable advantages to be obtained by anchoring the connection to the concrete infill within the tube using anchors in blind bolts. In the research reported here, extensive experimental tests and numerical analyses have been performed to study the anchorage behaviour of cogged deformed reinforcing bars within concrete filled circular steel tubes. This data in essential knowledge for the design of the steel connections that use anchored blind bolts, both for strength and stiffness. A series of pull-out tests were conducted using steel tubes with different diameter to thickness ratios under monotonic and cyclic loading. Both hoop strains and longitudinal strains in the tubes were measured together with applied load and slip. Various lead-in lengths before the bend and length of tailed extension after the bend were examined. These dimensions were limited by the dimensions of the steel tube and did not meet the requirements for “standard” cogs as specified in concrete standards such as AS 3600 and ACI 318. Nevertheless, all of the tested specimens failed by bar fracture outside the steel tubes. A comprehensive 3D Finite Element model was developed to simulate the pull-out tests. The FE model took into account material nonlinearities, deformations in reinforcing bars and interactions between different surfaces. The FE results were found to be in good agreement with experimental results. This model was then used to conduct parametric studies to investigate the influence of the confinement provided by the steel tube on the infilled concrete.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.5.1067
|
kci_detailed_000102.xml
|
||
ART002097721
|
oai_dc
|
Free vibration analysis of composite cylindrical shells with non-uniform thickness walls
|
Free vibration analysis of composite cylindrical shells with non-uniform thickness walls
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Saira Javed(Universiti Teknologi Malaysia); K.K. Viswanathan(Universiti Teknologi Malaysia); Z. A. Aziz(Universiti Teknologi Malaysia)"
] |
The paper proposes to characterize the free vibration behaviour of non-uniform cylindrical shells using spline approximation under first order shear deformation theory. The system of coupled differential equations in terms of displacement and rotational functions are obtained. These functions are approximated by cubic splines. A generalized eigenvalue problem is obtained and solved numerically for an eigenfrequency parameter and an associated eigenvector which are spline coefficients. Four and two layered cylindrical shells consisting of two different lamination materials and plies comprising of same as well as different materials under two different boundary conditions are analyzed. The effect of length parameter, circumferential node number, material properties, ply orientation, number of lay ups, and coefficients of thickness variations on the frequency parameter is investigated.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.5.1087
|
kci_detailed_000102.xml
|
||
ART002097722
|
oai_dc
|
2D deformation in initially stressed thermoelastic half-space with voids
|
2D deformation in initially stressed thermoelastic half-space with voids
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ibrahim A. Abbas(University Of Jeddah); Rajneesh Kumar(Kurukshetra University)"
] |
The present investigation is to study the plane problem in initially stressed thermoelastic half-space with voids due to thermal source. Lord-Shulman (Lord and Shulman 1967) theory of thermoelasticity with one relaxation time has been used to investigate the problem. A particular type of thermal source has been taken as an application of the approach. Finite element technique has been used to solve the problem. The components of displacement, stress, temperature change and volume fraction field are computed numerically. The resulting quantities are depicted graphically for different values of initial stress parameter. The relaxation time and the initial stress parameter have a significant effect on all distributions.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.5.1103
|
kci_detailed_000102.xml
|
||
ART002097723
|
oai_dc
|
A hybrid inverse method for small scale parameter estimation of FG nanobeams
|
A hybrid inverse method for small scale parameter estimation of FG nanobeams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali. R. Vosoughi(Shiraz University); A. Darabi(Shiraz University)"
] |
As a first attempt, an inverse hybrid numerical method for small scale parameter estimation of functionally graded (FG) nanobeams using measured frequencies is presented. The governing equations are obtained with the Eringen's nonlocal elasticity assumptions and the first-order shear deformation theory (FSDT). The equations are discretized by using the differential quadrature method (DQM). The discretized equations are transferred from temporal domain to frequency domain and frequencies of the nanobeam are obtained. By applying random error to these frequencies, measured frequencies are generated. The measured frequencies are considered as input data and inversely, the small scale parameter of the beam is obtained by minimizing a defined functional. The functional is defined as root mean square error between the measured frequencies and calculated frequencies by the DQM. Then, the conjugate gradient (CG) optimization method is employed to minimize the functional and the small scale parameter is obtained. Efficiency, convergence and accuracy of the presented hybrid method for small scale parameter estimation of the beams for different applied random error, boundary conditions, length-to-thickness ratio and volume fraction coefficients are demonstrated.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.5.1119
|
kci_detailed_000102.xml
|
||
ART002097724
|
oai_dc
|
Additive 2D and 3D performance ratio analysis for steel outrigger alternative design
|
Additive 2D and 3D performance ratio analysis for steel outrigger alternative design
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이동규(Sejong University)"
] |
In this article, an additive performance ratio method using structural analysis of both 2D and 3D is introduced to mitigate the complexity of work evaluating structural performances of numerous steel outrigger alternatives in multi-story buildings, especially high-rise buildings. The combined structural analysis process enables to be the design of economic, safe, and as constructional demanding structures by exploiting the advantages of steel, namely: excellent energy dissipation and ductility. First the approach decides the alternative of numerous steel outriggers by a simple 2D analysis module and then the alternative is evaluated by 3D analysis module. Initial structural analyses of outrigger types are carried out through MIDAS Gen 2D modeling, approximately, and then the results appeal structural performance and lead to decide some alternative of outrigger types. ETABS 3D modeling is used with respect to realization and evaluation of exact structural behaviors. The approach reduces computational burden in compared to existing concepts such as full 3D analysis methods. The combined 2D and 3D tools are verified by cycle and displacement tests including comprehensive nonlinear dynamic simulations. The advantages and limitations of the Additive Performance Ratio Approach are highlighted in a case study on a high rise steelcomposite building, which targets at designing the optimized alternative to the existing original outrigger for lateral load resisting system.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.5.1133
