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ART001998546
|
oai_dc
|
Analysis of composite steel-concrete beams using a refined high-order beam theory
|
Analysis of composite steel-concrete beams using a refined high-order beam theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Lezgy-Nazargah(Hakim Sabzevari University); L. Kafi(Hakim Sabzevari University)"
] |
A finite element model is presented for the analysis of composite steel-concrete beams based on a refined high-order theory. The employed theory satisfies all the kinematic and stress continuity conditions at the layer interfaces and considers effects of the transverse normal stress and transverse flexibility. The global displacement components, described by polynomial or combinations of polynomial and exponential expressions, are superposed on local ones chosen based on the layerwise or discrete-layer concepts. The present finite model does not need the incorporating any shear correction factor. Moreover, in the present C1-continuous finite element model, the number of unknowns is independent of the number of layers. The proposed finite element model is validated by comparing the present results with those obtained from the three-dimensional (3D) finite element analysis. In addition to correctly predicting the distribution of all stress components of the composite steel-concrete beams, the proposed finite element model is computationally economic.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.18.6.1353
|
kci_detailed_000101.xml
|
||
ART001998547
|
oai_dc
|
Static behaviour of lying multi-stud connectors in cable-pylon anchorage zone
|
Static behaviour of lying multi-stud connectors in cable-pylon anchorage zone
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhaofei Lin(Tongji University); Yuqing Liu(Tongji University); Jun He(Changsha University of Science and Techn)"
] |
In order to investigate the behaviour of lying multi-stud connectors in cable-pylon anchorage zone, twenty-four push-out tests are carried out with different stud numbers and diameters. The effect of concrete block width and tensile force on shear strength is investigated using the developed and verified finite element model. The results show that the shear strength of the lying multi-stud connectors is reduced in comparison with the lying single-stud connector. The reduction increases with the increasing of the number of studs in the vertical direction. The influence of the stud number on the strength reduction of the lying multi-stud connectors is decreased under combined shear and tension loads compared with under pure shear. Yet, due to multi-stud effect, they still can't be ignored. The concrete block width has a non-negligible effect on the shear strength of the lying multi-stud connectors and therefore should be chosen properly when designing push-out specimens. No obvious difference is observed between the strength reductions of the studs with 22 mm and 25 mm diameters. The shear strengths obtained from the tests are compared with those predicted by AASHTO LRFD and Eurocode 4. Eurocode 4 generally gives conservative predictions of the shear strength, while AASHTO LRFD overestimates the shear strength. In addition, the lying multi-stud connectors with the diameters of 22 m and 25 mm both exhibit adequate ductility according to Eurocode 4. An expression of load-slip curve is proposed for the lying multi-stud connectors and shows good agreement with the test results.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.18.6.1369
|
kci_detailed_000101.xml
|
||
ART001998548
|
oai_dc
|
Static analysis of a radially retractable hybrid grid shell in the closed position
|
Static analysis of a radially retractable hybrid grid shell in the closed position
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jianguo Cai(Southeast University); Chao Jiang(Southeast University); Xiaowei Deng(University of California); Jianfeng Zhao(Southeast University); Yixiang Xu(Strathclyde University)"
] |
A radially retractable roof structure based on the concept of the hybrid grid shell is proposed in this paper. The single-layer steel trusses of the radially foldable bar structure are diagonally stiffened by cables, which leads to a single-layer lattice shell with triangular mesh. Then comparison between the static behavior between the retractable hybrid grid shell and the corresponding foldable bar shell with quadrangular mesh is discussed. Moreover, the effects of different structural parameters, such as the rise-to-span ratio, the bar cross section area and the pre-stress of the cables, on the structural behaviors are investigated. The results show that prestressed cables can strengthen the foldable bar shell with quadrangular mesh. Higher structural stiffness is anticipated by introducing cables into the hybrid system. When the rise-span ratio is equal to 0.2, where the joint displacement reaches the minimal value, the structure shape of the hyrbid grid shell approaches the reasonable arch axis. The increase of the section of steel bars contributes a lot to the integrity stiffness of the structure. Increasing cable sections would enhance the structure stiffness, but it contributes little to axial forces in structural members. And the level of cable prestress has slight influence on the joint displacements and member forces.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.18.6.1391
|
kci_detailed_000101.xml
|
||
ART001998549
|
oai_dc
|
Design and analysis of non-linear space frames with semi-rigid connections
|
Design and analysis of non-linear space frames with semi-rigid connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Merve Sagiroglu(Erzurum Technical University); Abdulkadir Cuneyt Aydin(Ataturk University)"
] |
Semi-rigid connections are the actual behavior of beam-to-column connections in steel frames. However, the behavior of semi-rigid connections is not taken into account for the simplicity in the conventional analysis and design of steel frames. A computer-based analysis and design has been studied for the three-dimensional steel frames with semi-rigid connections. The nonlinear analysis which includes the effects of the flexibility of connections is used for this study. It is designed according to the buckling and combined stress constraints under the present loading after the joint deformations and the member end forces of the space frame are determined by the stiffness matrix method. The semi-rigid connection type is limited to the top and bottom angles with a double web angle connection. The Frye-Morris polynomial model is used to describe the non-linear behavior of semi-rigid connections. Various design examples are presented to demonstrate the efficiency of the method. The results of design and analysis of unbraced semi-rigid frames are compared to the results of unbraced rigid frames under the same design requirements.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.18.6.1405
|
kci_detailed_000101.xml
|
||
ART001998550
|
oai_dc
|
Experimental study on standard and innovative bolted end-plate beam-to-beam joints under bending
|
Experimental study on standard and innovative bolted end-plate beam-to-beam joints under bending
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Levente Katula(Budapest University of Technology and Economics); László Dunai(Budapest University of Technology and Economics)"
] |
The paper presents the details and results of an experimental study on bolted end-plate joints of industrial type steel building frames. The investigated joints are commonly used in Lindab-Astron industrial buildings and are optimized for manufacturing, erection and durability. The aim of the research was to provide an experimental background for the design model development by studying load-bearing capacity of joints, bolt force distribution, and end-plate deformations. Because of the special joint details, (i.e., joints with four bolts in one bolt-row and HammerHead arrangements), the Eurocode 3 standardized component model had to be improved and extended. The experimental programme included six different end-plate and bolt arrangements and covered sixteen specimens. The steel grade of test specimens was S355, the bolt diameter M20, whereas the bolt grade was 8.8 and 10.9 for the two series. The end-plate thickness varied between 12 mm and 24 mm. The specimens were investigated under pure bending conditions using a four-point-bending test arrangement. In all tests the typical displacements and the bolt force distribution were measured. The end-plate plastic deformations were measured after the tests by an automatic measuring device. The measured data were presented and evaluated by the moment-bolt-row force and momentdistance from centre of compression diagrams and by the deformed end-plate surfaces. From the results the typical failure modes and the joint behaviour were specified and presented. Furthermore the influence of the end-plate thickness and the pretension of the bolts on the behaviour of bolted joints were analysed.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.18.6.1423
|
kci_detailed_000101.xml
|
||
ART001998551
|
oai_dc
|
A study on the structural performance of new shape built-up square column under concentric axial load
|
A study on the structural performance of new shape built-up square column under concentric axial load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김선희(서울시립대학교); 최성모(서울시립대학교); Kyong-Soo Yom(Harmony Engineering)"
] |
Recently, in recognition of their outstanding structural performance, the use of Concrete Filled Steel Tube (CFT) columns has been increased. New shape welded built-up square tube was developed by the authors for broader usability using thin steel plates which were bent to be L-shaped (Channel) and each unit members were welded to form square steel tube as an cost-efficient use of expensive steel. In addition, since the rib placed at the center of the tube width acts as an anchor; higher load capacity of buckling is achievable. In order to apply the new shape built-up square columns, the structural behavior and stress distribution with parameter width of thickness (b/t), with and without rib were predicted. The New shape welded built-up square tube effectively delayed the local buckling of the steel tube, which led to a greater strength and ductility than regular HSS.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.18.6.1451
|
kci_detailed_000101.xml
|
||
ART001998552
|
oai_dc
|
Dynamic load concentration caused by a break in a Lamina with viscoelastic matrix
|
Dynamic load concentration caused by a break in a Lamina with viscoelastic matrix
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Arash Reza(Islamic Azad University); Hamid M. Sedighi(Shahid Chamran University of Ahvaz); Mahdi Soleimani(Islamic Azad University)"
] |
The effect of cutting off fibers on transient load in a polymeric matrix composite lamina was studied in this paper. The behavior of fibers was considered to be linear elastic and the matrix behavior was considered to be linear viscoelastic. To model the viscoelastic behavior of matrix, a three parameter solid model was employed. To conduct this research, finite difference method was used. The governing equations were obtained using Shear-lag theory and were solved using boundary and initial conditions before and after the development of break. Using finite difference method, the governing integro-differential equations were developed and normal stress in the fibers is obtained. Particular attention is paid the dynamic overshoot resulting when the fibers are suddenly broken. Results show that considering viscoelastic properties of matrix causes a decrease in dynamic load concentration factor and an increase in static load concentration factor. Also with increases the number of broken fibers, trend of increasing load concentration factor decreases gradually. Furthermore, the overshoot of load in fibers adjacent to the break in a polymeric matrix with high transient time is lower than a matrix with lower transient time, but the load concentration factor in the matrix with high transient time is lower.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.18.6.1465
|
kci_detailed_000101.xml
|
||
ART001998553
|
oai_dc
|
Stress distribution on the real corrosion surface of the orthotropic steel bridge deck
|
Stress distribution on the real corrosion surface of the orthotropic steel bridge deck
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shigenobu Kainuma(Kyushu University); 정영수(Kyushu University); 안진희(경남과학기술대학교)"
] |
This study evaluated the localized stress condition of the real corroded deck surface of an orthotropic steel bridge because severe corrosion damage on the deck surface and fatigue cracking were reported. Thus, a three-dimensional finite element (FE) analysis model was created based on measurements of the corroded orthotropic steel deck surface to examine the stress level dependence on the corrosion condition. Based on the FE analysis results, it could be confirmed that a high stress concentration and irregular stress distribution can develop on the deck surface. The stress level was also increased by approximately 1.3-1.5times as a result of the irregular corroded surface. It was concluded that this stress concentration could increase the possibility of fatigue cracking in the deck surface because of the surface roughness of the orthotropic steel bridge deck.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.18.6.1479
|
kci_detailed_000101.xml
|
||
ART001998554
|
oai_dc
|
Thermal stresses and deflections of functionally graded sandwich plates using a new refined hyperbolic shear deformation theory
|
Thermal stresses and deflections of functionally graded sandwich plates using a new refined hyperbolic shear deformation theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali Bouchafa(University of Sidi Bel Abbes); Abdelouahed Tounsi(University of Sidi Bel Abbes); Mohamed Bachir Bouiadjra(University of Sidi Bel Abbes); Mohammed Sid Ahmed Houari(University of Sidi Bel Abbes)"
] |
A new refined hyperbolic shear deformation theory (RHSDT), which involves only four unknown functions as against five in case of other shear deformation theories, is presented for the thermoelastic bending analysis of functionally graded sandwich plates. Unlike any other theory, the number of unknown functions involved is only four, as against five in case of other shear deformation theories. The theory presented is variationally consistent, does not require shear correction factor, and gives rise to transverse shear stress variation such that the transverse shear stresses vary parabolically across the thickness satisfying shear stress free surface conditions. The sandwich plate faces are assumed to have isotropic, two-constituent material distribution through the thickness, and the modulus of elasticity, Poisson's ratio of the faces, and thermal expansion coefficients are assumed to vary according to a power law distribution in terms of the volume fractions of the constituents. The core layer is still homogeneous and made of an isotropic ceramic material. Several kinds of sandwich plates are used taking into account the symmetry of the plate and the thickness of each layer. The influences played by the transverse shear deformation, thermal load, plate aspect ratio and volume fraction distribution are studied. Numerical results for deflections and stresses of functionally graded metal-ceramic plates are investigated. It can be concluded that the proposed theory is accurate and simple in solving the thermoelastic bending behavior of functionally graded plates.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.18.6.1493
|
kci_detailed_000101.xml
|
||
ART001998555
|
oai_dc
|
Seismic performance of eccentrically braced frames with high strength steel combination
|
Seismic performance of eccentrically braced frames with high strength steel combination
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ming Lian(Xi’an University of Architecture and Technology); Mingzhou Su(Xi’an University of Architecture and Tec); Yan Guo(Xi’an University of Architecture and Tec)"
] |
Eccentrically braced frames (EBFs) often use conventional steel with medium yield strength. This system requires structural members with large cross-sections for well seismic behavior, which leads to increased material costs. In eccentrically braced frames with high strength steel combination (HSS-EBFs), links use Q345 steel (specified nominal yield strength 345 MPa), braces use Q345 steel or high strength steel while other structural members use high strength steel (e.g., steel Q460 with the nominal yield strength of 460 MPa or steel Q690 with the nominal yield strength of 690 MPa). For this approach can result in reduced steel consumption and increased economic efficiency. Several finite element models of both HSS-EBFs and EBFs are established in this paper. Nonlinear hysteretic analyses and nonlinear time history analyses are conducted to compare seismic performance and economy of HSS-EBFs versus EBFs. Results indicate that the seismic performance of HSS-EBFs is slightly poorer than that of EBFs under the same design conditions, and HSS-EBFs satisfy seismic design codes and reduce material costs.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.18.6.1517
|
kci_detailed_000101.xml
|
||
ART001998556
|
oai_dc
|
FGM micro-gripper under electrostatic and intermolecular Van-der Waals forces using modified couple stress theory
|
FGM micro-gripper under electrostatic and intermolecular Van-der Waals forces using modified couple stress theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Reza Jahangiri(Islamic Azad University); Hadi Jahangiri(Islamic Azad University); Hamed Khezerloo(Islamic Azad University)"
] |