|
kci_detailed_000102.xml
|
||
ART002097725
|
oai_dc
|
Demands and distribution of hysteretic energy in moment resistant self-centering steel frames
|
Demands and distribution of hysteretic energy in moment resistant self-centering steel frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Arturo López-Barraza(Universidad Autónoma de Sinaloa); Sonia E. Ruiz(Universidad Nacional Autónoma de México); Alfredo Reyes-Salazar(Universidad Autónoma de Sinaloa); Edén Bojórquez(Universidad Autónoma de Sinaloa)"
] |
Post-tensioned (PT) steel moment resisting frames (MRFs) with semi-rigid connections (SRC) can be used to control the hysteretic energy demands and to reduce the maximum inter-story drift (<i>γ</i>). In this study the seismic behavior of steel MRFs with PT connections is estimated by incremental nonlinear dynamic analysis in terms of dissipated hysteretic energy (<i>E<sub>H</sub></i>) demands. For this aim, five PT steel MRFs are subjected to 30 long duration earthquake ground motions recorded on soft soil sites. To assess the energy dissipated in the frames with PT connections, a new expression is proposed for the hysteretic behavior of semi-rigid connections validated by experimental tests. The performance was estimated not only for the global <i>E<sub>H</sub></i> demands in the steel frames; but also for, the distribution and demands of hysteretic energy in beams, columns and connections considering several levels of deformation. The results show that <i>E<sub>H</sub></i> varies with <i>γ</i>, and that most of <i>E<sub>H</sub></i> is dissipated by the connections. It is observed in all the cases a log-normal distribution of <i>E<sub>H</sub></i> through the building height. The largest demand of <i>E<sub>H</sub></i> occurs between 0.25 and 0.5 of the height. Finally, an equation is proposed to calculate the distribution of <i>E<sub>H</sub></i> in terms of the normalized height of the stories (<i>h</i>/<i>H</i>) and the inter-story drift.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.5.1155
|
kci_detailed_000102.xml
|
||
ART002030393
|
oai_dc
|
Viscous fluid induced vibration and instability of FG-CNT-reinforced cylindrical shells integrated with piezoelectric layers
|
Viscous fluid induced vibration and instability of FG-CNT-reinforced cylindrical shells integrated with piezoelectric layers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mahmood Rabani Bidgoli(Semnan University); Mohammad Saeed Karimi(Semnan University); Ali Ghorbanpour Arani(University of Kashan)"
] |
In this paper, viscous fluid induced nonlinear free vibration and instability analysis of a functionally graded carbon nanotube-reinforced composite (CNTRC) cylindrical shell integrated with two uniformly distributed piezoelectric layers on the top and bottom surfaces of the cylindrical shell are presented. Single-walled carbon nanotubes (SWCNTs) are selected as reinforcement and effective material properties of FG-CNTRC cylindrical shell are assumed to be graded through the thickness direction and are estimated through the rule of mixture. The elastic foundation is modeled by temperature-dependent orthotropic Pasternak medium. Considering coupling of mechanical and electrical fields, Mindlin shell theory and Hamilton's principle, the motion equations are derived. Nonlinear frequency and critical fluid velocity of sandwich structure are calculated based on differential quadrature method (DQM). The effects of different parameters such as distribution type of SWCNTs, volume fractions of SWCNTs, elastic medium and temperature gradient are discussed on the vibration and instability behavior of the sandwich structure. Results indicate that considering elastic foundation increases frequency and critical fluid velocity of system.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.713
|
kci_detailed_000102.xml
|
||
ART002030392
|
oai_dc
|
Prediction of hysteretic energy demands in steel frames using vector-valued IMs
|
Prediction of hysteretic energy demands in steel frames using vector-valued IMs
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Edén Bojórquez(Universidad Autónoma de Sinaloa); Laura Astorga(Universidad Autónoma de Sinaloa); Alfredo Reyes-Salazar(Universidad Autónoma de Sinaloa); Amador Terán-Gilmore(Universidad Autónoma Metropolitana); Juan Velázquez-Dimas(Universidad Autónoma de Sinaloa); Juan Bojórquez(Universidad Nacional Autónoma de México); Luz Rivera(Universidad Autónoma de Sinaloa)"
] |
It is well known the importance of considering hysteretic energy demands for the seismic assessment and design of structures. In such a way that it is necessary to establish new parameters of the earthquake ground motion potential able to predict energy demands in structures. In this paper, several alternative vector-valued ground motion intensity measures (IMs) are used to estimate hysteretic energy demands in steel framed buildings under long duration narrow-band ground motions. The vectors are based on the spectral acceleration at first mode of the structure Sa(T1) as first component. As the second component, IMs related to peak, integral and spectral shape parameters are selected. The aim of the study is to provide new parameters or vector-valued ground motion intensities with the capacity of predicting energy demands in structures. It is concluded that spectral-shape-based vector-valued IMs. have the best relation with hysteretic energy demands in steel frames subjected to narrow-band earthquake ground motions.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.697
|
kci_detailed_000102.xml
|
||
ART002030395
|
oai_dc
|
Dynamic behavior of piezoelectric bimorph beams with a delamination zone
|
Dynamic behavior of piezoelectric bimorph beams with a delamination zone
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Adel Zemirline(University of Saad Dahleb); Mohammed Ouali(University of Saad Dahleb); Ali Mahieddine(Khemis Miliana University)"
] |
The First Order Shear Deformation Theory (FOSDT) is considered to study the dynamic behavior of a bimorph beam. A delamination zone between the upper and the lower layer has been taken into consideration; the beam is discretised using the finite elements method (FEM). Several parameters are taken into consideration like structural damping, the geometry, the load nature and the configurations of the boundary conditions. Results show that the delamination between the upper and the lower layer affects considerably the actuation.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.759
|
kci_detailed_000102.xml
|
||
ART002030389
|
oai_dc
|
Vibration analysis of a pre-stressed laminated composite curved bea
|
Vibration analysis of a pre-stressed laminated composite curved bea
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hasan Ozturk(Dokuz Eylul University Buca)"
] |