In this paper mechanical behavior of the functional gradient materials (FGM) micro-gripper under thermal load and DC voltage is numerically investigated taking into account the effect of intermolecular forces. In contrary to the similar previous works, which have been conducted for homogenous material, here, the FGM material has been implemented. It is assumed that the FGM micro-gripper is made of metal and ceramic and that material properties are changed continuously along the beam thickness according to a given function. The nonlinear governing equations of the static and dynamic deflection of microbeams have been derived using the coupled stress theory. The equations have been solved using the Galerkin based step-by-step linearization method (SSLM). The solution procedure has been evaluated against available data of literature showing good agreement. A parametric study has been conducted, focusing on the combined effects of important parameters included DC voltage, temperature variation, geometrical dimensions and ceramic volume concentration on the dynamic response and stability of the FGM micro-gripper.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.18.6.1541
|
kci_detailed_000101.xml
|
||
ART001998557
|
oai_dc
|
Pushover analysis of gabled frames with semi-rigid connections
|
Pushover analysis of gabled frames with semi-rigid connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ahmad Shooshtari(Ferdowsi University of Mashhad); Sina Heyrani Moghaddam(Ferdowsi University of Mashhad); Amir R. Masoodi(Ferdowsi University of Mashhad)"
] |
The nonlinear static analysis of structure, which is under the effect of lateral loads and provides the capacity curve of the structure, is defined as a push-over analysis. Ordinarily, by using base shear and the lateral displacement of target point, the capacity curve is obtained. The speed and ease of results interpretation in this method is more than that of the NRHA responses. In this study, the nonlinear static analysis is applied on the semi-rigid steel gabled frames. It should be noted that the members of this structure are analyzed as a prismatic beam-column element in two states of semi-rigid connections and supports. The gabled frame is modeled in the OpenSees software and analyzed based on the displacement control at the target point. The lateral displacement results, calculated in the top level of columns, are reported. Furthermore, responses of the structure are obtained for various support conditions and the rigidity of nodal connections. Ultimately, the effect of semi-rigid connections and supports on the capacity and the performance point of the structure are presented in separated graphs.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.18.6.1557
|
kci_detailed_000101.xml
|
||
ART001887575
|
oai_dc
|
Effect of plate properties on shear strength of bolt group in single plate connection
|
Effect of plate properties on shear strength of bolt group in single plate connection
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Aphinat Ashakul(King Mongkut's University of Technology Thonbu); Kriangkrai Khampa(King Mongkut's University of Technol)"
] |
A single plate shear connection, or shear tab, is a very popular shear connection due to its merit in ease of construction and material economy. However, problems in understanding the connection behavior, both in terms of strength and ductility, have been well-documented. Suggestions or design model for single plate connections in AISC Design Manual have been altered several times, with the latest edition settling down to giving designers pre-calculated design strength tables if the connection details agree with given configurations. Results from many full-scale tests and finite element models in the past suggest that shear strength of a bolt group in single plate shear connections might be affected by yield strength of plate material; therefore, this research was aimed to investigate and clarify effects of plate yield strength and thickness on shear strength of the bolt group in the connections, including the validity of using a plate thickness/bolt diameter ratio (tp/db) in design, by using finite element models. More than 20 models have been created by using ABAQUS program with 19.0- and 22.2-mm A325N bolts and A36 and Gr.50 plates with various thicknesses. Results demonstrated that increase of plate thickness or plate yield strength, with the tp/db ratio remained intact, could significantly reduce shear strength of the bolt group in the connection as much as 15 percent. Results also confirmed that the tp/db ratio is a valid indicator to be used for guaranteeing strength sufficiency. Because the actual ratio recommended by AISC Design Manual is tp/db + 1.6 (mm) for connections with a number of bolts less than six and plate yield strength in construction is normally higher than the nominal value used in design, it is proposed that shear strength of a bolt group in single plate connections with a number of bolts equal or greater than seven be reduced by 15 percent and the tp/db ratio be limited to 0.500.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.6.611
|
kci_detailed_000101.xml
|
||
ART001887595
|
oai_dc
|
A study on bending strength of reinforced concrete filled steel tubular beam
|
A study on bending strength of reinforced concrete filled steel tubular beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Alifujiang Xiamuxi(Xinjiang University); Akira Hasegawa(Hachinohe Institute of Technology); Akenjiang Tuohuti(Xinjiang University)"
] |
The mechanical characteristic of reinforced concrete filled steel tubular (RCFT) structures are differed from that of concrete filled tubular steel (CFT) structures because the reinforcement in RCFT largely affects the performance of core concrete such as ductility, strength and toughness, and hence the performance of RCFT should be evaluated differently from CFT. To examine the effect axial reinforcement on bending performance, an investigation on RCFT beams with varying levels of axial reinforcement is performed by the means of numerical parametric study. According to the numerical simulation results with 13 different ratios of axial reinforcement, it is concluded that the reinforcement has obvious effect on bending capacity, and the neutral axis of RCFT is different from CFT, and an evaluation equation in which the effect of axial reinforcement is considered for ultimate bending strength of RCFT is proposed.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.6.639
|
kci_detailed_000101.xml
|
||
ART001887608
|
oai_dc
|
Topology optimization of nonlinear single layer domes by a new metaheuristic
|
Topology optimization of nonlinear single layer domes by a new metaheuristic
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Saeed Gholizadeh(Urmia University); Hamed Barati(Urmia University)"
] |
The main aim of this study is to propose an efficient meta-heuristic algorithm for topology optimization of geometrically nonlinear single layer domes by serially integration of computational advantages of firefly algorithm (FA) and particle swarm optimization (PSO). During the optimization process, the optimum number of rings, the optimum height of crown and tubular section of the member groups are determined considering geometric nonlinear behaviour of the domes. In the proposed algorithm, termed as FA-PSO, in the first stage an optimization process is accomplished using FA to explore the design space then, in the second stage, a local search is performed using PSO around the best solution found by FA. The optimum designs obtained by the proposed algorithm are compared with those reported in the literature and it is demonstrated that the FA-PSO converges to better solutions spending less computational cost emphasizing on the efficiency of the proposed algorithm.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.6.681
|
kci_detailed_000101.xml
|
||
ART001887616
|
oai_dc
|
Evaluating long-term relaxation of high strength bolts considering coating on slip faying surface
|
Evaluating long-term relaxation of high strength bolts considering coating on slip faying surface
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"나환선(한국전력공사 전력연구원); 이현주(한국전력공사 전력연구원); 최성모(서울시립대학교)"
] |
The initial clamping forces of high strength bolts subjected to different faying surface conditions drop within 500 hours regardless of loading, any other external force or loosening of the nut. This study develops a mathematical model for relaxation confined to creep on a coated faying surface after initial clamping. The quantitative model for estimating relaxation was derived from a regression analysis for the relation between the creep strain of the coated surface and the elapsed time for 744 hours. This study establishes an expected model for estimating the relaxation of bolted joints with diverse coated surfaces. The candidate bolts are dacro-coated tension control bolts, ASTM A490 bolt, and plain tension control bolts. The test parameters were coating thickness, species of coating. As for 96, 128, 168, and 226 μm thick inorganic zinc, when the coating thickness was increased, relaxation after the initial clamping rose to a much higher range from 10% to 18% due to creep of the coating. The amount of relaxation up to 7 days exceeded 85% of the entire relaxation. From this result, the equation for creep strain can be derived from a statistical regression analysis. Based on the acquired creep behavior, it is expected that the clamping force reflecting relaxation after the elapse of constant time can be calculated from the initial clamping force. The manufacturer’s recommendation of inorganic zinc on faying surface as 75 μm, appears to be reasonable.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.6.703
|
kci_detailed_000101.xml
|
||
ART001887601
|
oai_dc
|
Compression tests of cold-formed channel sections with perforations in the web
|
Compression tests of cold-formed channel sections with perforations in the web
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"권영봉(영남대학교); 김갑득(RIST강구조연구소); 권인규(강원대학교)"
] |
This paper describes a series of compression tests performed on cold-formed steel channel sections with perforations in the web (thermal studs) fabricated from a galvanized steel plate whose thickness ranged from 1.0 mm to 1.6 mm and nominal yield stress was 295 MPa. The structural behavior and performance of thermal studs undergoing local, distortional, or flexural-torsional buckling were investigated experimentally and analytically. The compression tests indicate that the slits in the web had significant negative effects on the buckling and ultimate strength of thin-walled channel section columns. The compressive strength of perforated thermal studs was estimated using equivalent solid channel sections of reduced thickness instead of the studs. The direct strength method, a newly developed and adopted alternative to the effective width method for designing cold-formed steel sections in the AISI Standard S100 (2004) and AS/NZS 4600 (Standard Australia 2005), was calibrated to the test results for its application to cold-formed channel sections with slits in the web. The results verify that the DSM can predict the ultimate strength of channel section columns with slits in the web by substituting equivalent solid sections of reduced thickness for them.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.6.65
|
kci_detailed_000101.xml
|
||
ART001887541
|
oai_dc
|
Non-linear analysis of side-plated RC beams considering longitudinal and transversal interlayer slips
|
Non-linear analysis of side-plated RC beams considering longitudinal and transversal interlayer slips
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jerneja Kolšek(ZAG - Slovenian National Building and Civil Engineering Institute); Tomaž Hozjan(University of Ljubljana); Aleš Kroflič(University of Ljubljana); Igor Planinc(University of Ljubljana); Miran Saje(University of Ljubljana)"
] |
A new mathematical model and its finite element formulation for the non-linear stress-strain analysis of a planar beam strengthened with plates bolted or adhesively bonded to its lateral sides is presented. The connection between the layers is considered to be flexible in both the longitudinal and the transversal direction. The following assumptions are also adopted in the model: for each layer (i.e., the beam and the side plates) the geometrically linear and materially non-linear Bernoulli's beam theory is assumed, all of the layers are made of different homogeneous non-linear materials, the debonding of the beam from the side-plates due to, for example, a local buckling of the side plate, is prevented. The suitability of the theory is verified by the comparison of the present numerical results with experimental and numerical results from literature. The mechanical response arising from the theoretical model and its numerical formulation has been found realistic and the numerical model has been proven to be reliable and computationally effective. Finally, the present formulation is employed in the analysis of the effects of two different realizations of strengthening of a characteristic simply supported flexural beam (plates on the sides of the beam versus the tension-face plates). The analysis reveals that side plates efficiently enhance the bearing capacity of the flexural beam and can, in some cases, outperform the tensile-face plates in a lower loss of ductility, especially, if the connection between the beam and the side plates is sufficiently stiff.
|
토목공학
| null |
kci_detailed_000101.xml
|
|||
ART001887555
|
oai_dc
|
Dynamic stiffness analysis of steel-concrete composite beams
|
Dynamic stiffness analysis of steel-concrete composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jun Li(Wuhan University of Technology); Qiji Huo(Wuhan University of Technology); Xiaobin Li(Wuhan University of Technology); Xiangshao Kong(Wuhan University of Technology); Weiguo Wu(Wuhan University of Technology)"
] |
An exact dynamic stiffness method is introduced for investigating the free vibration characteristics of the steel-concrete composite beams consisting of a reinforced concrete slab and a steel beam which are connected by using the stud connectors. The elementary beam theory is used to define the dynamic behaviors of the two beams and the relative transverse deformation of the connectors is included in the formulation. The dynamic stiffness matrix is formulated from the exact analytical solutions of the governing differential equations of the composite beams in undamped free vibration. The application of the derived dynamic stiffness matrix is illustrated to predict the natural frequencies and mode shapes of the steel-concrete composite beams with seven boundary conditions. The present results are compared to the available solutions in the literature whenever possible.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.6.577
|
kci_detailed_000101.xml
|
||
ART001887565
|
oai_dc
|
Ballistic behavior of steel sheet subjected to impact and perforation
|
Ballistic behavior of steel sheet subjected to impact and perforation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tomasz Jankowiak(Institute of Structural Engineering); Alexis Rusinek(National Engineering School of Metz); K.M. Kpenyigba(National Engineering School of Metz); Raphaël Pesci(ENSAM-Arts et Métiers ParisTech CER of Metz)"
] |
The paper is reporting some comparisons between experimental and numerical results in terms of failure mode, failure time and ballistic properties of mild steel sheet. Several projectile shapes have been considered to take into account the stress triaxiality effect on the failure mode during impact, penetration and perforation. The initial and residual velocities as well as the failure time have been measured during the tests to estimate more physical quantities. It has to be noticed that the failure time was defined using a High Speed Camera (HSC). Thanks to it, the impact forces (average and maximum level), were analyzed using numerical simulations together with an analytical description coupled to experimental observations. The key point of the model is the consideration of a shape function to define the pulse loading during perforation.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.6.595
|
kci_detailed_000101.xml
|
||
ART001875836
|
oai_dc
|
Seismic behavior of special moment-resisting frames with energy dissipating devices under near source ground motions
|
Seismic behavior of special moment-resisting frames with energy dissipating devices under near source ground motions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mahmoud Bayat(Islamic Azad University); Mahdi Bayat(Islamic Azad University)"
] |
In this study, the performances of the SMRF building equipped with energy dissipating devices are studied. Three types of these structures with different heights are considered. The Added Damping and Stiffness (ADAS) devices are used as energy dissipating devices in these structures. The behavior of these structures with ADAS devices subjected to near source ground motions are investigated. Three SMRF buildings with five, ten and fifteen-story, with ADAS devices were chosen. The nonlinear time history analysis was used by applying the near source ground motions with PERFORM 3D.V4 and conclusions are drawn upon an energy criterion. The effect of PGA variation and height of the frames are also considered based on the energy criterion.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.5.533
|
kci_detailed_000101.xml
|
||
ART001875831
|
oai_dc
|
Compressive performances of concrete filled Square CFRP-Steel Tubes (S-CFRP-CFST)
|
Compressive performances of concrete filled Square CFRP-Steel Tubes (S-CFRP-CFST)
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Qingli Wang(Shenyang Jianzhu University); Yong-Bo Shao(Yantai Univ.)"
] |
Sixteen concrete filled square CFRP-steel tubular (S-CFRP-CFST) stub columns under axial compression were experimentally investigated. The experimental results showed that the failure mode of the specimens is strength loss of the materials, and the confined concrete has good plasticity due to confinement of the CFRP-steel composite tube. The steel tube and CFRP can work concurrently. The load versus longitudinal strain curves of the specimens can be divided into 3 stages, i.e., elastic stage, elasto-plastic stage and softening stage. Analysis based on finite element method showed that the longitudinal stress of the steel tube keeps almost constant along axial direction, and the transverse stress at the corner of the concrete is the maximum. The confinement effect of the outer tube to the concrete is mainly focused on the corner. The confinements along the side of the cross-section and the height of the specimen are both non-uniform. The adhesive strength has little effect both on the load versus longitudinal strain curves and on the confinement force versus longitudinal strain curves. With the increasing of the initial stress in the steel tube, the load carrying capacity, the stiffness and the peak value of the average confinement force are all reduced. Equation for calculating the load carrying capacity of the composite stub columns is presented, and the estimated results agree well with the experimental results.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.5.455
|
kci_detailed_000101.xml
|
||
ART001875833
|
oai_dc
|
Development of a novel self-centering buckling-restrained brace with BFRP composite tendons
|
Development of a novel self-centering buckling-restrained brace with BFRP composite tendons
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Z. Zhou(Southeast University); X.T. He(Southeast University); J. Wu(Southeast University); C.L. Wang(Southeast University); S.P. Meng(Southeast University)"
] |
Buckling-restrained braces (BRBs) have excellent hysteretic behavior while buckling-restrained braced frames (BRBFs) are susceptible to residual lateral deformations. To address this drawback, a novel self-centering (SC) BRB with Basalt fiber reinforced polymer (BFRP) composite tendons is presented in this work. The configuration and mechanics of proposed BFRP-SC-BRBs are first discussed. Then an 1840-mm-long BFRP-SC-BRB specimen is fabricated and tested to verify its hysteric and self-centering performance. The tested specimen has an expected flag-shaped hysteresis character, showing a distinct self-centering tendency. During the test, the residual deformation of the specimen is only about 0.6 mm. The gap between anchorage plates and welding ends of bracing tubes performs as expected with the maximum opening value 6 mm when brace is in compression. The OpenSEES software is employed to conduct numerical analysis. Experiment results are used to validate the modeling methodology. Then the proposed numerical model is used to evaluate the influence of initial prestress, tendon diameter and core plate thickness on the performance of BFRP-SC-BRBs. Results show that both the increase of initial prestress and tendon diameters can obviously improve the self-centering effect of BFRP-SC-BRBs. With the increase of core plate thickness, the energy dissipation is improved while the residual deformation is generated when the core plate strength exceeds initial prestress force.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.5.491
|
kci_detailed_000101.xml
|
||
ART001875834
|
oai_dc
|
A higher order shear deformation theory for static and free vibration of FGM beam
|
A higher order shear deformation theory for static and free vibration of FGM beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"L. Hadji(Université Ibn Khaldoun); T.H. Daouadji(Université Ibn Khaldoun); A. Tounsi(Universitade Sidi Bel Abbes); E.A. Bedia(Université de Sidi Bel Abbes)"
] |
In this paper, a higher order shear deformation beam theory is developed for static and free vibration analysis of functionally graded beams. The theory account for higher-order variation of transverse shear strain through the depth of the beam and satisfies the zero traction boundary conditions on the surfaces of the beam without using shear correction factors. The material properties of the functionally graded beam are assumed to vary according to power law distribution of the volume fraction of the constituents. Based on the present higher-order shear deformation beam theory, the equations of motion are derived from Hamilton's principle. Navier type solution method was used to obtain frequencies. Different higher order shear deformation theories and classical beam theories were used in the analysis. A static and free vibration frequency is given for different material properties. The accuracy of the present solutions is verified by comparing the obtained results with the existing solutions.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.5.507
|
kci_detailed_000101.xml
|
||
ART001875835
|
oai_dc
|
Accurate periodic solution for nonlinear vibration of thick circular sector slab
|
Accurate periodic solution for nonlinear vibration of thick circular sector slab
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Iman Pakar(Islamic Azad University); Mahmoud Bayat(Islamic Azad University); Mahdi Bayat(Islamic Azad University)"
] |
In this paper we consider a periodic solution for nonlinear free vibration of conservative systems for thick circular sector slabs. In Energy Balance Method (EBM) contrary to the conventional methods, only one iteration leads to high accuracy of the solutions. The excellent agreement of the approximate frequencies and periodic solutions with the exact ones could be established. Some patterns are given to illustrate the effectiveness and convenience of the methodology. Comparing with numerical solutions shows that the energy balance method can converge to the numerical solutions very rapidly which are valid for a wide range of vibration amplitudes as indicated in this paper.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.5.521
|
kci_detailed_000101.xml
|
||
ART001875832
|
oai_dc
|
Energy absorption of reinforced concrete deep beams strengthened with CFRP sheet
|
Energy absorption of reinforced concrete deep beams strengthened with CFRP sheet
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Panjehpour(Universiti Putra Malaysia); Abang Abdullah Abang Ali(Universiti Putra Malaysia); Farah Nora Aznieta(Universiti Putra Malaysia)"
] |
The function of carbon fibre reinforced polymer (CFRP) reinforcement in increasing the ductility of reinforced concrete (RC) deep beam is important in such shear-sensitive RC member. This paper aims to investigate the effect of CFRP-strengthening on the energy absorption of RC deep beams. Six ordinary RC deep beams and six CFRP-strengthened RC deep beams with shear span to the effective depth ratio of 0.75, 1.00, 1.25, 1.50, 1.75, and 2.00 were tested till failure in this research. An empirical relationship was established to obtain the energy absorption of CFRP-strengthened RC deep beams. The shear span to the effective depth ratio and growth of energy absorption of CFRP-strengthened deep beam were the significant factors to establish this relationship.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.16.5.481
|
kci_detailed_000101.xml
|
||
ART001910880
|
oai_dc
|
Mechanical behavior of steel-concrete composite decks with perfobond shear connectors
|
Mechanical behavior of steel-concrete composite decks with perfobond shear connectors
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hamed Allahyari(Babol Noshirvani University of Technology); Mehdi Dehestani(Babol Noshirvani University of Technology); Morteza H.A. Beygi(Babol Noshirvani University of Technology); Bahram Navayi Neya(Babol Noshirvani University of Technology)"
] |
Exodermic deck systems are new composite steel grid deck systems which have been used in various projects during the past decade. One of the eminent features of this system is considerable reduction in the structure weight compared to the ordinary reinforced concrete decks and also reduction in construction time by using precast Exodermic decks. In this study, dynamic properties of the Exodermic deck bridges with alternative perfobond shear connectors are investigated experimentally. In order to evaluate the dynamic properties of the decks, peak picking and Nyquist circle fit methods are employed. Frequencies obtained experimentally are in good agreement with the results of the finite-element solution, and the experimental results show that the first mode is the most effective mode among the obtained modes. The first four modes are the rigid translational motion modes, and the next two modes seem to be rigid rotational motion modes around a horizontal axis. From the 7th mode onwards, modes are flexible. The range of damping ratios is about 0.5%. Furthermore, the static behavior of the Exodermic decks under a static load applied at the center of the decks was investigated. Failure of the decks under positive bending was punching-shear. The bending strength of the decks under negative bending was about 50 percent of their strength under positive bending. In addition, the weight of an Exodermic deck is about 40% of that of an equivalent reinforced concrete slab.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.3.339
|
kci_detailed_000101.xml
|
||
ART001910869
|
oai_dc
|
3D FE modeling considering shear connectors representation and number in CBGB
|
3D FE modeling considering shear connectors representation and number in CBGB
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Muthanna A. Abbu(University of Gaziantep); Talha A. Ekmekyapar(University of Gaziantep); Mustafa A. Özakça(University of Gaziantep)"
] |
The use of composite structures is increasingly present in civil building works. Composite Box Girder Bridges (CBGB), particularly, are study of effect of shear connector's numbers and distribution on the behavior of CBGBs is submitted. A Predicti structures consisting of two materials, both connected by metal devices known as shear connectors. The main functions of these connectors are to allow for the joint behavior of the girder-deck, to restrict longitudinal slipping and uplifting at the element's interface and to take shear forces. This paper presents 3D numerical models of CBGBs to simulate their actual structural behavior, with emphasis on the girder-deck interface. Additionally, a Prediction of several FE models is assessed against the results acquired from a field test. A number of factors are considered, and confirmed through experiments, especially full shear connections, which are obviously essential in composite box girder. A good representation for shear connectors by suitable element type is considered. Numerical predictions of vertical displacements at critical sections fit fairly well with those evaluated experimentally. The agreement between the FE models and the experimental models show that the FE model can aid engineers in design practices of box girder bridges. Preliminary results indicate that number of shear studs can be significantly reduced to facilitate adoption of a new arrangement in modeling CBGBs with full composition. However, a further feasibility study to investigate the practical and economic aspects of such a remedy is recommended, and it may represent partial composition in such modeling.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.3.237
|
kci_detailed_000101.xml
|
||
ART001910871
|
oai_dc
|
Behavior and design of stainless steel tubular member welded end connections
|
Behavior and design of stainless steel tubular member welded end connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guven Kiymaz(Fatih University); Edip Seckin(Istanbul Kultur University)"
] |
Among the various alternatives to make a steel tubular member connection, making a slotted and gusset plate welded connection is one of the most frequently preferred alternatives. This type of connection is essentially an end connection that is made by slotting the tube longitudinally, inserting the gusset plate and then placing longitudinal fillet welds at the tube-to-plate interface. In this paper an experimental study on the behaviour of such connections in stainless steel is presented. 24 specimens were tested under concentrically applied axial tensile forces for varying tube-to-gusset plate weld lengths. Both circular and box section members were considered in the test program. Load-deformation curves were obtained and comparisons were made in terms of strength and ductility. The results obtained from the study were then critically examined and compared with currently available design guidance for slotted gusset plate welded tubular end connections. It is noted that no specific rules exist in international specifications on structural stainless steel which cover the design of such connections. Therefore, the results of this study are compared with the existing design rules for carbon steel.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.3.253
|
kci_detailed_000101.xml
|
||
ART001910867
|
oai_dc
|
Prediction of the flexural overstrength factor for steel beams using artificial neural network
|
Prediction of the flexural overstrength factor for steel beams using artificial neural network
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Esra Mete Güneyisi(Gaziantep University); Mario D’Aniello(University of Naples “Federico II”); Raffaele Landolfo(University of Naples “Federico II”); Kasım Mermerdaş(Hasan Kalyoncu University)"
] |
The flexural behaviour of steel beams significantly affects the structural performance of the steel frame structures. In particular, the flexural overstrength (namely the ratio between the maximum bending moment and the plastic bending strength) that steel beams may experience is the key parameter affecting the seismic design of non-dissipative members in moment resisting frames. The aim of this study is to present a new formulation of flexural overstrength factor for steel beams by means of artificial neural network (NN). To achieve this purpose, a total of 141 experimental data samples from available literature have been collected in order to cover different cross-sectional typologies, namely I-H sections, rectangular and square hollow sections (RHS-SHS). Thus, two different data sets for I-H and RHS-SHS steel beams were formed. Nine critical prediction parameters were selected for the former while eight parameters were considered for the latter. These input variables used for the development of the prediction models are representative of the geometric properties of the sections, the mechanical properties of the material and the shear length of the steel beams. The prediction performance of the proposed NN model was also compared with the results obtained using an existing formulation derived from the gene expression modeling. The analysis of the results indicated that the proposed formulation provided a more reliable and accurate prediction capability of beam overstrength.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.3.215
|
kci_detailed_000101.xml
|
||
ART001910876
|
oai_dc
|
Buckling of symmetrically laminated quasi-isotropic thin rectangular plates
|
Buckling of symmetrically laminated quasi-isotropic thin rectangular plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Erkin Altunsaray(Dokuz Eylul University); İsmail Bayer(Yildiz Technical University)"
] |
The lowest critical value of the compressive force acting in the plane of symmetrically laminated quasi-isotropic thin rectangular plates is investigated. The critical buckling loads of plates with different types of lamination and aspect ratios are parametrically calculated. Finite Differences Method (FDM) and Galerkin Method are used to solve the governing differential equation for Classical Laminated Plate Theory (CLPT). The results calculated are compared with those obtained by the software ANSYS employing Finite Elements Method (FEM). The results of Galerkin Method (GM) are closer to FEM results than those of FDM. In this study, the primary aim is to conduct a parametrical performance analysis of proper plates that is typically conducted at preliminary structural design stage of composite vessels. Non-dimensional values of critical buckling loads are also provided for practical use for designers.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.3.305
|
kci_detailed_000101.xml
|
||
ART001910878
|
oai_dc
|
A novel first-order shear deformation theory for laminated composite plates
|
A novel first-order shear deformation theory for laminated composite plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohamed Sadoune(University of Sidi Bel Abbes); Abdelouahed Tounsi(University of Sidi Bel Abbes); Mohammed Sid Ahmed Houari(Université de Sidi Bel Abbes); El Abbes Adda Bedia(Université de Sidi Bel Abbes)"
] |
In the present study, a new simple first-order shear deformation theory is presented for laminated composite plates. Moreover, the number of unknowns of this theory is the least one comparing with the traditional first-order and the other higher-order shear deformation theories. Equations of motion and boundary conditions are derived from Hamilton's principle. Analytical solutions of simply supported antisymmetric cross-ply and angle-ply laminates are obtained and the results are compared with the exact three-dimensional (3D) solutions and those predicted by existing theories. It can be concluded that the proposed theory is accurate and simple in solving the static bending and free vibration behaviors of laminated composite plates.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.3.321
|
kci_detailed_000101.xml
|
||
ART001910873
|
oai_dc
|
Experimental behavior of eccentrically loaded RC slender columns strengthened using GFRP wrapping
|
Experimental behavior of eccentrically loaded RC slender columns strengthened using GFRP wrapping
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.K. Elwan(The Higher Institute of Engineering); M.A. Omar(The Higher Institute of Engineering)"
] |
This paper aims to examine the behavior of slender reinforced concrete columns confined with external glass fiber reinforced polymers (GFRP) sheets under eccentric loads. The experimental work conducted in this paper is an extension to previous work by the author concerning the behavior of eccentrically loaded short columns strengthened with GFRP wrapping. In this study, nine reinforced concrete columns divided into three groups were casted and tested. Three eccentricity ratios corresponding to e/t = 0, 0.10, and 0.50 in one direction of the column were tested in each group. The first group was the control one without confinement with slenderness ratio equal 20. The second group was the same as the first group but fully wrapped with one layer of GFRP laminates. The third group was also fully wrapped with one layer of GFRP laminates but having slenderness ratio equal 15. The experimental results of another two groups from the previous work were used in this study to investigate the difference between short and slender columns. The first was control one with slenderness ratio equal 10 and the second was fully wrapped and having the same slenderness ratio. All specimens were loaded until failure. The ultimate load, axial deformation, strain in steel bars, and failure mechanisms of each specimen were generated and analyzed. The results show that GFRP laminates confining system is less effective with slender columns compared with short one, but this solution is still applied and it can be efficiently utilized especially for slender columns with low eccentric ratio.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.3.271
|
kci_detailed_000101.xml
|
||
ART001910874
|
oai_dc
|
Experimental study on hysteretic properties of SRC columns with high steel ratio
|
Experimental study on hysteretic properties of SRC columns with high steel ratio
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xilin Lu(Tongji University); Xiaowei Yin(China Academy of Building Research); Huanjun Jiang(Tongji University)"
] |
8 steel reinforced concrete (SRC) columns with the encased steel ratio of 13.12% and 15.04% respectively were tested under the test axial load ratio of 0.33-0.80 and the low-frequency cyclic lateral loading. The cross sectional area of composite columns was 500 mm × 500 mm. The mechanical properties, failure modes and deformabilities were studied. All the specimens produced flexure failure subject to combined axial force, bending moment and shear. Force-displacement hysteretic curves, strain curves of encased steels and rebars were obtained. The interaction behavior of encased steel and concrete were verified. The hysteretic curves of columns were plump in shapes. Hysteresis loops were almost coincident under the same levels of lateral loading, and bearing capacities did not change much, which indicated that the columns had good energy-dissipation performance and seismic capacity. Based on the equilibrium equation, the suggested practical calculation method could accurately predict the flexural strength of SRC columns with cross-shaped section encased steel. The obtained M-N curves of SRC columns can be used as references for further studies.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.3.287
|
kci_detailed_000101.xml
|
||
ART001902975
|
oai_dc
|
Damage of scarf-repaired composite laminates subjected to low-velocity impacts
|
Damage of scarf-repaired composite laminates subjected to low-velocity impacts
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiaoquan Cheng(Beihang University); Wenyi Zhao(Beihang University); Shufeng Liu(Beihang University); Yunyan Xu(Beihang University); Jianwen Bao(Beijing Institute of Aeronautical Materials)"
] |
The damage characters of scarf repaired composite laminates subjected to low-velocity impact with various energy levels at different locations are studied experimentally. The results are compared with those of the original laminates which have no initial damage and don’t need repair. The impact load-time history of the specimens, the velocity-time curves of the impactor, the post impact compressive strength of the specimens and the C-scan photographs of the damaged regions are obtained. The delamination threshold load and damage character of the specimen section at impact point are also studied. The results have shown that the impact response of a repaired composite laminate is sensitive to the location of the impact. The impact load and the delamination threshold load have shown different characters for specimens with different impact locations. The debonding characters of the adhesive and compressive strength after impact of the specimens are also influenced by impact locations.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.2.199
|
kci_detailed_000101.xml
|
||
ART001902968
|
oai_dc
|
Investigation on low velocity impact on a foam core composite sandwich panel
|
Investigation on low velocity impact on a foam core composite sandwich panel
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zonghong Xie(Northwestern Polytechnical University); Qun Yan(Northwestern Polytechnical University); Xiang Li(Northwestern Polytechnical University)"