In this study, natural frequency analysis of a large deflected cantilever laminated composite beam fixed at both ends, which forms the case of a pre-stressed curved beam, is investigated. The laminated beam is considered to have symmetric and asymmetric lay-ups and the effective flexural modulus of the beam is used in the analysis. In order to obtain the pre-stressed composite curved beam case, an external vertical concentrated load is applied at the free end of a cantilever laminated composite beam and then the loading point of the deflected beam is fixed. The non-linear deflection curve of the flexible beam undergoing large deflection is obtained by the Reversion Method. The curved laminated composite beam is modeled by using the Finite Element Method with a straight-beam element approach. The effects of orientation angle and vertical load on the natural frequency parameter for the first four modes are examined and the results obtained are given in graphics. It has been found that the effect of the load parameter, which forms the curved laminated beam, on the natural frequency parameter, almost disappears after a certain value of the load parameter. This certain value differs for each laminated curved beam and each vibration mode.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.635
|
kci_detailed_000102.xml
|
||
ART002030382
|
oai_dc
|
Seismic behavior of rebar-penetrated joint between GCFST column and RGC beam
|
Seismic behavior of rebar-penetrated joint between GCFST column and RGC beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guochang Li(Shenyang Jianzhu University); Chen Fang(University of Texas at El Paso); Yuwei An(Shenyang Jianzhu University); Xing Zhao(Shenyang Jianzhu University)"
] |
The paper makes the experimental and finite-element-analysis investigation on the seismic behavior of the rebar-penetrated joint between gangue concrete filled steel tubular column and reinforced gangue concrete beam under low cyclic reversed loading. Two specimens are designed and conducted for the experiment to study the seismic behavior of the rebar-penetrated joint under cyclic loading. Then, finite element analysis models of the rebar-penetrated joint are developed using ABAQUS 6.10 to serve as the complement of the experiment and further analyze the seismic behavior of the rebar-penetrated joint. Finite element analysis models are also verified by the experimental results. Finally, the hysteretic performance, the bearing capacity, the strength degradation, the rigidity degradation, the ductility and the energy dissipation of the rebar-penetrated joint are evaluated in detail to investigate the seismic behavior of the rebar-penetrated joint through experimental results and finite element analysis results. The research demonstrates that the rebar-penetrated joint between gangue concrete filled steel tubular column and reinforced gangue concrete beam, with full and spindle-shaped load-displacement hysteretic curves, shows generally the high ductility and the outstanding energy-dissipation capacity. As a result, the rebar-penetrated joint exhibits the excellent seismic performance and meets the earthquake-resistant requirements of the codes in China. The research provides some references and suggestions for the application of the rebar-penetrated joint in the projects.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.547
|
kci_detailed_000102.xml
|
||
ART002030396
|
oai_dc
|
Fabrication and properties of in-situ Al/AlB<sub>2</sub> composite reinforced with high aspect ratio borides
|
Fabrication and properties of in-situ Al/AlB<sub>2</sub> composite reinforced with high aspect ratio borides
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ramazan Kayikci(Sakarya University); Ömer Savaş(Yildiz Technical University)"
] |
Production and properties of metal matrix composites reinforced with an in-situ high aspect ratio AlB2 flake have been investigated. Boron 2.2wt.% was dissolved in pure Al and Al-Cu alloy at 1300℃ by adding directly boron oxide which resulted in 4 vol.% reinforcing phase. The in-situ AlB2 flake concentration was increased up to 30 vol.% in order to increase the tensile strength of the composites. Hardness, compressive strength and tensile strength of the composite were measured and compared with their matrix. Results showed that 30 vol.% A1B2/Al composite show a 193% increase in the compressive strength and a 322% increase in compressive yield strength. Results also showed that ductility of composites decreases with adding AlB2 reinforcements.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.777
|
kci_detailed_000102.xml
|
||
ART002030397
|
oai_dc
|
Numerical analysis of FGM plates with variable thickness subjected to thermal buckling
|
Numerical analysis of FGM plates with variable thickness subjected to thermal buckling
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Otbi Bouguenina(University of Saida); Khalil Belakhdar(University of Saida); Abdelouahed Tounsi(University of Sidi Bel Abbes); El Abbes Adda Bedia(University of Sidi Bel Abbes)"
] |
A numerical solution using finite difference method to evaluate the thermal buckling of simply supported FGM plate with variable thickness is presented in this research. First, the governing differential equation of thermal stability under uniform temperature through the plate thickness is derived. Then, the governing equation has been solved using finite difference method. After validating the presented numerical method with the analytical solution, the finite difference formulation has been extended in order to include variable thickness. The accuracy of the finite difference method for variable thickness plate has been also compared with the literature where a good agreement has been found. Furthermore, a parametric study has been conducted to analyze the effect of material and geometric parameters on the thermal buckling resistance of the FGM plates. It was found that the thickness variation affects isotropic plates a bit more than FGM plates.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.679
|
kci_detailed_000102.xml
|
||
ART002030383
|
oai_dc
|
State detection of explosive welding structure by dual-tree complex wavelet transform based permutation entropy
|
State detection of explosive welding structure by dual-tree complex wavelet transform based permutation entropy
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yue Si(Xi’an Jiaotong University); ZhouSuo Zhang(Xi’an Jiaotong University); Wei Cheng(Xi’an Jiaotong University); FeiChen Yuan(Xi’an Jiaotong University)"
] |