] |
A finite element model with the consideration of damage initiation and evolution has been developed for the analysis of the dynamic response of a composite sandwich panel subject to low velocity impact. Typical damage modes including fiber breakage, matrix crushing and cracking, delamination and core crushing are considered in this model. Strain-based Hashin failure criteria with stiffness degradation mechanism are used in predicting the initiation and evolution of intra-laminar damage modes by self-developed VUMAT subroutine. Zero-thickness cohesive elements are adopted along the interface regions between the facesheets and the foam core to simulate the initiation and propagation of delamination. A crushable foam core model with volumetric hardening rule is used to simulate the mechanical behavior of foam core material at the plastic state. The time history curves of contact force and the core collapse area are obtained. They all show a good correlation with the experimental data.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.2.159
|
kci_detailed_000101.xml
|
||
ART001902970
|
oai_dc
|
Research on residual stress in SiCf reinforced titanium matrix composites
|
Research on residual stress in SiCf reinforced titanium matrix composites
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Haitao Qu(Beijing Aeronautical Manufacturing Technology Rese); Hongliang Hou(Beijing Aeronautical Manufacturing Technology Rese); Bing Zhao(Beijing Aeronautical Manufacturing Technology Rese); Song Lin(Shijiazhuang Tiedao University)"
] |
This study aimed to theoretical calculate the thermal residual stress in continuous SiC fiber reinforced titanium matrix composites. The analytical solution of residual stress field distribution was obtained by using coaxial cylinder model, and the numerical solution was obtained by using finite element model (FEM). Both of the above models were compared and the thermal residual stress was analyzed in the axial, hoop, radial direction. The results indicated that both the two models were feasible to theoretical calculate the thermal residual stress in continuous SiC fiber reinforced titanium matrix composites, because the deviations between the theoretical calculation results and the test results were less than 8%. In the titanium matrix composites, along with the increment of the SiC fiber volume fraction, the longitudinal property was improved, while the equivalent residual stress was not significantly changed, keeping the intensity around 600 MPa. There was a pronounced reduction of the radial residual stress in the titanium matrix composites when there was carbon coating on the surface of the SiC fiber, because carbon coating could effectively reduce the coefficient of thermal expansion mismatch between the fiber and the titanium matrix, meanwhile, the consumption of carbon coating could protect SiC fibers effectively, so as to ensure the high-performance of the composites. The support of design and optimization of composites was provided though theoretical calculation and analysis of residual stress.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.2.173
|
kci_detailed_000101.xml
|
||
ART001902972
|
oai_dc
|
Constitutive model coupled with damage for carbon manganese steel in low cycle fatigue
|
Constitutive model coupled with damage for carbon manganese steel in low cycle fatigue
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhiyong Huang(Sichuan University); Qingyuan Wang(Sichuan University); Danièle Wagner(Université ParisOuest Nanterre La Défense); Claude Bathias(Université ParisOuest Nanterre La Défense)"
] |
Carbon-manganese steel A42 (French standards) is used in steam generator pipes of nuclear center and subject to low cycle fatigue (LCF) loads. In order to obtain the material LCF behavior, the tests are implemented in a hydraulic fatigue machine. The LCF plastic deformation and cyclic stress in macroscope have been influenced by the accumulated low cycle fatigue damage. The constitutive kinematic and isotropic hardening modeling is modified with coupling fatigue damage to describe the fatigue behavior. The improved model seems to be good agreement with the test results.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.2.185
|
kci_detailed_000101.xml
|
||
ART001902964
|
oai_dc
|
Experimental study on fatigue crack propagation of fiber metal laminates
|
Experimental study on fatigue crack propagation of fiber metal laminates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zonghong Xie(Northwestern Polytechnical University); Fei Peng(Northwestern Polytechnical University); Tianjiao Zhao(Northwestern Polytechnical University)"
] |
This study aimed to investigate the fatigue crack growth behavior of a kind of fiber metal laminates (FML) under four different stress levels. The FML specimen consists of three 2024-T3 aluminum alloy sheets and two layers of glass/epoxy composite lamina. Tensile-tensile cyclic fatigue tests were conducted on centrally notched specimen at four stress levels with various maximum values. A digital camera system was used to take photos of the propagating cracks on both sides of the specimens. Image processing software was adopted to accurately measure the length of the cracks on each photo. The test results show that: (1) a-N and da/dN-a curves of FML specimens can be divided into transient crack growth segment, steady state crack growth segment and accelerated crack growth segment; (2) compared to 2024-T3 aluminum alloy, the fatigue properties of FML are much better; (3) da/dN-ΔK curves of FML specimens can be divided into fatigue crack growth rate decrease segment and fatigue crack growth rate increase segment; (3) the maximum stress level has a large influence on a-N, da/dN-a and da/dN-ΔK curves of FML specimens; (4) the fatigue crack growth rate da/dN presents a nonlinear accelerated increasing trend to the maximum stress level; (5) the maximum stress level has an almost linear relationship with the stress intensity factor ΔK.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.2.157
|
kci_detailed_000101.xml
|
||
ART001936856
|
oai_dc
|
Study on anchorage effect on fractured rock
|
Study on anchorage effect on fractured rock
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jing Wang(Shandong University); Shucai Li(Shandong University); Li-Ping Li(Shandong University); Weishen Zhu(Shandong University); Qian-qing Zhang(Shandong University); Shu-Guang Song(Shandong University)"
] |
The effects of anchor on fractured specimens in splitting test are simulated by DDARF method, the results of which are compared with laboratory test results. They agree well with each other. The paper contents also use the laboratory model test. The main research objects are three kinds of specimens, namely intact specimens, jointed specimens and anchored-jointed specimens. The results showed that with the joint angle increased, the weakening effects of jointed rock mass are more obvious. At these points, the rock bolts' strengthening effects on the specimens have become more significant. There is a significant impact on the failure modes of rock mass by the joint and the anchorage.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.6.791
|
kci_detailed_000101.xml
|
||
ART001936855
|
oai_dc
|
Experimental study on infilled frames strengthened by profiled steel sheet bracing
|
Experimental study on infilled frames strengthened by profiled steel sheet bracing
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Pingzhou Cao(Hohai University); Ningning Feng(Hohai University); Kai Wu(Hohai University)"
] |
The purpose of this study is to investigate the seismic performance of reinforced concrete (RC) frames strengthened by profiled steel sheet bracing which takes the influence of infill walls into consideration. One-bay, two-story, 1/3 scale two specimens shared same feature of dimensions, one specimen consists only beams and columns; the other one is reinforced by profiled steel sheet bracing with infill walls. Hysteretic curves, envelope curves, stiffness degradation curves and energy dissipation capacities are presented based on test data. Test results indicate that the ultimate load of strengthened specimen has been improved by 225%. The stiffness of reinforced by profiled steel sheet bracing has been increased by 108%. This demonstrates that infill walls and profiled steel sheet bracing enhanced the strength and stiffness distinctly. Energy dissipation has an obvious increase after 12 cycles. This shows that the reinforced specimen is able to bear the lateral load effectively and absorb lots of seismic energy.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.6.777
|
kci_detailed_000101.xml
|
||
ART001936862
|
oai_dc
|
Wave propagation in a concrete filled steel tubular column due to transient impact load
|
Wave propagation in a concrete filled steel tubular column due to transient impact load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xuanming Ding(Chongqing University); Yuming Fan(Hohai University); Gangqiang Kong(Hohai University); Changjie Zheng(Hohai University)"
] |
This study aims to present a three dimensional finite element model to investigate the wave propagation in a concrete filled steel tubular column (CFSC) due to transient impact load. Both the concrete and steel are regarded as linear elastic material. The impact load is simulated by a semi sinusoidal impulse.
Besides the CFSC models, a concrete column (CC) model is established for comparing under the same loading condition. The propagation characteristics of the transient waves in CFSC are analyzed in detail. The results show that at the intial stage of the wave propagation, the velocity waves in CFSC are almost the same as those in CC before they arrive at the steel tube. When the waves reach the column side, the velocity responses of CFSC are different from those of CC and the difference is more and more obvious as the waves travel down along the column shaft. The travel distance of the wave front in CFSC is farther than that in CC at the same time. For different wave speeds in steel and concrete material, the wave front in CFSC presents an arch shape, the apex of which locates at the center of the column. Differently, the wave front in CC presents a plane surface. Three dimensional effects on top of CFSC are obvious, therefore, the peak value and arrival time of incident wave crests have great difference at different locations in the radial direction.
High-frequency waves on the waveforms are observed. The time difference between incident and reflected wave peaks decreases significantly with r/R when r/R < 0.6, however, it almost keeps constant when r/R ≥ 0.6. The time duration between incident and reflected waves calculated by 3D FEM is approximately equal to that calculated by 1D wave theory when r/R is about 2/3.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.6.891
|
kci_detailed_000101.xml
|
||
ART001936863
|
oai_dc
|
Ultimate strength behavior of steel-concrete-steel sandwich beams with ultra-lightweight cement composite, Part 1: Experimental and analytical study
|
Ultimate strength behavior of steel-concrete-steel sandwich beams with ultra-lightweight cement composite, Part 1: Experimental and analytical study
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jia-Bao Yan(National University of Singapore); J.Y. Richard Liew(National University of Singapore); Min-Hong Zhang(National University of Singapore); Junyan Wang(National University of Singapore)"
] |
Ultra-lightweight cement composite (ULCC) with a compressive strength of 60 MPa and density of 1450 kg/m³ has been developed and used in the steel-concrete-steel (SCS) sandwich structures.
ULCC was adopted as the core material in the SCS sandwich composite beams to reduce the overall structural weight. Headed shear studs working in pairs with overlapped lengths were used to achieve composite action between the core material and steel face plates. Nine quasi-static tests on this type of SCS sandwich composite beams were carried out to evaluate their ultimate strength performances. Different parameters influencing the ultimate strength of the SCS sandwich composite beams were studied and discussed. Design equations were developed to predict the ultimate resistance of the cross section due to pure bending, pure shear and combined action between shear and moment. Effective stiffness of the sandwich composite beam section is also derived to predict the elastic deflection under service load. Finally, the design equations were validated by the test results.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.6.907
|
kci_detailed_000101.xml
|
||
ART001936864
|
oai_dc
|
Bond behaviors of shape steel embedded in recycled aggregate concrete and recycled aggregate concrete filled in steel tubes
|
Bond behaviors of shape steel embedded in recycled aggregate concrete and recycled aggregate concrete filled in steel tubes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zongping Chen(Guangxi University); Jinjun Xu(Guangxi University); Ying Liang(Guangxi University); Yisheng Su(Guangxi University)"
] |
Thirty one push-out tests were carried out in order to investigate the bond behavior between shape steel, steel tube (named steels) and recycled aggregate concrete (RAC), including 11 steel reinforced recycled aggregate concrete (SRRAC) columns, 10 recycled aggregate concrete-filled circular steel tube (RACFCST) columns and 10 recycled aggregate concrete-filled square steel tube (RACFSST) columns. Eleven recycled coarse aggregate (RCA) replacement ratios (i.e., 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%) were considered for SRRAC specimens, while five RCA replacement ratios (i.e., 0%, 25%, 50%, 75% and 100%), concrete type and length-diameter ratio for recycled aggregate concretefilled steel tube (RACFST) specimens were designed in this paper. Based on the test results, the influences of all variable parameters on the bond strength between steels and RAC were investigated. It was found that the load-slip curves at the loading end appeared the initial slip earlier than the curves at the free end. In addition, eight practical bond strength models were applied to make checking computations for all the specimens. The theoretical analytical model for interfacial bond shear transmission length in each type of steel-RAC composite columns was established through the mechanical derivation, which can be used to design and evaluate the performance of anchorage zones in steel-RAC composite structures.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.6.929
|
kci_detailed_000101.xml
|
||
ART001936865
|
oai_dc
|
Inelastic response of wide flange steel beams curved by symmetrical weak axis bending using two-point loads
|
Inelastic response of wide flange steel beams curved by symmetrical weak axis bending using two-point loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Antoine N. Gergess(University of Balamand); Rajan Sen(University of South Florida)"
] |
Point bending is commonly used for cambering and curving steel girders to large radii. In this system, a hydraulic ram or press is used to apply concentrated loads at selected points to obtain the required vertical (cambering) or horizontal (curving) curved profile from induced permanent deformations. This paper derives closed form solutions that relate loads to permanent deformations for horizontally curving wide flange steel beams based on their post-yield response. These solutions are presented in a parametric form to identify the relationship between key variables and their impact on the accuracy of the curving operation. It is shown that point bending could yield parabolic curved profiles that are within 1% of a desired circular curve if the span length to radius of curvature ratio (L / R) is less than 1.5 and the point loads are spaced at one third the beam length. Safe limits are then established on loads, strains and curvatures to avoid damaging the steel section. This leads to optimization of the point bending operation for inducing a circular profile in wide flange steel beams of any size.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.6.951
|
kci_detailed_000101.xml
|
||
ART001936866
|
oai_dc
|
Static behaviour of multi-row stud shear connectors in high- strength concrete
|
Static behaviour of multi-row stud shear connectors in high- strength concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Qing-Tian Su(Tongji University); Guotao Yang(The University of New South Wales); Mark A. Bradford(The University of New South Wales)"
] |
In regions of high shear forces in composite bridges, headed stud shear connectors need to be arranged with a small spacing in order to satisfy the design requirement of resisting the high interface shear force present at this location. Despite this, studies related to groups of headed studs are somewhat rare. This paper presents an investigation of the static behaviour of grouped stud shear connectors in high-strength concrete. Descriptions are given of five push-out test specimens with different arrangements of the studs that were fabricated and tested, and the failure modes, load-slip response, ultimate load capacities and related slip values that were obtained are reported. It is found that the load-slip equation given by some researchers based on a single stud shear connector in normal strength concrete do not apply to grouped stud shear connectors in high-strength concrete, and an algebraic load-slip expression is proposed based on the test results. Comparisons between the test results and the formulae provided by some national codes show that the equations for the ultimate capacity provided in these codes are conservative when used for connectors in high-strength concrete. A reduction coefficient is proposed to take into account the effect of the studs being in a group.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.6.967
|
kci_detailed_000101.xml
|
||
ART001936857
|
oai_dc
|
Dynamic characteristics of hybrid tower of cable-stayed bridges
|
Dynamic characteristics of hybrid tower of cable-stayed bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shehata E. Abdel Raheem(Taibah University)"
] |
The dynamic characterization is important in making accurate predictions of the seismic response of the hybrid structures dominated by different damping mechanisms. Different damping characteristics arise from the construction of the tower with different materials: steel for the upper part; reinforced concrete for the lower main part and interaction with supporting soil. The process of modeling damping matrices and experimental verification is challenging because damping cannot be determined via static tests as can mass and stiffness. The assumption of classical damping is not appropriate if the system to be analyzed consists of two or more parts with significantly different levels of damping, such as steel/ concrete mixed structure - supporting soil coupled system. The dynamic response of structures is critically determined by the damping mechanisms, and its value is very important for the design and analysis of vibrating structures. An analytical approach capable of evaluating the equivalent modal damping ratio from structural components is desirable for improving seismic design. Two approaches are considered to define and investigate dynamic characteristics of hybrid tower of cable-stayed bridges: The first approach makes use of a simplified approximation of two lumped masses to investigate the structure irregularity effects including damping of different material, mass ratio, frequency ratio on dynamic characteristics and modal damping; the second approach employs a detailed numerical step-by step integration procedure in which the damping matrices of the upper and the lower substructures are modeled with the Rayleigh damping formulation.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.6.803
|
kci_detailed_000101.xml
|
||
ART001936858
|
oai_dc
|
The effect of MWCNTs on the mechanical properties of woven Kevlar/epoxy composites
|
The effect of MWCNTs on the mechanical properties of woven Kevlar/epoxy composites
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Iman Taraghi(Semnan University); Abdolhossein Fereidoon(Semnan University); Ali Mohyeddin(Islamic Azad University)"
] |
This manuscript presents an experimental investigation on the effect of multi-walled carbon nanotubes (MWCNTs) addition on the tensile, flexural and impact properties of woven Kevlar fabric reinforced epoxy composites. MWCNTs were dispersed in the epoxy resin by sonication technique and the samples were fabricated by hand layup laminating procedure. Scanning electron microscopy (SEM) was used to characterize the microstructure of produced samples. The effects of adding small amounts (≤ 1%) of MWCNT on the tensile, flexural and impact (Izod) behaviors of laminated composites were analyzed. Results revealed that MWCNTs enhanced the Young's modulus up to 20%, bending modulus up to 40%, and impact strength up to 45% in comparison with woven Kevlar fabric/epoxy composites. It was found that the maximum improvements in mechanical properties were happened for 0.5 wt.% MWCNT.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.6.825
|
kci_detailed_000101.xml
|
||
ART001936859
|
oai_dc
|
Fire design of concrete encased columns: Validation of an advanced calculation model
|
Fire design of concrete encased columns: Validation of an advanced calculation model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R. Zaharia(Politehnica University of Timisoara); D. Dubina(The “Politehnica” University of Timisoara)"
] |
The fire resistance of composite steel and concrete structures may be determined by using the simplified methods provided in EN 1994-1-2. For the particular situations not covered by the standard, an advanced calculation model might be applied, using special purpose programs for the analysis of structures in fire. The validation of these programs has always been an important issue for software developers, but also for designers and authorities. Clause 4.4.4 from EN 1994-1-2 refers to the validation of the advanced calculation models and states that these models must be validated through relevant test results. The paper presents the calculation of fire resistance of the composite columns in a high-rise building built in Romania, and focusses on the validation of the calculation model (computer program SAFIR), for this particular case. This validation, asked by the Romanian authorities, considers the available experimental results of a fire test, performed on a similar composite steel-concrete column.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.6.835
|
kci_detailed_000101.xml
|
||
ART001936860
|
oai_dc
|
Experimental study on seismic performance of partial penetration welded steel beam-column connections with different fillet radii
|
Experimental study on seismic performance of partial penetration welded steel beam-column connections with different fillet radii
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hanbin Ge(Meijo University); Liang-Jiu Jia(Meijo University); Lan Kang(South China University of Technology); Toshimitsu Suzuki(Mitubishi Heavy Industries, Ltd.)"