Recent years, explosive welding structures have been widely used in many engineering fields. The bonding state detection of explosive welding structures is significant to prevent unscheduled failures and even catastrophic accidents. However, this task still faces challenges due to the complexity of the bonding interface. In this paper, a new method called dual-tree complex wavelet transform based permutation entropy (DTCWT-PE) is proposed to detect bonding state of such structures. Benefiting from the complex analytical wavelet function, the dual-tree complex wavelet transform (DTCWT) has better shift invariance and reduced spectral aliasing compared with the traditional wavelet transform. All those characters are good for characterizing the vibration response signals. Furthermore, as a statistical measure, permutation entropy (PE) quantifies the complexity of non-stationary signals through phase space reconstruction, and thus it can be used as a viable tool to detect the change of bonding state. In order to more accurate identification and detection of bonding state, PE values derived from DTCWT coefficients are proposed to extract the state information from the vibration response signal of explosive welding structure, and then the extracted PE values serve as input vectors of support vector machine (SVM) to identify the bonding state of the structure. The experiments on bonding state detection of explosive welding pipes are presented to illustrate the feasibility and effectiveness of the proposed method.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.569
|
kci_detailed_000102.xml
|
||
ART002030384
|
oai_dc
|
Fatigue behavior of circular hollow tube and wood filled circular hollow steel tube
|
Fatigue behavior of circular hollow tube and wood filled circular hollow steel tube
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ravindra R. Malagi(Visvesvaraya Technological University); Bharatesh A. Danawade(Visvesvaraya Technological University)"
] |
This paper presents the experimental work on fatigue life and specific fatigue strength of circular hollow sectioned steel tube and wood filled circular hollow section steel tube. Burning effect was observed in the case of circular hollow sectioned steel tube when it is subjected to Maximum bending moment of 19613.30 N-mm at 4200 rpm, but this did not happen in the case of wood filled hollow section. Statistical analysis was done based on the experimental data and relations have been built to predict the number of cycles for the applied stress or vice versa. The relations built in this paper can safely be applied for design of the fatigue life or fatigue strength of circular hollow sections and wood filled hollow sections. Results were validated by static specific bending strengths determined by ANSYS using a known applied load.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.585
|
kci_detailed_000102.xml
|
||
ART002030387
|
oai_dc
|
Investigating the fatigue failure characteristics of A283 Grade C steel using magnetic flux dete
|
Investigating the fatigue failure characteristics of A283 Grade C steel using magnetic flux dete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Arifin(Universiti Kebangsaan Malaysia); W.Z.W. Jusoh(Universiti Kebangsaan Malaysia); S. ABDULLAH(Universiti Kebangsaan Malaysia); N. Jamaluddin(Universiti Kebangsaan Malaysia); A. K. ARIFFIN(Universiti Kebangsaan Malaysia)"
] |
The Metal Magnetic Memory (MMM) method is a non-destructive testing method based on an analysis of the self-magnetic leakage field distribution on the surface of a component. It is used for determining the stress concentration zones or any irregularities on the surface or inside the components fabricated from ferrous-based materials. Thus, this paper presents the MMM signal behaviour due to the application of fatigue loading. A series of MMM data measurements were performed to obtain the magnetic leakage signal characteristics at the elastic, pre-crack and crack propagation regions that might be caused by residual stresses when cyclic loadings were applied onto the A283 Grade C steel specimens. It was found that the MMM method was able to detect the defects that occurred in the specimens. In addition, a justification of the Self Magnetic Flux Leakage patterns is discussed for demonstrating the effectiveness of this method in assessing the A283 Grade C steel under cyclic loadings.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.601
|
kci_detailed_000102.xml
|
||
ART002030388
|
oai_dc
|
Behaviour and design of composite beams subjected to flexure and axial load
|
Behaviour and design of composite beams subjected to flexure and axial load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Brendan Kirkland(The University of New South Wales); Brian Uy(The University of New South Wales)"
] |
Composite steel-concrete beams are used frequently in situations where axial forces are introduced. Some examples include the use in cable-stayed bridges or inclined members in stadia and bridge approach spans. In these situations, the beam may be subjected to any combination of flexure and axial load. However, modern steel and composite construction codes currently do not address the effects of these combined actions. This study presents an analysis of composite beams subjected to combined loadings. An analytical model is developed based on a cross-sectional analysis method using a strategy of successive iterations. Results derived from the model show an excellent agreement with existing experimental results. A parametric study is conducted to investigate the effect of axial load on the flexural strength of composite beams. The parametric study is then extended to a number of section sizes and employs various degrees of shear connection. Design models are proposed for estimating the flexural strength of an axially loaded member with full and partial shear connection.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.615
|
kci_detailed_000102.xml
|
||
ART002030381
|
oai_dc
|
A new higher-order shear and normal deformation theory for functionally graded sandwich beams
|
A new higher-order shear and normal deformation theory for functionally graded sandwich beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Riadh Bennai(Univesité Hassiba Benbouali de Chlef); Abdelouahed Tounsi(University of Sidi Bel Abbes); Hassen Ait Atmane(Univesité Hassiba Benbouali de Chlef)"
] |
A new refined hyperbolic shear and normal deformation beam theory is developed to study the free vibration and buckling of functionally graded (FG) sandwich beams under various boundary conditions. The effects of transverse shear strains as well as the transverse normal strain are taken into account. Material properties of the sandwich beam faces are assumed to be graded in the thickness direction according to a simple power-law distribution in terms of the volume fractions of the constituents. The core layer is still homogeneous and made of an isotropic material. Equations of motion are derived from Hamilton's principle. Analytical solutions for the bending, free vibration and buckling analyses are obtained for simply supported sandwich beams. Illustrative examples are given to show the effects of varying gradients, thickness stretching, boundary conditions, and thickness to length ratios on the bending, free vibration and buckling of functionally graded sandwich beams.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.521
|
kci_detailed_000102.xml
|
||
ART002030394
|
oai_dc
|
New technique for strengthening reinforced concrete beams with composite bonding steel plates
|
New technique for strengthening reinforced concrete beams with composite bonding steel plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Su-hang Yang(Southeast University); Shuang-Yin Cao(Southeast University); Rui-nan Gu(Jiangsu Research Institute of Building Science CO.)"