] |
Full penetration welded steel moment-resisting frame (SMRF) structures with welded box sections are widely employed in steel bridges, where a large number of steel bridges have been in operation for over fifty years in Japan. Welding defects such as incomplete penetration at the beam-column connections of these existing SMRF steel bridge piers were observed during inspection. Previous experiments conducted by the authors' team indicate that gusset stiffeners (termed fillets in this study) at the beam-web-to-column-web joint of the beam-column connections may play an important role on the seismic performance of the connections. This paper aims to experimentally study the effect of the fillet radius on seismic performance of the connections with large welding defects. Four specimens with different sizes of fillet radii were loaded under quasi-static incremental cyclic loading, where different load-displacement relations and cracking behaviors were observed. The experimental results show that, as the size of the fillet radius increases, the seismic performance of the connections can be greatly improved.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.6.851
|
kci_detailed_000101.xml
|
||
ART001936861
|
oai_dc
|
Nonlinear bending analysis of laminated composite stiffened plates
|
Nonlinear bending analysis of laminated composite stiffened plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shuvendu N. Patel(BITS Pilani)"
] |
This paper deals with the geometric nonlinear bending analysis of laminated composite stiffened plates subjected to uniform transverse loading. The eight-noded degenerated shell element and three-noded degenerated curved beam element with five degrees of freedom per node are adopted in the present analysis to model the plate and stiffeners respectively. The Green-Lagrange strain displacement relationship is adopted and the total Lagrangian approach is taken in the formulation. The convergence study of the present formulation is carried out first and the results are compared with the results published in the literature. The stiffener element is reformulated taking the torsional rigidity in an efficient manner. The effects of lamination angle, depth of stiffener and number of layers, on the bending response of the composite stiffened plates are considered and the results are discussed.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.6.867
|
kci_detailed_000101.xml
|
||
ART001896393
|
oai_dc
|
A trigonometric four variable plate theory for free vibration of rectangular composite plates with patch mass
|
A trigonometric four variable plate theory for free vibration of rectangular composite plates with patch mass
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kada Draiche(University of Sidi Bel Abbes); Abdelouahed Tounsi(University of Sidi Bel Abbes); Y. Khalfi(University of Sidi Bel Abbes)"
] |
The novelty of this paper is the use of trigonometric four variable plate theory for free vibration analysis of laminated rectangular plate supporting a localized patch mass. By dividing the transverse displacement into bending and shear parts, the number of unknowns and governing equations of the present theory is reduced, and hence, makes it simple to use. The Hamilton's Principle, using trigonometric shear deformation theory, is applied to simply support rectangular plates. Numerical examples are presented to show the effects of geometrical parameters such as aspect ratio of the plate, size and location of the patch mass on natural frequencies of laminated composite plates. It can be concluded that the proposed theory is accurate and simple in solving the free vibration behavior of laminated rectangular plate supporting a localized patch mass.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.1.069
|
kci_detailed_000101.xml
|
||
ART001896395
|
oai_dc
|
Stiffener configurations of beam to concrete-filled tube column connections
|
Stiffener configurations of beam to concrete-filled tube column connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abdelrahim K. Dessouki(Ain Shams University); Ahmed H. Yousef(Ain Shams University); Mona M. Fawzy(Ain Shams University)"
] |
The objective of this research is to study the ultimate moment capacity of the connections between steel I-beams and concrete-filled steel tube columns using different stiffener configurations. The main parameters considered are column cross section shape, square or circular, and filling the column with concrete. This analytical study includes finite element models using ANSYS program taking geometric and material nonlinearities into consideration. These models are verified against the experimental results obtained from previous researches and current design guides. The results show that using proper stiffener configuration affects the stress distribution through the connection and increases the ultimate moment capacity of the connections. Also, circular column is advantageous than the square column for all stiffener configurations and dimensions.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.1.083
|
kci_detailed_000101.xml
|
||
ART001896390
|
oai_dc
|
A n-order four variable refined theory for bending and free vibration of functionally graded plates
|
A n-order four variable refined theory for bending and free vibration of functionally graded plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"I. Klouche Djedid(University of Sidi Bel Abbes); Abdelkader Benachour(University of Sidi Bel Abbes); Mohammed Sid Ahmed Houari(Université de Sidi Bel Abbes); Mohammed Ameur(Universitée de Sidi Bel Abbes); Abdelouahed Tounsi(University of Sidi Bel Abbes)"
] |
This paper presents a simple n-order four variable refined theory for the bending and vibration analyses of functionally graded plates. By dividing the transverse displacement into bending and shear parts, the number of unknowns and governing equations of the present theory is reduced, and hence, makes it simple to use. The present theory is variationally consistent, uses the n-order polynomial term to represent the displacement field, does not require shear correction factor, and gives rise to transverse shear stress variation such that the transverse shear stresses vary parabolically across the thickness satisfying shear stress free surface conditions. The governing equations are derived by employing the Hamilton’s principle and the physical neutral surface concept. The accuracy of the present solutions is verified by comparing the obtained results with available published ones.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.1.021
|
kci_detailed_000101.xml
|
||
ART001896388
|
oai_dc
|
Buckling and vibration of laminated composite circular plate on Winkler-type foundation
|
Buckling and vibration of laminated composite circular plate on Winkler-type foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"B. Afsharmanesh(Iran University of Science and Technology); A. Ghaheri(Iran University of Science and Technology); F. Taheri-Behrooz(Iran University of Science and Technology)"
] |
Buckling and vibration characteristics of circular laminated plates under in-plane edge loads and resting on Winkler-type foundation are solved by the Ritz method. Inclusive numerical data are presented for the first three eigen-frequencies as a function of in-plane load for different classical edge conditions.
Moreover, the effects of fiber orientation on the natural frequencies and critical buckling loads of laminated angle-ply plates with stacking sequence of [(β / –β / β / –β)]s, are studied. Also, selected deformation mode shapes are illustrated. The correctness of results is established using finite element software as well as by comparison with the existing results in the literature.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.1.001
|
kci_detailed_000101.xml
|
||
ART001896396
|
oai_dc
|
Structural stability of fire-resistant steel (FR490) H-section columns at elevated temperatures
|
Structural stability of fire-resistant steel (FR490) H-section columns at elevated temperatures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"권인규(강원대학교); 권영봉(영남대학교)"
] |
A fundamental limitation of steel structures is the decrease in their load-bearing capacity at high temperatures in fire situations such that structural members may require some additional treatment for fire resistance. In this regard, this paper evaluates the structural stability of fire-resistant steel, introduced in the late 1999s, through tensile coupon tests and proposes some experimental equations for the yield stress, the elastic modulus, and specific heat. The surface temperature, deflection, and maximum stress of fire-resistant steel H-section columns were calculated using their own mechanical and thermal properties. According to a comparison of mechanical properties between fire-resistant steel and Eurocode 3, the former outperformed the latter, and based on a comparison of structural performance between fire-resistant steel and ordinary structural steel of equivalent mechanical properties at room temperature, the former had greater structural stability than the latter through 900°C.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.1.105
|
kci_detailed_000101.xml
|
||
ART001896397
|
oai_dc
|
The analytic solution for parametrically excited oscillators of complex variable in nonlinear dynamic systems under harmonic loading
|
The analytic solution for parametrically excited oscillators of complex variable in nonlinear dynamic systems under harmonic loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mahdi Bayat(Islamic Azad University); Mahmoud Bayat(Islamic Azad University); Iman Pakar(Islamic Azad University)"
] |
In this paper we have considered the vibration of parametrically excited oscillator with strong cubic positive nonlinearity of complex variable in nonlinear dynamic systems with forcing based on Mathieu-Duffing equation. A new analytical approach called homotopy perturbation has been utilized to obtain the analytical solution for the problem. Runge-Kutta's algorithm is also presented as our numerical solution. Some comparisons between the results obtained by the homotopy perturbation method and Runge-Kutta algorithm are shown to show the accuracy of the proposed method. In has been indicated that the homotopy perturbation shows an excellent approximations comparing the numerical one.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.1.123
|
kci_detailed_000101.xml
|
||
ART001896398
|
oai_dc
|
Nonlinear vibration of thin circular sector cylinder: An analytical approach
|
Nonlinear vibration of thin circular sector cylinder: An analytical approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Iman Pakar(Islamic Azad University); Mahmoud Bayat(Islamic Azad University); Mahdi Bayat(Islamic Azad University)"
] |
In this paper, we try to prepare an accurate analytical solution for solving nonlinear vibration of thin circular sector cylinder. A new approximate solution called variational approach is presented and correctly applied to the governing equation of thin circular sector cylinder. The effect of important parameters on the response of the problem is considered. Some comparisons have been presented between the numerical solution and the present approach. The results show an excellent agreement between these methods. It has been illustrated that the variational approach can be a useful method to solve nonlinear problems by considering the effects of important parameters.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.1.133
|
kci_detailed_000101.xml
|
||
ART001896391
|
oai_dc
|
Analytical study of slant end-plate connection subjected to elevated temperatures
|
Analytical study of slant end-plate connection subjected to elevated temperatures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"F. Zahmatkesh(Universiti Teknologi Malaysia); M.H. Osman(Universiti Teknologi Malaysia); E. Talebi(Universiti Teknologi Malaysia); A.B.H. Kueh(Universiti Teknologi Malaysia)"
] |
Due to thermal expansion, the structural behaviour of beams in steel structures subjected to temperature increase will be affected. This may result in the failure of the structural members or connection due to extra internal force in the beam induced by the thermal increase. A method to release some of the thermally generated internal force in the members is to allow for some movements at the end supports of the member. This can be achieved by making the plane of the end-plate of the connection slanted instead of vertical as in conventional design. The present paper discusses the mechanical behaviour of beams with bolted slant end-plate connection under symmetrical gravity loads, subjected to temperature increase. Analyses have been carried out to investigate the reduction in internal force with various angles of slanting, friction factor at the surface of the connection, and allowable temperature increase in the beam. The main conclusion is that higher thermal increase is tolerable when slanting connection is used, which means the risk of failure of structures can be reduced.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2014.17.1.047
|
kci_detailed_000101.xml
|
||
ART002128640
|
oai_dc
|
Seismic behavior of concentrically steel braced frames and their use in strengthening of reinforced concrete frames by external application
|
Seismic behavior of concentrically steel braced frames and their use in strengthening of reinforced concrete frames by external application
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Alptug Unal(Selcuk University); Mevlut Yasar Kaltakci(Hasan Kalyoncu University)"
] |
There are many studies in the literature conducted on the subject of ensuring earthquake safety of reinforced concrete and steel structures using steel braced frames, but no detailed study concerning individual behavior of steel braced frames under earthquake loads and strengthening of reinforced concrete structures with out-of-plane steel braced frames has been encountered. In this study, in order to evaluate behaviors of "Concentrically Steel Braced Frames" types defined in TEC-2007 under lateral loads, dimensional analysis of Concentrically Steel Braced Frames designed with different scales and dimensions was conducted, the results were controlled according to TEC-2007, and after conducting static pushover analysis, behavior and load capacity of the Concentrically Steel Braced Frames and hinges sequence of the elements constituting the Concentrically Steel Braced Frames were tested. Concentrically Steel Braced Frames that were tested analytically consist of 2 storey and one bay, and are formed as two groups with the scales 1/2 and 1/3. In the study, Concentrically Steel Braced Frames described in TEC-2007 were designed, which are 7 types in total being non-braced, X-braced, V- braced, Λ- braced, \- braced, /- braced and K- braced. Furthermore, in order to verify accuracy of the analytic studies performed, the 1/2 scaled concentrically steel X-braced frame test element made up of box profiles and 1/3 scaled reinforced concrete frame with insufficient earthquake resistance were tested individually under lateral loads, and test results were compared with the results derived from analytic studies and interpreted. Similar results were obtained from both experimental studies and pushover analyses. According to pushover analysis results, load-carrying capacity of 1/3 scaled reinforced concrete frames increased up to 7,01 times as compared to the non-braced specimen upon strengthening. Results acquired from the study revealed that reinforced concrete buildings which have inadequate seismic capacity can be strengthened quickly, easily and economically by this method without evacuating them.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.4.987
|
kci_detailed_000101.xml
|
||
ART002128643
|
oai_dc
|
Behavior of light weight sandwich panels under out of plane bending loading
|
Behavior of light weight sandwich panels under out of plane bending loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Chitra Ganapathi(CSIR- SERC); J. Annie Peter(CSIR- SERC); N. Lakshmanan(CSIR- SERC); N.R. Iyer(CSIR- SERC)"
] |
This paper presents the flexural behavior & ultimate strength performance of innovative light weight sandwich panels of size 3×1.2 m with two different solidity ratios viz. 0.5 and 0.33 under out of plane bending load. From the experimental studies, it is observed that the flexural strength and the stiffness are increased by about 46% and five folds for lesser solidity ratio case. From the measured strains of the shear connectors, full shear transfer between the concrete wythes is observed. The yielding occurred approximately at 4% and 0.55% of the ultimate deformation for 100 mm & 150 mm thick panels, which shows the large ductility characteristics of the panels. From the study, it is inferred that the light weight sandwich panels behave structurally in a very similar manner to reinforced concrete panels. Further from the numerical study, it is observed that the numerical values obtained by FE analysis are in good agreement with the experimental observations.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.4.775
|