] |
Composite bonding steel plate (CBSP) is a newly developed type of structure strengthened technique applicable to the existing RC beam. This composite structure is applicable to strengthening the existing beam bearing high load. The strengthened beam consists of two layers of epoxy bonding prestressed steel plates and the RC beam sandwiched in between. The bonding enclosed and prestressed U-shaped steel jackets are applied at the beam sides. This technique is adopted in case of structures with high longitudinal reinforcing bar ratio and impracticable unloading. The prestress can be generated on the strengthening steel plates and jackets by using the CBSP technique before loading. The test results of full-scale CBSP strengthened beams show that the strength and stiffness are enhanced without reduction of their ductility. It is demonstrated that the strain hysteresis effect can be effectively overcome after prestressing on the steel plates by using such technique. The applied plates and jackets can jointly behave together with the existing beam under the action of epoxy bonding and the mechanical anchorage of the steel jackets. The simplified formulas are proposed to calculate the prestress and the ultimate capacities of strengthened beams. The accuracy of formulas was verified with the experimental results.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.735
|
kci_detailed_000102.xml
|
||
ART002030390
|
oai_dc
|
A numerical analysis on the performance of buckling restrained braces at fire-study of the gap filler effect
|
A numerical analysis on the performance of buckling restrained braces at fire-study of the gap filler effect
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Elnaz Talebi(Universiti Teknologi Malaysia); Mahmood Md Tahir(Universiti Teknologi Malaysia); Farshad Zahmatkesh(Universiti Teknologi Malaysia); Ahmad B.H. Kueh(Universiti Teknologi Malaysia)"
] |
Buckling Restrained Braces (BRB) have been widely used in the construction industry as they utilize the most desirable properties of both constituent materials, i.e., steel and concrete. They present excellent structural qualities such as high load bearing capacity, ductility, energy-absorption capability and good structural fire behaviour. The effects of size and type of filler material in the existed gap at the steel core-concrete interface as well as the element's cross sectional shape, on BRB's fire resistance capacity was investigated in this paper. A nonlinear sequentially-coupled thermal-stress three-dimensional model was presented and validated by experimental results. Variation of the samples was described by three groups containing, the steel cores with the same cross section areas and equal yield strength but different materials (metal and concrete) and sizes for the gap. Responses in terms of temperature distribution, critical temperature, heating elapsed time and contraction level of BRB element were examined. The study showed that the superior fire performance of BRB was obtained by altering the filler material in the gap from metal to concrete as well as by increasing the size of the gap. Also, cylindrical BRB performed better under fire conditions compared to the rectangular cross section.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.3.661
|
kci_detailed_000102.xml
|
||
ART002062208
|
oai_dc
|
Wave propagation of a functionally graded beam in thermal environments
|
Wave propagation of a functionally graded beam in thermal environments
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Şeref Doğuşcan Akbaş(Bursa Technical University)"
] |
In this paper, the effect of material-temperature dependent on the wave propagation of a cantilever beam composed of functionally graded material (FGM) under the effect of an impact force is investigated. The beam is excited by a transverse triangular force impulse modulated by a harmonic motion. Material properties of the beam are temperature-dependent and change in the thickness direction. The Kelvin–Voigt model for the material of the beam is used. The considered problem is investigated within the Euler-Bernoulli beam theory by using energy based finite element method. The system of equations of motion is derived by using Lagrange's equations. The obtained system of linear differential equations is reduced to a linear algebraic equation system and solved in the time domain and frequency domain by using Newmark average acceleration method. In order to establish the accuracy of the present formulation and results, the comparison study is performed with the published results available in the literature. Good agreement is observed. In the study, the effects of material distributions and temperature rising on the wave propagation of the FGM beam are investigated in detail.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1421
|
kci_detailed_000102.xml
|
||
ART002062209
|
oai_dc
|
Response modification factor of mixed structures
|
Response modification factor of mixed structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nader Fanaie(K.N.Toosi University of Technology); Shahab O. Shamlou(K.N.Toosi University of Technology)"
] |
Mixed structures consist of two parts: a lower part and an upper part. The lower part is usually made of concrete while the upper part is made of steel. Analyzing these structures is complicated and code-based design of them has many associated problems. In this research, the seismic behavior of mixed structures which have reinforced concrete frames and shear walls in their lower storeys and steel frames with bracing in their upper storeys were studied. For this purpose, seventeen structures in three groups of 5, 9 and 15 storey structures with different numbers of concrete and steel storeys were designed. Static pushover analysis, linear dynamic analysis and incremental dynamic analysis (IDA) using 15 earthquake records were performed by OpenSees software. Seismic parameters such as period, response modification factor and ductility factor were then obtained for the mixed (hybrid) structures using more than 4600 nonlinear dynamic analysis and used in the regression analysis for achieving proper formula. Finally, some formulas, effective in designing such structures, are presented for the mentioned parameters. According to the results obtained from this research, the response modification factor values of mixed structures are lower compared to those of steel or concrete ones with the same heights. This fact might be due to the irregularities of stiffness, mass, etc., at different heights of the structure. It should be mentioned that for the first time, the performance and seismic response of such structures were studied against real earthquake accelerations using nonlinear dynamic analysis, andresponse modification factor was obtained by IDA.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1449
|
kci_detailed_000102.xml
|
||
ART002062210
|
oai_dc
|
Development of new predictive analysis in the orthogonal metal cutting process by utilization of Oxley's machining theory
|
Development of new predictive analysis in the orthogonal metal cutting process by utilization of Oxley's machining theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abdelkader Karas(Khemis Miliana University); Mohamed Bouzit(Oran University of Science and Technolog); Mustapha Belarbi(University of Tiaret); Redha Mazouzi(Khemis Miliana University)"
] |
This paper presents a contribution to improving an analytical thermo-mechanical modeling of Oxley's machining theory of orthogonal metals cutting, which objective is the prediction of the cutting forces, the average stresses, temperatures and the geometric quantities in primary and secondary shear zones. These parameters will then be injected into the developed model of Karas et al. (2013) to predict temperature distributions at the tool-chip-workpiece interface. The amendment to Oxley's modified model is the reduction of the estimation of time-related variables cutting process such as cutting forces, temperatures in primary and secondary shear zones and geometric variables by the introduction the constitutive equation of Johnson-Cook model. The model-modified validation is performed by comparing some experimental results with the predictions for machining of 0.38% carbon steel.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1467