kci_detailed_000101.xml
|
||
ART002128644
|
oai_dc
|
Analytical solution of a two-dimensional thermoelastic problem subjected to laser pulse
|
Analytical solution of a two-dimensional thermoelastic problem subjected to laser pulse
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ibrahim A. Abbas(University Of Jeddah); Faris S. Alzahrani(King Abdulaziz University)"
] |
In this article, the problem of a two-dimensional thermoelastic half-space are studied using mathematical methods under the purview of the generalized thermoelastic theory with one relaxation time is studied. The surface of the half-space is taken to be thermally insulated and traction free. Accordingly, the variations of physical quantities due to by laser pulse given by the heat input. The nonhomogeneous governing equations have been written in the form of a vector-matrix differential equation, which is then solved by the eigenvalue approach. The analytical solutions are obtained for the temperature, the components of displacement and stresses. The resulting quantities are depicted graphically for different values of thermal relaxation time. The result provides a motivation to investigate the effect of the thermal relaxation time on the physical quantities.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.4.791
|
kci_detailed_000101.xml
|
||
ART002128645
|
oai_dc
|
Global seismic performance of a new precast CFST column to RC beam braced frame: Shake table test and numerical study
|
Global seismic performance of a new precast CFST column to RC beam braced frame: Shake table test and numerical study
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Z.L. Li(Chongqing University); S.Y. Xu(Chongqing University); H.J. Liu(Chongqing University)"
] |
A new type of precast CFST column to RC beam braced frame is proposed in this paper. A series of shake table tests were conducted to excite a one-third scale six-story model for investigating the global seismic performance of this type of structure against earthquake actions. Particular emphasis was given to its dynamic property, global seismic responses and failure path. Correspondingly, a numerical model built on the basis of fiberbeam- element model, multi-layer shell model and element-deactivation method was developed to simulate the seismic performance of the prototype structure. Numerical results were compared with the measured values from shake table tests to verify the validity and reliability of the numerical model. The results demonstrated that the proposed novel precast CFST column to RC beam braced frame performs excellently under strong earthquake excitations; the "strong CFST column-weak RC beam" and "strong connection-weak member" anti-seismic design principles can be easily achieved; the maximum deflections of precast CFSTC-RCB braced frame satisfied the deflection limitations proposed in national code; the numerical model can properly simulate the dynamic property and responses of the precast CFSTC-RCB braced frame that are highly concerned in engineering practice.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.4.805
|
kci_detailed_000101.xml
|
||
ART002128646
|
oai_dc
|
Study on flexural capacity of simply supported steel-concrete composite beam
|
Study on flexural capacity of simply supported steel-concrete composite beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Fa-Xing Ding(Central South University); Jing Liu(Central South University); Xuemei Liu(Queensland University of Technology); Zhi-wu Yu(Central South University)"
] |
This paper investigates the flexural capacity of simply supported steel-concrete composite I beam and box beam under positive bending moment through combined experimental and finite element (FE) modeling. 24 composite beams are included into the experiments and parameters including shear connection degree, transverse reinforcement ratio, section form of girder, diameter of stud and loading way are also considered and investigated. ABAQUS is employed to establish FE models to simulate the behavior of composite beams. The influences of a few key parameters, such as the shear connection degree, stud arrangement, stud diameter, beam length and loading way, on flexural capacity are discussed. In addition, three methods including GB standard, Eurocode 4, and Nie method are also used to estimate the flexural capacity of composite beams and also for comparison with experimental and numerical results. The results indicate that Nie method may provide a better estimation in comparison to other two standards.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.4.829
|
kci_detailed_000101.xml
|
||
ART002128647
|
oai_dc
|
Buckling behaviours of functionally graded polymeric thin-walled hemispherical shells
|
Buckling behaviours of functionally graded polymeric thin-walled hemispherical shells
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mine U. Uysal(Yildiz Technical University)"
] |
This paper investigates the static buckling behaviours of Functionally Gradient Polymeric Material (FGPM) shells in the form of hemispherical segment. A new FGPM model based on experimental was considered to investigate the buckling problem of thin-walled spherical shells loaded by the external pressure. The spherical shells were formed by FGPM which was produced adding the two types of graphite powders into epoxy resin. The graphite powders were added to the epoxy resin as volume of 3, 6, 9, and 12%. Halpin-Tsai and Paul models were used to determine the elastic moduli of the parts of FGPM. The detailed static buckling analyses were performed by using finite element method. The influences of the types and volume of graphite powders on the buckling behaviour of the FGPM structures were investigated. The buckling loads of hemispherical FGPM shells based on Halpin-Tsai and Paul models were compared with those determined from the analytical solution of non-graphite condition existing for homogeneous material model. The comparisons between these material models showed that Paul model was overestimated. Besides, the critical buckling loads were predicted. The higher critical buckling loads were estimated for the PV60/65 graphite powder due to the compatible of the PV60/65 graphite powder with resin.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.4.849
|
kci_detailed_000101.xml
|
||
ART002128648
|
oai_dc
|
Cable-pulley brace to improve story drift distribution of MRFs with large openings
|
Cable-pulley brace to improve story drift distribution of MRFs with large openings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Seyed Amin Mousavi(University of Tehran); Seyed Mehdi Zahrai(University of Tehran)"
] |
This study aims to introduce a new bracing system by which even super-wide frames with large openings can be braced. The proposed system, hereafter called Cable-Pulley Brace (CPB), is a tension-only bracing system with a rectilinear configuration. In CPB, a wire rope passes through a rectilinear path around the opening(s) and connects the lower corner of the frame to its opposite upper one. CPB is a secondary load resisting system with a nonlinear-elastic hysteretic behavior due to its initial pre-tension load. As a result, the required energy dissipation would be provided by the MRF itself, and the main intention of using CPB is to contribute to the initial and post-yield stiffness of the whole system. Using a stiffness calibration technique, optimum placement of the CPBs is discussed to yield a uniform displacement demand along the height of the structure. A displacement-based design procedure is proposed by which the MRF with CPB can be designed to achieve a uniform distribution of inter-story drifts with predefined values. Obtained results indicated that CPB leads to significant reductions in maximum and residual deformations of the MRF at the expense of minor increase in the maximum base shear and developed axial force demands in the columns. In the case of a typical 5-story residential building, compared to SMRF system, CPB system reduces maximum amounts of inter-story and residual drifts by 35% and 70%, respectively. Moreover, openings of the frame are not interrupted by the CPB. This is the most appealing feature of the proposed bracing system from architectural point of view.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.4.863
|
kci_detailed_000101.xml
|
||
ART002128649
|
oai_dc
|
Analytical solution for buckling of embedded laminated plates based on higher order shear deformation plate theory
|
Analytical solution for buckling of embedded laminated plates based on higher order shear deformation plate theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vahid Baseri(Islamic Azad University); Gholamreza Soleimani Jafari(Islamic Azad University); Reza Kolahchi(Islamic Azad University)"
] |
In this research, buckling analysis of an embedded laminated composite plate is investigated. The elastic medium is simulated with spring constant of Winkler medium and shear layer. With considering higher order shear deformation theory (Reddy), the total potential energy of structure is calculated. Using Principle of Virtual Work, the constitutive equations are obtained. The analytical solution is performed in order to obtain the buckling loads. A detailed parametric study is conducted to elucidate the influences of the layer numbers, orientation angle of layers, geometrical parameters, elastic medium and type of load on the buckling load of the system. Results depict that the highest buckling load is related to the structure with angle-ply orientation type and with increasing the angle up to 45 degrees, the buckling load increases.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.4.883
|
kci_detailed_000101.xml
|
||
ART002128650
|
oai_dc
|
Axial compressive behaviour of circular CFFT: Experimental database and design-oriented model
|
Axial compressive behaviour of circular CFFT: Experimental database and design-oriented model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Qasim S. Khan(University of Wollongong); M. Neaz Sheikh(University of Wollongong); Muhammad N.S. Hadi(University of Wollongong)"
] |
Concrete Filled Fibre Reinforced Polymer Tube (CFFT) for new columns construction has attracted significant research attention in recent years. The CFFT acts as a formwork for new columns and a barrier to corrosion accelerating agents. It significantly increases both the strength capacity (Strength enhancement ratio) and the ductility (Strain enhancement ratio) of reinforced concrete columns. In this study, based on predefined selection criteria, experimental investigation results of 134 circular CFFT columns under axial compression have been compiled and analysed from 599 CFFT specimens available in the literature. It has been observed that actual confinement ratio (expressed as a function of material properties of fibres, diameter of CFFT and compressive strength of concrete) has significant influence on the strength and ductility of circular CFFT columns. Design oriented models have been proposed to compute the strength and strain enhancement ratios of circular CFFT columns. The proposed strength and strain enhancement ratio models have significantly reduced Average Absolute Error (AAE), Mean Square Error (MSE), Relative Standard Error of Estimate (RSEE) and Standard Deviation (SD) as compared to other available strength and strain enhancement ratios of circular CFFT column models. The predictions of the proposed strength and strain enhancement ratio models match well with the experimental strength and strain enhancement ratios investigation results in the compiled database.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.4.921
|
kci_detailed_000101.xml
|
||
ART002128651
|
oai_dc
|
Analysis of large deformation and fatigue life of fabric braided composite hose subjected to cyclic loading
|
Analysis of large deformation and fatigue life of fabric braided composite hose subjected to cyclic loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J.R. Cho(Hongik University); Y.H. Kim(Pusan National University)"
] |
The braking hose in the automotive hydraulic braking system exhibits the complicated anisotropic large deformation while its movable end is moving along the cyclic path according to the steering and bump/rebound motions of vehicle. The complicated large deformation may cause not only the interference with other adjacent automotive parts but also the durability problem resulting in the fatal microcraking. In this regard, the design of highdurable braking hose with the interference-free layout becomes a hot issue in the automotive industry. However, since it has been traditionally relied on the cost-/time-consuming trial and error experiments, the cost- and timeeffective optimum design method that can replace the experiment is highly desirable. Meanwhile, the hose deformed configuration and fatigue life are different for different hose cyclic paths, so that their characteristic investigation becomes an important preliminary research subject. As a preliminary step for developing the optimum design methodology, we in this study investigate the hose deformed configuration and the fatigue life for four representative hose cyclic paths.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.4.949
|
kci_detailed_000101.xml
|
||
ART002128641
|
oai_dc
|
Evaluation of AF type cyclic plasticity models in ratcheting simulation of pressurized elbow pipes under reversed bending
|
Evaluation of AF type cyclic plasticity models in ratcheting simulation of pressurized elbow pipes under reversed bending
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiaohui Chen(Northeastern University); Bingjun Gao(Hebei University of Technology); Xu Chen(Tianjin University)"
] |
The ratcheting behavior was studied experimentally for Z2CND18.12N elbow piping under cyclic bending and steady internal pressure. Dozens of cyclic plasticity models for structural ratcheting responses simulations were used in the paper. The four models, namely, Bilinear (BKH), Multilinear (MKIN/KINH), Chaboche (CH3), were already available in the ANSYS finite element package. Advanced cyclic plasticity models, such as, modified Chaboche (CH4), Ohno-Wang, modified Ohno-Wang, Abdel Karim-Ohno and modified Abdel Karim-Ohno, were implemented into ANSYS for simulating the experimental responses. Results from the experimental and simulation studies were presented in order to demonstrate the state of structural ratcheting response simulation by these models. None of the models evaluated perform satisfactorily in simulating circumferential strain ratcheting response. Further, improvement in cyclic plasticity modeling and incorporation of material and structural features, like time-dependent, temperature-dependent, non-proportional, dynamic strain aging, residual stresses and anisotropy of materials in the analysis would be essential for advancement of low-cycle fatigue simulations of structures.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.4.703
|
kci_detailed_000101.xml
|
||
ART002128642
|
oai_dc
|
A high-order analytical method for thick composite tubes
|
A high-order analytical method for thick composite tubes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hamidreza Yazdani Sarvestani(Concordia University); Mehdi Hojjati(Concordia University)"
] |
In the present paper, a new high-order simple-input analytical method is used to study thick laminated composite straight tubes subjected to combined axial force, torque and bending moment. The most general displacement field of elasticity for an arbitrary laminated composite straight tube is obtained to analytically calculate stresses under combined loadings based on a layerwise method. The accuracy of the proposed method is subsequently verified by comparing the numerical results obtained using the proposed method with finite element method (FEM) and experimental data. The results show good corresponded. The proposed method provides advantages in terms of computational time compared to FEM.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.21.4.755
|
kci_detailed_000101.xml
|
||
ART002100486
|
oai_dc
|
Probabilistic elastic-plastic analysis of repaired cracks with bonded composite patch
|
Probabilistic elastic-plastic analysis of repaired cracks with bonded composite patch
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mourad Chama(University of Sidi Bel Abbes); Belaïd Mechab(University of Sidi Bel Abbes); Khacem Kaddouri(University of Sidi Bel Abbes); Djelloul Slimani(University of Sidi Bel Abbes)"
] |
The objective of this work was to evaluate the ductile cracked structures with bonded composite patch used in probabilistic elastic plastic fracture mechanics subjected to tensile load. The finite element method is used to analyze the stress intensity factors for elastic case, the effect of cracks and the thickness of the patch (<i>e<sub>r</sub></i>) are presented for calculating the stress intensity factors. For elastic-plastic the Monte Carlo method is used to predict the distribution function of the mechanical response. According to the obtained results, we note that the stress variations are important factors influencing on the distribution function of (J/Je).
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1173
|
kci_detailed_000101.xml
|
||
ART002100487
|
oai_dc
|
Investigation on the failure mechanism of steel-concrete steel composite beam
|
Investigation on the failure mechanism of steel-concrete steel composite beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guang P. Zou(Harbin Engineering University); Pei X. Xia,(Harbin Engineering University); Xin H. Shen(Harbin Engineering University); Peng Wang(Harbin Engineering University)"
] |
The internal crack propagation, the failure mode and ultimate load bearing capacity of the steelconcrete-steel composite beam under the four-point-bend loading is investigated by the numerical simulation. The results of load - displacement curve and failure mode are in good agreement with experiment. In order to study the failure mechanism, the composite beam has been modeled, which part interface interaction between steel and concrete is considered. The results indicate that there are two failure modes: (a) When the strength of the interface is lower than that of the concrete, failure happens at the interface of steel and concrete;(b) When the strength of the interface is higher than that of the concrete, the failure modes is cohesion failure, i.e., and concrete are stripped because of the shear cracks at concrete edge.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1183
|
kci_detailed_000101.xml
|
||
ART002100488
|
oai_dc
|
Analytical evaluation of a modular CFT bridge pier according to directivity
|
Analytical evaluation of a modular CFT bridge pier according to directivity
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Dongwook Kim(Chung Ang University); Chiho Jeon(Chung Ang University); Changsu Shim(Chung Ang University)"
] |
This paper focuses on the analytical behavior of modular circular concrete-filled tubular (CFT) column with enhanced bracing details. To design a full-scale bridge pier of multiple circular concrete-filled tubes, numerical analysis was used to evaluate structural performance according to load directivity. In previous research (Ma <i>et al</i>. 2012, Shim <i>et al</i>. 2014), low cycle fatigue failure at bracing joints was observed, so enhanced bracing details to prevent premature failure are proposed in this analysis. The main purpose of this research is to investigate seismic performance for the diagonal direction load without premature failure at the joints when the structure reaches the ultimate load. The ABAQUS finite-element software is used to evaluate experimental performance. A quasi-static loading condition on a modular bridge pier is introduced to investigate structural performance. The results obtained from the analysis are evaluated by comparing with load.displacement responses from experiments. The concretefilled tubes with enhanced bracing details showed higher energy dissipation capacity and proper performance without connection failure for a diagonal load.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1193
|
kci_detailed_000101.xml
|
||
ART002100489
|
oai_dc
|
Hysteretic behavior studies of self-centering energy dissipation bracing system
|
Hysteretic behavior studies of self-centering energy dissipation bracing system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Long-He Xu(Beijing Jiaotong University); Xiaowei Fan(Beijing Jiaotong University); Dengcheng Lu(Beijing Jiaotong University); Zhong-Xian Li(Tianjin University)"
] |
This paper presents a new type of pre-pressed spring self-centering energy dissipation (PS-SCED) bracing system that combines friction mechanisms between the inner and outer tube members to provide the energy dissipation with the pre-pressed combination disc springs installed on both ends of the brace to provide the selfcentering capability. The mechanics and the equations governing the design and hysteretic responses of the bracing system are outlined, and a series of validation tests of components comprising the self-centering mechanism of combination disc springs, the friction energy dissipation mechanism, and a large scale PS-SCED bracing specimen were conducted due to the low cyclic reversed loadings. Experimental results demonstrate that the proposed bracing system performs as predicted by the equations governing its mechanical behaviors, which exhibits a stable and repeatable flag-shaped hysteretic response with excellent self-centering capability and appreciable energy dissipation, and large ultimate bearing and deformation capacities. Results also show that almost no residual deformation occurs when the friction force is less than the initial pre-pressed force of disc springs.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1205
|
kci_detailed_000101.xml
|
||
ART002100490
|
oai_dc
|
Cyclic and static behaviors of CFT modular bridge pier with enhanced bracings
|
Cyclic and static behaviors of CFT modular bridge pier with enhanced bracings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Dongwook Kim(Chung Ang University); Chiho Jeon(Chung Ang University); Changsu Shim(Chung Ang University)"
] |
Modular structures consist of standardized modules and their connections. A modular bridge pier is proposed to accelerate bridge construction. Multiple concrete-filled steel tubes (CFTs) using commercial steel tubes were chosen as the main members. Buckling restrained bracings and enhanced connection details were designed to prevent premature low-cycle fatigue failure upon cyclic loading. The pier had a height of 7.95 m, widths of 2.5 m and 2.0 m along the strong and weak axis, respectively. Cyclic tests were performed on the modular pier to investigate structural performance. Test results showed that four CFT columns reached yielding without a premature failure of the bracing connections. The ultimate capacity of the modular pier was reasonably estimated based on the plastichinge- analysis concept. The modular CFT pier with enhanced bracing showed improved displacement ductility without premature failure at the welding joints.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1221
|
kci_detailed_000101.xml
|
||
ART002100491
|
oai_dc
|
Analysis of concrete shrinkage along truss bridge with steel-concrete composite deck
|
Analysis of concrete shrinkage along truss bridge with steel-concrete composite deck
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wojciech Siekierski(Poznań University of Technology)"
] |
The paper concerns analysis of effects of shrinkage of slab concrete in a steel-concrete composite deck of a through truss bridge span. Attention is paid to the shrinkage alongside the span, i.e., transverse to steel-concrete composite cross-beams. So far this aspect has not been given much attention in spite of the fact that it affects not only steel-concrete decks of bridges but also steel-concrete floors of steel frame building structures. For the problem analysis a two-dimensional model is created. An analytical method is presented in detail. A set of linear equations is built to compute axial forces in members of truss girder flange and transverse shear forces in steel-concrete composite beams. Finally a case study is shown: test loading of twin railway truss bridge spans is described, verified FEM model of the spans is presented and computational results of FEM and the analytical method are compared. Conclusions concerning applicability of the presented analytical method to practical design are drawn. The presented analytical method provides satisfactory accuracy of results in comparison with the verified FEM model.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1237
|
kci_detailed_000101.xml
|
||
ART002100492
|
oai_dc
|
Seismic performances of centrifugally-formed hollow-core precast columns with multi-interlocking spirals
|
Seismic performances of centrifugally-formed hollow-core precast columns with multi-interlocking spirals
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"황진하(서울시립대학교); 김강수(서울시립대학교); 이득행(서울시립대학교); 오재열(서울시립대학교); 최승호(서울시립대학교); 서수연(한국교통대학교)"
] |
A precast composite column system has been developed in this study by utilizing multi interlocking spiral steel into a centrifugally-formed hollow-core precast (CHPC) column. The proposed hybrid column system can have enhanced performances in the composite interaction behavior between the hollowed precast column and cast-in-place (CIP) core-filled concrete, the lap splice performance of bundled bars, and the confining effect of concrete. In the experimental program, reversed cyclic loading tests were conducted on a conventional reinforced concrete (RC) column fabricated monolithically, two CHPC columns filled with CIP concrete, and two steelreinforced concrete (SRC) columns. It was confirmed that the interlocking spirals was very effective to enhance the structural performance of the CHPC column, and all the hollow-core precast column specimens tested in this study showed good seismic performances comparable to the monolithic control specimen.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1259
|
kci_detailed_000101.xml
|
||
ART002100493
|
oai_dc
|
Investigation of the effects of connectors to enhance bond strength of externally bonded steel plates and CFRP laminates with concrete
|
Investigation of the effects of connectors to enhance bond strength of externally bonded steel plates and CFRP laminates with concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali Sami Abdul Jabbar(Universiti Tenaga Nasional); Md Ashraful Alam(Universiti Tenaga Nasional); Kamal Nasharuddin Mustapha(Universiti Tenaga Nasional)"
] |
Steel plates and carbon-fiber-reinforced polymer (CFRP) laminates or plates bonded to concrete substrates have been widely used for concrete strengthening. However, this technique cause plate debonding, which makes the strengthening system inefficient. The main objective of this study is to enhance the bond strength of externally bonded steel plates and CFRP laminates to the concrete surface by proposing new embedded adhesive and steel connectors. The effects of these new embedded connectors were investigated through the tests on 36 prism specimens. Parameters such as interfacial shear stress, fracture energy and the maximum strains in plates were also determined in this study and compared with the maximum value of debonding stresses using a relevant failure criterion by means of pullout test. The study indicates that the interfacial bond strength between the externally bonded plates and concrete can be increased remarkably by using these connectors. The investigation verifies that steel connectors increase the shear bond strength by 48% compared to 38% for the adhesive connectors. Thus, steel connectors are more effective than adhesive connectors in increasing shear bond strength. Results also show that the use of double connectors significantly increases interfacial shear stress and decrease debonding failure. Finally, a new proposed formula is modified to predict the maximum bond strength of steel plates and CFRP laminates adhesively glued to concrete in the presence of the embedded connectors.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1275
|
kci_detailed_000101.xml
|
||
ART002100494
|
oai_dc
|
Structural behavior of partially encased composite columns under axial loads
|
Structural behavior of partially encased composite columns under axial loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Margot F. Pereira(University of Sao Paulo); Silvana De Nardin(Federal University of Sao Carlos); Ana L.H.C. El Debs(University of Sao Paulo)"
] |
This paper presents the results of experimental and numerical model analyses on partially encased composite columns under concentric loads. The main objective of this study is to evaluate the influence of replacing the conventional longitudinal and transverse steel bars by welded wire mesh on the structural behavior of these members under concentric loads. To achieve these goals experimental tests on four specimens of partially encased composite columns submitted to axial loading were performed and the results were promising in terms of replacing the traditional reinforcement by steel meshes. In addition, a numerical FE model was developed using the software DIANA® with FX+. The experimental results were used to validate the numerical model. Satisfactory agreement between experimental and numerical results was observed in both capacity and deformability of the composite columns. Despite of the simplifying assumptions of perfect bond between steel and concrete, the numerical model adequately represented the columns behavior. A finite element parametric study was performed and parameters including thickness of the steel profile and the concrete and steel strengths were evaluated. The parametrical study results found no significant changes in the partially encased columns behavior due to variations of the steel profile thickness or yield strength. However, significant changes in the post peak behavior were observed when using high strength concrete and these results suggest a change in the failure mode.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1305
|
kci_detailed_000101.xml
|
||
ART002100495
|
oai_dc
|
Numerical studies on behaviour of bolted ball-cylinder joint under axial force
|
Numerical studies on behaviour of bolted ball-cylinder joint 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.)"
] |
This paper presents the results of an extensive numerical analysis program devoted to the investigation of the mechanical behaviour of bolted ball-cylinder joints. The analysis program is developed by means of finite element (FE) models implemented in the non-linear code ABAQUS. The FE models have been accurately calibrated on the basis of available experimental results. It is indicated that the FE models could be used effectively to describe the mechanical performance of bolted ball-cylinder joints, including failure modes, stress distributions and loaddisplacement curves. Therefore, the proposed FE models could be regarded as an efficient and accurate tool to investigate the mechanical behavior of bolted ball-cylinder joints. In addition, to develop a further investigation, parametric studies were performed, varying the dimensions of hollow cylinders, rectangular tubes, convex washers and ribbed stiffener. It is found that the dimensions of hollow cylinders, rectangular tubes and ribbed stiffener influenced the mechanical behaviour of bolted ball-cylinder joints significantly. On the contrary, the effects of the dimensions of convex washers were negligible.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1323
|
kci_detailed_000101.xml
|
||
ART002100496
|
oai_dc
|
Probabilistic-based assessment of composite steel-concrete structures through an innovative framework
|
Probabilistic-based assessment of composite steel-concrete structures through an innovative framework
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"José C. Matos(University of Minho); Isabel B. Valente(University of Minho Azurém); Paulo J.S. Cruz(University of Minho Azurém); Vicente N. Moreira(University of Minho)"
] |
This paper presents the probabilistic-based assessment of composite steel-concrete structures through an innovative framework. This framework combines model identification and reliability assessment procedures. The paper starts by describing current structural assessment algorithms and the most relevant uncertainty sources. The developed model identification algorithm is then presented. During this procedure, the model parameters are automatically adjusted, so that the numerical results best fit the experimental data. Modelling and measurement errors are respectively incorporated in this algorithm. The reliability assessment procedure aims to assess the structure performance, considering randomness in model parameters. Since monitoring and characterization tests are common measures to control and acquire information about those parameters, a Bayesian inference procedure is incorporated to update the reliability assessment. The framework is then tested with a set of composite steel-concrete beams, which behavior is complex. The experimental tests, as well as the developed numerical model and the obtained results from the proposed framework, are respectively present.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1345
|
kci_detailed_000101.xml
|
||
ART002100497
|
oai_dc
|
Flexural stiffness of steel-concrete composite beam under positive moment
|
Flexural stiffness of steel-concrete composite beam under positive moment
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Fa-Xing Ding(Central South University); Jing Liu(Central South University); Xuemei Liu(Queensland University of Technology); Feng-Qi Guo(Central South University); Li-Zhong Jiang(National Engineering Laboratory for High)"
] |
This paper investigates the flexural stiffness of simply supported steel-concrete composite I-beams under positive bending moment through combined experimental, numerical, and different standard methods. 14 composite beams are tested for experimental study and parameters including shear connection degree, transverse and longitudinal reinforcement ratios, loading way are also investigated. ABAQUS is employed to establish finite element (FE) models to simulate the flexural behavior of composite beams. The influences of a few key parameters, such as the shear connection degree, stud arrangement, stud diameter, beam length, loading way, on the flexural stiffness is also studied by parametric study. In addition, three widely used standard methods including GB, AISC, and British standards are used to estimate the flexural stiffness of the composite beams. The results are compared with the experimental and numerical results. The findings have provided comprehensive understanding of the flexural stiffness and the modelling of the composite beams. The results also indicate that GB 50017-2003 could provide better results in comparison to the other standards.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1369
|
kci_detailed_000101.xml
|
||
ART002100511
|
oai_dc
|
Experimental and numerical studies on the frame-infill in-teraction in steel reinforced recycled concrete frames
|
Experimental and numerical studies on the frame-infill in-teraction in steel reinforced recycled concrete frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jian-yang Xue(Xi’an University of Architecture and Technology); Xiaogang Huang(Xi’an University of Architecture and Tec); Zheng Luo(Xi’an University of Architecture and Tec); Liang Gao(Xi’an University of Architecture and Technology)"
] |
Masonry infill has a significant effect on stiffness contribution, strength and ductility of masonry-infilled frames. These effects may cause damage of weak floor, torsional damage or short-column failure in structures. This article presents experiments of 1/2.5-scale steel reinforced recycled aggregates concrete (SRRC) frames. Three specimens, with different infill rates consisted of recycled concrete hollow bricks (RCB), were subjected to static cyclic loads. Test phenomena, hysteretic curves and stiffness degradation of the composite structure were analyzed. Furthermore, effects of axial load ratio, aspect ratio, infill thickness and steel ratio on the share of horizontal force supported by the frame and the infill were obtained in the numerical example.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.6.1391
|
kci_detailed_000101.xml
|
||
ART002020585
|
oai_dc
|
Using friction dampers in retrofitting a steel structure with masonry infill panels
|
Using friction dampers in retrofitting a steel structure with masonry infill panels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Seyed Mehdi Zahrai(the University of Tehran); Alireza Moradi(Islamic Azad University); Mohammadreza Moradi(Old Dominion University)"
] |
A convenient procedure for seismic retrofit of existing buildings is to use passive control methods, like using friction dampers in steel frames with bracing systems. In this method, reduction of seismic demand and increase of ductility generally improve seismic performance of the structures. Some of its advantages are development of a stable rectangular hysteresis loop and independence on environmental conditions such as temperature and loading rate. In addition to friction dampers, masonry-infill panels improve the seismic resistance of steel structures by increasing lateral strength and stiffness and reducing story drifts. In this study, the effect of masonry-infill panels on seismic performance of a three-span four-story steel frame with Pall friction dampers is investigated. The results show that friction dampers in the steel frame increase the ductility and decrease the drift (to less than 1%). The infill panels fulfill their function during the imposed drift and increase structural strength. It can be concluded that infill panels together with friction dampers, reduced structural dynamic response. These infill panels dissipated input earthquake energy from 4% to 10%, depending on their thickness.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.309
|
kci_detailed_000101.xml
|
||
ART002020586
|
oai_dc
|
Dimensionless analysis of composite rectangular and circular RC columns
|
Dimensionless analysis of composite rectangular and circular RC columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali Massumi(Kharazmi University); Alireza Badkoubeh(Kharazmi University)"
] |
A numerical procedure is presented that provides ultimate curvature and moment domains for composite rectangular and circular cross-sections of reinforced concrete columns with or without an embedded steel section subjected to combined axial loading and biaxial bending. The stress resultants for the concrete and reinforcement bars are calculated using fiber analysis and the stress resultants for the encased structural steel are evaluated using an exact integration of the stress-strain curve over the area of the steel section. A dimensionless formula is proposed that can be used for any section with similar normalized geometric and mechanical parameters. The contribution of each material to the bearing capacity of a section (resistance load and moments) is calculated separately so that the influence of each geometric or mechanical parameter on the bearing capacity can be investigated separately.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.327
|
kci_detailed_000101.xml
|
||
ART002020587
|
oai_dc
|
Optimal placement of elastic steel diagonal braces using artificial bee colony algorithm
|
Optimal placement of elastic steel diagonal braces using artificial bee colony algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"E. Aydin(Nigde University); M. Sonmez(Aksaray University); T. Karabork(Aksaray University)"
] |