|
kci_detailed_000102.xml
|
||
ART002062212
|
oai_dc
|
Change of transmission characteristics of FSSs in hybrid composites due to residual stresses
|
Change of transmission characteristics of FSSs in hybrid composites due to residual stresses
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"황인한(연세대학교); 전흥재(연세대학교); 홍익표(공주대학교); 박용배(아주대학교); 김윤재(Agency for Defence Development)"
] |
The frequency selective surface (FSS) embedded hybrid composite materials have been developed to provide excellent mechanical and specific electromagnetic properties. Radar absorbing structures (RASs) are an example material that provides both radar absorbing properties and structural characteristics. The absorbing efficiency of an RAS can be improved using selected materials having special absorptive properties and structural characteristics and can be in the form of multi-layers or have a certain stacking sequence. However, residual stresses occur in FSS embedded composite structures after co-curing due to a mismatch between the coefficients of thermal expansion of the FSS and the composite material. In this study, to develop an RAS, the thermal residual stresses of FSS embedded composite structures were analyzed using finite element analysis, considering the effect of stacking sequence of composite laminates with square loop (SL) and double square loop (DSL) FSS patterns. The FSS radar absorbing efficiency was measured in the K-band frequency range of 21.6 GHz. Residual stress leads to a change in the deformation of the FSS pattern. Using these results, the effect of transmission characteristics with respect to the deformation on FSS pattern was analyzed using an FSS Simulator.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1501
|
kci_detailed_000102.xml
|
||
ART002062213
|
oai_dc
|
Confinement of concrete in two-chord battened composite columns
|
Confinement of concrete in two-chord battened composite columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Elżbieta Szmigiera(Warsaw University of Technology)"
] |
This article provides an analysis of the complex character of stress distribution in concrete in stub columns consisting of two HE160A steel sections held together with batten plates and filled with concrete. In such columns, evaluating the effect of concrete confinement and determining the extent of this confinement constitute a substantially complex problem. The issue was considered in close correspondence to rectangular cross section tubular elements filled with concrete, concrete-encased columns, as well as to steel-concrete columns in which reinforcement bars are connected with shackles. In the analysis of concrete confinement in two-chord columns, elements of computational methods developed for different types of composite cross sections were adopted. The achieved analytical results were compared with calculations based on test results.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1511
|
kci_detailed_000102.xml
|
||
ART002062203
|
oai_dc
|
Higher order static analysis of truncated conical sandwich panels with flexible cores
|
Higher order static analysis of truncated conical sandwich panels with flexible cores
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Keramat Malekzadeh Fard(Malek Ashtar University of Technology)"
] |
A higher order analytical solution for static analysis of a truncated conical composite sandwich panel subjected to different loading conditions was presented in this paper which was based on a new improved higher order sandwich panel theory. Bending analysis of sandwich structures with flexible cores subjected to concentrated load, uniform distributed load on a patch, harmonic and uniform distributed loads on the top and/or bottom face sheet of the sandwich structure was also investigated. For the first time, bending analysis of truncated conical composite sandwich panels with flexible cores was performed. The governing equations were derived by principle of minimum potential energy. The first order shear deformation theory was used for the composite face sheets and for the core while assuming a polynomial description of the displacement fields. Also, the in-plane hoop stresses of the core were considered. In order to assure accuracy of the present formulations, convergence of the results was examined. Effects of types of boundary conditions, types of applied loads, conical angles and fiber angles on bending analysis of truncated conical composite sandwich panels were studied. As, there is no research on higher order bending analysis of conical sandwich panels with flexible cores, the results were validated by ABAQUS FE code. The present approach can be linked with the standard optimization programs and it can be used in the iteration process of the structural optimization. The proposed approach facilitates investigation of the effect of physical and geometrical parameters on the bending response of sandwich composite structures.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1333
|
kci_detailed_000103.xml
|
||
ART002062214
|
oai_dc
|
Relationship between Barcol hardness and flexural modulus degradation of composite sheets subjected to flexural fatigue
|
Relationship between Barcol hardness and flexural modulus degradation of composite sheets subjected to flexural fatigue
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Raif Sakin(Balıkesir University)"
] |
The aim of this study is to investigate the relationship between Barcol hardness (H) and flexural modulus (E) degradation of composite sheets subjected to flexural fatigue. The resin transfer molding (RTM) method was used to produce 3-mm-thick composite sheets with fiber volume fraction of 44%. The composite sheets were subjected to flexural fatigue tests and Barcol scale hardness measurements. After these tests, the stiffness and hardness degradations were investigated in the composite sheets that failed after around one million cycles (stage III). Flexural modulus degradation values were in the range of 0.41-0.42 with the corresponding measured hardness degradation values in the range of 0.25-0.32 for the all fatigued composite sheets. Thus, a 25% reduction in the initial hardness and a 41% reduction in the initial flexural modulus can be taken as the failure criteria. The results showed that a reasonably well-defined relationship between Barcol hardness and flexural modulus degradation in the distance range.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1531
|
kci_detailed_000103.xml
|
||
ART002062204
|
oai_dc
|
Experiments on locally dented conical shells under axial compression
|
Experiments on locally dented conical shells under axial compression
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tohid Ghanbari Ghazijahani(University of Tasmania); Hui Jiao(University of Tasmania); Damien Holloway(University of Tasmania)"
] |
Steel conical shells have long been used in various parts of different structures. Sensitivity to the initial geometrical imperfection has been one of the most significant issues on the stability of these structures, which has made them highly vulnerable to the buckling. Most attention has been devoted to structures under normal fabrication related imperfections. Notwithstanding, the challenges of large local imperfections- herein as dent-shaped imperfections - have not been a focus yet for these structures. This study aims to provide experimental data on the effect of such imperfections on the buckling capacity of these shells under axial compression. The results show changes in the buckling mode and the capacity for such damaged thin specimens as is outlined in this paper, with an average overall capacity reduction of 11%.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1355