This paper presents a new algorithm to find the optimal distribution of steel diagonal braces (SDB) using artificial bee colony optimization technique. The four different objective functions are employed based on the transfer function amplitude of; the top displacement, the top absolute acceleration, the base shear and the base moment. The stiffness parameter of SDB at each floor level is taken into account as design variables and the sum of the stiffness parameter of the SDB is accepted as an active constraint. An optimization algorithm based on the Artificial Bee Colony (ABC) algorithm is proposed to minimize the objective functions. The proposed ABC algorithm is applied to determine the optimal SDB distribution for planar buildings in order to rehabilitate existing planar steel buildings or to design new steel buildings. Three planar building models are chosen as numerical examples to demonstrate the validity of the proposed method. The optimal SDB designs are compared with a uniform SDB design that uniformly distributes the total stiffness across the structure. The results of the analysis clearly show that each optimal SDB placement, which is determined based on different performance objectives, performs well for its own design aim.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.349
|
kci_detailed_000101.xml
|
||
ART002020588
|
oai_dc
|
A computational shear displacement model for vibrational analysis of functionally graded beams with porosities
|
A computational shear displacement model for vibrational analysis of functionally graded beams with porosities
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hassen Ait Atmane(University of Sidi Bel Abbes); Abdelouahed Tounsi(University of Sidi Bel Abbes); Fabrice Bernard(Laboratoire de Génie Civil et Génie Méca); S. R. Mahmoud(King Abdulaziz University)"
] |
This work presents a free vibration analysis of functionally graded metal-ceramic (FG) beams with considering porosities that may possibly occur inside the functionally graded materials (FGMs) during their fabrication. For this purpose, a simple displacement field based on higher order shear deformation theory is implemented. The proposed theory is based on the assumption that the transverse displacements consist of bending and shear components in which the bending components do not contribute toward shear forces and, likewise, the shear components do not contribute toward bending moments. The most interesting feature of this theory is that it accounts for a quadratic variation of the transverse shear strains across the thickness, and satisfies the zero traction boundary conditions on the top and bottom surfaces of the beam without using shear correction factors. In addition, it has strong similarities with Euler-Bernoulli beam theory in some aspects such as equations of motion, boundary conditions, and stress resultant expressions. The rule of mixture is modified to describe and approximate material properties of the FG beams with porosity phases. By employing the Hamilton's principle, governing equations of motion for coupled axial-shear-flexural response are determined. The validity of the present theory is investigated by comparing some of the present results with those of the first-order and the other higher-order theories reported in the literature. Illustrative examples are given also to show the effects of varying gradients, porosity volume fraction, aspect ratios, and thickness to length ratios on the free vibration of the FG beams.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.369
|
kci_detailed_000101.xml
|
||
ART002020589
|
oai_dc
|
Modal parametric changes in a steel bridge with retrofitting
|
Modal parametric changes in a steel bridge with retrofitting
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Suresh Kumar Walia(NIT Hamirpur); Hemant Kumar Vinayak(NIT Hamirpur); Ashok Kumar(IIT Roorkee); Raman Parti(NIT Hamirpur)"
] |
This paper presents the status improvement of an old damaged deck type rural road steel truss bridge through the modal parametric study after partial retrofitting. The dynamic and static tests on bridge were carried out as in damaged state and after partial retrofitting. The dynamic testing on the steel bridge was carried out using accelerometers under similar environmental conditions with same speed of the moving vehicle. The comparison of the modal parameters i.e., frequency, mode shape mode shape curvature, modal strain energy, along with the deflection parameter are studied with respect to structural analytical model parameters. The status up gradation for the upper and downstream truss obtained was different due to differential level of damage in the bridge. Also after retrofitting the structural elemental behavior obtained was not same as desired. The damage level obtained through static tests carried out using total station indicated further retrofitting requirement.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.385
|
kci_detailed_000102.xml
|
||
ART002020590
|
oai_dc
|
Arch-to-beam rigidity analysis for V-shaped rigid frame composite arch bridges
|
Arch-to-beam rigidity analysis for V-shaped rigid frame composite arch bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hongye Gou(Southwest Jiaotong University); Qianhui Pu(Southwest Jiaotong University); Yang Zhou(Southwest Jiaotong University); Yu Hong(Southwest Jiaotong University)"
] |
We proposed the concept of nominal rigidity of a long-span V-shaped rigid frame composite arch bridge, analyzed the effects of structural parameters on nominal rigidity, and derived a theoretical nominal rigidity equation. In addition, we discussed the selection of the arch-to-beam rigidity ratio and its effect on the distribution of internal forces, and analyzed the influence of the ratio on the internal forces. We determined the delimitation value between rigid arch-flexible beam and flexible arch-rigid beam. We summarized the nominal rigidity and arch to beam rigidity ratios of existing bridges. The results show that (1) rigid arch-flexible beam and flexible arch-rigid beam can be defined by the arch-to-beam rigidity ratio; (2) nominal rigidities have no obvious differences among the continuous rigid frame composite arch bridge, V-shaped rigid frame bridge, and arch bridge, which shows that nominal rigidity can reflect the global stiffness of a structure.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.405
|
kci_detailed_000102.xml
|
||
ART002020591
|
oai_dc
|
Low velocity impact behavior of shear deficient RC beam strengthened with CFRP strips
|
Low velocity impact behavior of shear deficient RC beam strengthened with CFRP strips
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Özgür Anıl(Gazi University); Tolga Yılmaz(Eskişehir Osmangazi University)"
] |
Many methods are developed for strengthening of reinforced concrete structural members against the effects of shear. One of the commonly used methods in recent years is turned out to be bonding of fiber reinforced polymers (FRP). Impact loading is one of the important external effects on the reinforced concrete structural members during service period among the others. The determination of magnitude, the excitation time, deformations and stress due to impact loadings are complicated and rarely known. In recent year impact behavior of reinforced concrete members have been researched with experimental studies by using drop-weight method and numerical simulations are done by using finite element method. However the studies on the strengthening of structural members against impact loading are very seldom in the literature. For this reason, in this study impact behavior of shear deficient reinforced concrete beams that are strengthened with carbon fiber reinforced polymers (CFRP) strips are investigated experimentally. Compressive strength of concrete, CFRP strips spacing and impact velocities are taken as the variables in this experimental study. The acceleration due to impact loading is measured from the specimens, while velocities and displacements are calculated from these measured accelerations. RC beams are modeled with ANSYS software. Experimental result and simulations result are compared. Experimental result showed that impact behaviors of shear deficient RC beams are positively affected from the strengthening with CFRP strip. The decrease in the spacing of CFRP strips reduced the acceleration, velocity and displacement values measured from the test specimens.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.417
|
kci_detailed_000102.xml
|
||
ART002020592
|
oai_dc
|
Flexural and compression behavior for steel structures strengthened with Carbon Fiber Reinforced Polymers (CFRPs) sheet
|
Flexural and compression behavior for steel structures strengthened with Carbon Fiber Reinforced Polymers (CFRPs) sheet
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"박재우(서울대학교); 유정한(서울대학교)"
] |
This paper presents the experimental results of flexural and compression steel members strengthened with carbon fiber reinforced polymers (CFRP) sheets. In the flexural test, the five specimens were fabricated and the test parameters were the number of CFRP ply and the ratio of partial-length bonded CFRP sheets of specimen. The CFRP sheet strengthened steel beam had failure mode: CFRP sheet rupture at the mid span of steel beams. A maximum increase of 11.3% was achieved depending on the number of CFRP sheet ply and the length of CFRP sheet. In the compression test, the nine specimens were fabricated and the main parameters were: width-thickness ratio (b/t), the number of CFRP ply, and the length of the specimen. From the tests, for short columns it was observed that two sides would typically buckle outward and the other two sides would buckle inward. Also, for long columns, overall buckling was observed. A maximum increase of 57% was achieved in axial-load capacity when 3 layers of CFRP were used to wrap HSS columns of b/t = 60 transversely.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.441
|
kci_detailed_000102.xml
|
||
ART002020593
|
oai_dc
|
Effect of semi-rigid connections in improvement of seismic performance of steel moment-resisting frames
|
Effect of semi-rigid connections in improvement of seismic performance of steel moment-resisting frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Gholipour Feizi(University of Tabriz); A. Mojtahedi(University of Tabriz); V. Nourani(University of Tabriz)"
] |
Seismic performances of dual steel moment-resisting frames with mixed use of rigid and semi-rigid connections were investigated to control of the base shear, story drifts and the ductility demand of the elements. To this end, nonlinear seismic responses of three groups of frames with three, eight and fifteen story were evaluated. These frames with rigid, semi-rigid and combined configuration of rigid and semi-rigid connections were analyzed under five earthquake records and their responses were compared in ultimate limit state of rigid frame. This study showed that in all frames, it could be found a state of semi-rigidity and connections configuration which behaved better than rigid frame, with consideration of the base shear and story drifts criterion. Finally, some criteria were suggested to locate the best place of the semi-rigid connections for improvement of the seismic performance of steel moment-resisting frames.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.467
|
kci_detailed_000102.xml
|
||
ART002020594
|
oai_dc
|
Analytical study of composite beams with different arrangements of channel shear connectors
|
Analytical study of composite beams with different arrangements of channel shear connectors
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nader Fanaie(K.N.Toosi University of Technology); Farzaneh Ghalamzan Esfahani(K. N. Toosi University of Technology); Soheil Soroushnia(Islamic Azad University)"
] |
Channels are implemented in composite beams as shear connectors in two arrangements, face to face and back to back. No relevant explanation is found in the design codes to clarify the preference of the mentioned arrangements. Besides, the designers do not have a common opinion on this subject; i.e., some recommend the face to face and others, back to back status. In this research, channel shear connectors in composite beams are studied analytically for both arrangements using ABAQUS software. For this purpose, they have been modeled in simply supported beams in the arrangements of face to face and back to back; their effects on the crack initiation load of concrete slabs were monitored. The stiffness values of composite beams were also compared in the two arrangements using force-displacement curve; the results are relatively the same in both cases. Furthermore, the effects of compressive strength of concrete, channel size, length and spacing of channels as well as steel type of channels on the performance of composite beams have been investigated. According to the results obtained in this research, the face to face status shows better performance in comparison with that of back to back, considering the load of concrete fracturing.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.485
|
kci_detailed_000102.xml
|
||
ART002020595
|
oai_dc
|
Optimum design of steel space frames with composite beams using genetic algorithm
|
Optimum design of steel space frames with composite beams using genetic algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Musa Artar(Bayburt University); Ayşe T. Daloğlu(Karadeniz Technical University)"
] |
This paper presents an optimization process using Genetic Algorithm (GA) for minimum weight by selecting suitable standard sections from a specified list taken from American Institute of Steel Construction (AISC). The stress constraints obeying AISC-LRFD (American Institute of Steel Construction - Load and Resistance Factor Design), lateral displacement constraints being the top and inter-storey drift, mid-span deflection constraints for the beams and geometric constraints are considered for optimum design by using GA that mimics biological processes. Optimum designs for three different space frames taken from the literature are carried out first without considering concrete slab effects in finite element analyses for the constraints above and the results are compared with the ones available in literature. The same optimization procedures are then repeated for the case of space frames with composite (steel and concrete) beams. A program is coded in MATLAB for the optimization processes. Results obtained in the study showed that consideration of the contribution of the concrete on the behavior of the floor beams results with less steel weight and ends up with more economical designs.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.503
|
kci_detailed_000102.xml
|
||
ART002020582
|
oai_dc
|
Layout evaluation of building outrigger truss by using material topology optimization
|
Layout evaluation of building outrigger truss by using material topology optimization
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이동규(세종대학교); 신수미(부산대학교); 이재홍(세종대학교); 이기학(세종대학교)"
] |
This study presents conceptual information of newly optimized shapes and connectivity of the so-called outrigger truss system for modern tall buildings that resists lateral loads induced by wind and earthquake forces. In practice, the outrigger truss consists of triangular or Vierendeel types to stiffen tall buildings, and the decision of outrigger design has been qualitatively achieved by only engineers' experience and intuition, including information of structural behaviors, although outrigger shapes and the member's connectivity absolutely affect building stiffness, the input of material, construction ability and so on. Therefore the design of outrigger trusses needs to be measured and determined according to scientific proofs like reliable optimal design tools. In this study, at first the shape and connectivity of an outrigger truss system are visually evaluated by using a conceptual design tool of the classical topology optimization method, and then are quantitatively investigated with respect to a structural safety as stiffness, an economical aspect as material quantity, and construction characteristics as the number of member connection. Numerical applications are studied to verify the effectiveness of the proposed design process to generate a new shape and connectivity of the outrigger for both static and dynamic responses.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.263
|
kci_detailed_000102.xml
|
||
ART002020583
|
oai_dc
|
Hysteretic performance of SPSWs with trapezoidally horizontal corrugated web-plates
|
Hysteretic performance of SPSWs with trapezoidally horizontal corrugated web-plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hamed Kalali(University of Shahrood); Tadeh Zirakian(California State University); Mohammad Hajsadeghi(University of Liverpool); Farshid J. Alaee(University of Shahrood)"
] |
Previous research has shown that steel plate shear walls (SPSWs) are efficient lateral force-resisting systems against both wind and seismic loads. A properly designed SPSW can have high initial stiffness, strength, and energy absorption capacity as well as superior ductility. SPSWs have been commonly designed with unstiffened and stiffened infill plates based on economical and performance considerations. Recent introduction and application of corrugated plates with advantageous structural features has motivated the researchers to consider the employment of such elements in stiffened SPSWs with the aim of lowering the high construction cost of such high-performing systems. On this basis, this paper presents results from a numerical investigation of the hysteretic performance of SPSWs with trapezoidally corrugated infill plates. Finite element cyclic analyses are conducted on a series of flat- and corrugated-web SPSWs to examine the effects of web-plate thickness, corrugation angle, and number of corrugation half-waves on the hysteretic performance of such structural systems. Results of the parametric studies are indicative of effectiveness of increasing of the three aforementioned web-plate geometrical and corrugation parameters in improving the cyclic response and energy absorption capacity of SPSWs with trapezoidally corrugated infill plates. Increasing of the web-plate thickness and number of corrugation half-waves are found to be the most and the least effective in adjusting the hysteretic performance of such promising lateral force-resisting systems, respectively. Findings of this study also show that optimal selection of the web-plate thickness, corrugation angle, and number of corrugation half-waves along with proper design of the boundary frame members can result in high stiffness, strength, and cyclic performances of such corrugated-web SPSWs.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.277
|
kci_detailed_000102.xml
|
||
ART002020584
|
oai_dc
|
Analysis of behaviour for hollow/solid concrete-filled CHS steel beams
|
Analysis of behaviour for hollow/solid concrete-filled CHS steel beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Audronis Kazimieras Kvedaras(Vilnius Gediminas Technical University); Gintas Šaučiuvėnas(Vilnius Gediminas Technical University); Arūnas Komka(Vilnius Gediminas Technical University); Ela Jarmolajeva(Vilnius Gediminas Technical University)"
] |
Interaction between the external thin-walled steel tube and the internal concrete core significantly increases the bending resistance of composite beams and beam-columns in comparison with the steel or concrete members. There is presented a developed method for design of hollow and solid concrete-filled steel tubular beams based on test data, which gives better agreement with test results than EC4 because its limitation to take an increase in strength of concrete caused by confinement contradicts the recommendation of 6.7.2(4) that full composite action up to failure may be assumed between steel and concrete components of the member. Good agreement between the results of carried out experimental, numerical and theoretical investigations allows recommending the proposed method to use in design practice.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2015.19.2.293
|
kci_detailed_000102.xml
|
||
ART002075654
|
oai_dc
|
Test of extended thick-walled through-diaphragm connection to thick-walled CFT column
|
Test of extended thick-walled through-diaphragm connection to thick-walled CFT column
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ying Qin(Southeast University); Zhi-Hua Chen(Tianjin University); Jingjing Bai(Tianjin University); Zi-Lin Li(Tianjin Chengjian University)"
] |
The strength and stiffness of the steel beams to concrete-filled tubular columns connections are significantly reduced if the thick-walled components are used. However, the thick-walled tubes used for columns can largely reduce the demand for space and increase the strength-to-weight ratio. This paper describes the cyclic performance of extended through-diaphragm connections between steel beams and thick-walled concrete-filled tubular columns improved with fillets around the diaphragm corners. Test on one full-scale connection was conducted to assess the seismic behavior of the connection in terms of strength, stiffness, ductility, deformation, energy dissipation, and strain distribution. It is shown that the fillets and extended through-diaphragm can alleviate the stress concentration in the connection and thus improve the seismic performance. The test results demonstrate that the through-diaphragm connections with thick-walled concrete-filled tubular columns can offer sufficient energy dissipation capacity and ductility appropriate for its potential application in seismic design.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.1.001
|
kci_detailed_000102.xml
|
||
ART002075656
|
oai_dc
|
Experimental study of anisotropic behavior of PU foam used in sandwich panels
|
Experimental study of anisotropic behavior of PU foam used in sandwich panels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Monika Chuda-Kowalska(Poznan University of Technology); Andrzej Garstecki(Stanislaw Staszic University)"
] |
Polyurethane foam with low density used in sandwich panels is examined in the paper. A series of experiments was carried out to identify mechanical parameters of the foam. Various experimental methods were used for determining the shear modulus, namely a four and three point bending tests (the most common in engineering practice), a double-lap shear test and a torsion test. The behavior of PU in axial compression and tension was also studied. The experiments revealed pronounced anisotropy of the PU foam. An orthotropic model is proposed. Limitations of application of isotropic model of PU in engineering practice is also discussed.
|
토목공학
| null |
http://dx.doi.org/10.12989/scs.2016.20.1.043
|
kci_detailed_000102.xml
|
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