|
kci_detailed_000103.xml
|
||
ART002062215
|
oai_dc
|
Fatigue crack effect on magnetic flux leakage for A283 grade C steel
|
Fatigue crack effect on magnetic flux leakage for A283 grade C steel
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.I.M. Ahmad(Universiti Kebangsaan Malaysia); A. Arifin(Universiti Kebangsaan Malaysia); S. ABDULLAH(Universiti Kebangsaan Malaysia); W.Z.W. Jusoh(Universiti Kebangsaan Malaysia); S.S.K. Singh(Universiti Kebangsaan Malaysia)"
] |
This paper presents the characterization of fatigue crack in the A283 Grade C steel using the MMM method by identifying the effects of magnetic flux leakage towards the crack growth rate, da/dN, and crack length.The previous and current research on the relation between MMM parameters and fatigue crack effect is still unclear and requires specific analysis to validate that. This method is considered to be a passive magnetic method among other Non-Destructive Testing (NDT) methods. The tension-tension fatigue test was conducted with a testing frequency of 10 Hz with 4 kN loaded, meanwhile the MMM response signals were captured using a MMM instrument. A correlation between the crack growth rate and magnetic flux leakage produces a sigmoid shape curve with a constant values which present the gradient, m value is in the ranges of 1.4357 to 4.0506, and the y-intercept, log C in the ranges of 4×10<SUP>-7</SUP> to 0.0303. Moreover, a linear relation was obtained between the crack length and magnetic flux leakage which present the R-Squared values is at 0.830 to 0.978. Therefore, MMM method has their own capability to investigate and characterize the fatigue crack effects as a main source of fracture mechanism for ferrous-based materials.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1549
|
kci_detailed_000103.xml
|
||
ART002062217
|
oai_dc
|
Seismic behavior of steel reinforced concrete (SRC) joints with new-type section steel under cyclic loading
|
Seismic behavior of steel reinforced concrete (SRC) joints with new-type section steel under cyclic loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Qiuwei Wang(Xi’an University of Architecture and Technology); Qingxuan Shi(Xi’an University of Architecture and Tec); Hehe Tian(Xi’an University of Architecture and Tec)"
] |
No significant improvement has been observed on the seismic performance of the ordinary steel reinforced concrete (SRC) columns compared with the reinforced concrete (RC) columns mainly because I, H or core cross-shaped steel cannot provide sufficient confinement for core concrete. Two improved SRC columns by constructing with new-type section steel were put forward on this background: a cross-shaped steel whose flanges are in contact with concrete cover by extending the geometry of webs, and a rotated cross-shaped steel whose webs coincide with diagonal line of the column's section. The advantages of new-type SRC columns have been proved theoretically and experimentally, while construction measures and seismic behavior remain unclear when the new-type columns are joined onto SRC beams. Seismic behavior of SRC joints with new-type section steel were experimentally investigated by testing 5 specimens subjected to low reversed cyclic loading, mainly including the failure patterns, hysteretic loops, skeleton curves, energy dissipation capacity, strength and stiffness degradation and ductility. Effects of steel shape, load angel and construction measures on seismic behavior of joints were also analyzed. The test results indicate that the new-type joints display shear failure pattern under seismic loading, and steel and concrete of core region could bear larger load and tend to be stable although the specimens are close to failure. The hysteretic curves of new-type joints are plumper whose equivalent viscous damping coefficients and ductility factors are over 0.38 and 3.2 respectively, and this illustrates the energy dissipation capacity and deformation ability of new-type SRC joints are better than that of ordinary ones with shear failure. Bearing capacity and ductility of new-type joints are superior when the diagonal cross-shaped steel is contained and beams are orthogonal to columns, and the two construction measures proposed have little effect on the seismic behavior of joints.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1561
|
kci_detailed_000103.xml
|
||
ART002062205
|
oai_dc
|
The influence of production inconsistencies on the functional failure of GRP pipes
|
The influence of production inconsistencies on the functional failure of GRP pipes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Roham Rafiee(University of Tehran); Mahdi Fakoor(University of Tehran); Hadi Hesamsadat(University of Tehran)"
] |
In this study, a progressive damage modeling is developed to predict functional failure pressure of GRP pipes subjected to internal hydrostatic pressure. The modeling procedure predicts both first-ply failure pressure and functional failure pressure associated with the weepage phenomenon. The modeling procedure is validated using experimental observations. The random parameters attributed to the filament winding production process are identified. Consequently, stochastic simulation is conducted to investigate the influence of induced inconsistencies on the functional failure pressures of GRP pipes. The obtained results are compared to realize the degree to which random parameters affect the performance of the pipe in operation.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1369
|
kci_detailed_000103.xml
|
||
ART002062218
|
oai_dc
|
Structural behavior of inverted V-braced frames reinforced with non-welded buckling restrained braces
|
Structural behavior of inverted V-braced frames reinforced with non-welded buckling restrained braces
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김선희(서울대학교); 최성모(서울시립대학교)"
] |
A concentric braced steel frame is a very efficient structural system because it requires relatively smaller amount of materials to resist lateral forces. However, primarily developed as a structural system to resist wind loads based on an assumption that the structure behaves elastically, a concentric braced frame possibly experiences the deterioration in energy dissipation after brace buckling and the brittle failure of braces and connections when earthquake loads cause inelastic behavior. Consequently, plastic deformation is concentrated in the floor where brace buckling occurs first, which can lead to the rupture of the structure. This study suggests reinforcing H-shaped braces with non-welded cold-formed stiffeners to restrain flexure and buckling and resist tensile force and compressive force equally. Weak-axis reinforcing members (2 pieces) developed from those suggested in previous studies (4 pieces) were used to reinforce the H-shaped braces in an inverted V-type braced frame. Monotonic loading tests, finite element analysis and cyclic loading tests were carried out to evaluate the structural performance of the reinforced braces and frames. The reinforced braces satisfied the AISC requirement. The reinforcement suggested in this study is expected to prevent the rupture of beams caused by the unbalanced resistance of the braces.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1581
|
kci_detailed_000103.xml
|
||
ART002062206
|
oai_dc
|
Improvement of the behaviour of composite slabs: A new type of end anchorage
|
Improvement of the behaviour of composite slabs: A new type of end anchorage
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Alexandre Fonseca(University of Coimbra); Rui Simões(University of Coimbra); Bruno Marques(University of Coimbra)"
] |
The application of composite steel-concrete slabs with profiled steel sheeting has increased, due to the various advantages in relation to reinforced concrete slabs such as, the reduced thickness, the reduced amount of lost formwork needed, as well as the speed of execution. The loss of longitudinal shear resistance is, generally, the governing design mode for simply supported spans of common lengths. For common distributed loadings, the composite behaviour is influenced by the partial shear connection between the concrete and the steel sheeting. The present research work is intended to contribute to improving the ultimate limit state behaviour of composite slabs using end anchorage. Eurocode 4, Part 1.1 (EN 1994-1-1) provides an analytical methodology for predicting the increase of longitudinal resistance, achieved by using shear studs welded through the steel sheeting as the end anchorage mechanism. The code does not supply an analytical methodology for other kinds of end anchorage so, additional tests or studies are needed to prove the effectiveness of these types of anchorage. The influence of end anchorage mechanisms provided by transverse rebars at the ends of simply supported composite slabs is analysed in this paper. Two experimental programmes were carried out, the first to determine the resistance provided by the new end anchorage mechanism and the second to analyse its influence on the behaviour of simply supported composite slabs.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1381
|
kci_detailed_000103.xml
|
||
ART002062219
|
oai_dc
|
Experimental study on innovative sections for cold formed steel beams
|
Experimental study on innovative sections for cold formed steel beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.A. Dar(Kurukshetra University); M. Yusuf(NIT Srinagar); A.R. Dar(NIT Srinagar); J. Raju(Kurukshetra University)"
] |
Cold Formed Steel members are widely used in today&'s construction industry. However the structural behavior of light gauge high strength cold formed steel sections characterized by various buckling modes are not yet fully understood. Because of their simple forming and easy connections, the commonly used cold formed sections for beams are C and Z. However both these sections suffer from certain buckling modes. To achieve much improved structural performance of cold formed sections for beams both in terms of strength and stiffness, it is important to either delay or completely eliminate their various modes of buckling. This paper presents various innovative sectional profiles and stiffening arrangements for cold formed steel beams which would successfully contribute in delaying or eliminating various modes of premature buckling, thus considerably improving the load carrying capacity as well as stiffness characteristics of such innovative cold formed sections compared to conventional cold formed steel sections commonly used for beams.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1599
|
kci_detailed_000103.xml
|
||
ART002062207
|
oai_dc
|
Racking shear resistance of steel frames with corner connected precast concrete infill panels
|
Racking shear resistance of steel frames with corner connected precast concrete infill panels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J.C.D. Hoenderkamp(Eindhoven University of Technology); H.H. Snijder(Eindhoven University of Technology, Eindhoven); H. Hofmeyer(Eindhoven University of Technology, Eindhoven)"
] |
When precast concrete infill panels are connected to steel frames at discrete locations, interaction at the structural interface is neither complete nor absent. The contribution of precast concrete infill panels to the lateral stiffness and strength of steel frames can be significant depending on the quality, quantity and location of the discrete interface connections. This paper presents preliminary experimental and finite element results of an investigation into the composite behaviour of a square steel frame with a precast concrete infill panel subject to lateral loading. The panel is connected at the corners to the ends of the top and bottom beams. The Frame-to-Panel-Connection, FPC4 between steel beam and concrete panel consists of two parts. A T-section with five achor bars welded to the top of the flange is cast in at the panel corner at a forty five degree angle. The triangularly shaped web of the T-section is reinforced against local buckling with a stiffener plate. The second part consists of a triangular gusset plate which is welded to the beam flange. Two bolts acting in shear connect the gusset plate to the web of the T-section. This way the connection can act in tension or compression. Experimental pull-out tests on individual connections allowed their load deflection characteristics to be established. A full scale experiment was performed on a one-storey one-bay 3 by 3 m infilled frame structure which was horizontally loaded at the top. With the characteristics of the frame-to-panel connections obtained from the experiments on individual connections, finite element analyses were performed on the infilled frame structures taking geometric and material non-linear behaviour of the structural components into account. The finite element model yields reasonably accurate results. This allows the model to be used for further parametric studies.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1403
|
kci_detailed_000103.xml
|
||
ART002062670
|
oai_dc
|
Ultimate strength of long-span buildings with P.E.B (Pre-Engineered Building) system
|
Ultimate strength of long-span buildings with P.E.B (Pre-Engineered Building) system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이성휘(한국특허청); 최성모(서울시립대학교); 김영호(Jiseung Consultant Co., Ltd.)"
] |
With the improvement of the quality of construction materials and the development of construction technologies, large-scale long-span steel frame buildings have been built recently. The P.E.B system using tapered members is being employed as an economically-efficient long-span structure owing to its advantage of being able to distribute stress appropriately depending on the size of sectional areas of members. However, in December 2005 and in February 2014, P.E.B buildings collapsed due to sudden loads such as snow loads and wind gusts. In this study, the design and construction of the P.E.B system in Korea were analyzed and its structural safety was evaluated using the finite element analysis program to suggest how to improve the P.E.B system in order to promote the efficient and rational application of the system.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.6.1483
|
kci_detailed_000103.xml
|
||
ART001957262
|
oai_dc
|
Axial behaviour of rectangular concrete-filled cold-formed steel tubular columns with different loading methods
|
Axial behaviour of rectangular concrete-filled cold-formed steel tubular columns with different loading methods
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiushu Qu(Beijing University of Civil Engineering and Architecture); Zhi-Hua Chen(Tianjin University); Guo-Jun Sun(Tianjin University)"
] |
Axial compression tests have been carried out on 18 rectangular concrete-filled cold-formed steel tubular (CFST) columns with the aim of investigating the axial behaviour of rectangular CFST columns under different loading methods (steel loaded-first and full-section loaded methods). The influence of different loading methods on the ultimate strength of the specimens was compared and the development of Poisson's Ratio as it responds to an increasing load was reported and analysed. Then, the relationship between the constraining factor and the strength index, and the relationship between the constraining factor and ductility index of the specimens, were both discussed. Furthermore, the test results of the full-section loaded specimens were compared with five international code predicted values, and an equation was derived to predict the axial carrying capacity for rectangular CFST columns with a steel loaded-first loading method.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.18.1.071
|
kci_detailed_000103.xml
|
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