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ART002075524
|
oai_dc
|
Mechanical characterization of a self-compacting polymer concrete called isobeton
|
Mechanical characterization of a self-compacting polymer concrete called isobeton
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K. Boudjellal(LMGHU Laboratory); M. Bouabaz(LMGHU Laboratory); M. Belachia(LMGHU Laboratory)"
] |
This paper illustrates an experimental study on a self compacting polymer concrete called isobeton made of polyurethane foam and expanded clay. Several experiments were conducted to characterize the physic-mechanical properties of the considered material. Application of the Linear Elastic Fracture Mechanics (LEFM) and determining the toughness of two isobetons based on Belgian and Italian clay, was conducted to determine the stress intensity factor KIC and the rate of releasing energy GIC. The material considered was tested under static and dynamic loadings for two different samples with 10×10×40 and 10×15×40 cm dimensions. The result obtained by the application of the Linear Elastic Fracture Mechanics (LEFM) shows that is optimistic and fulfilled the physic-mechanical requirement of the study.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002132303
|
oai_dc
|
Thermal stresses in a non-homogeneous orthotropic infinite cylinder
|
Thermal stresses in a non-homogeneous orthotropic infinite cylinder
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"E. Edfawy(Assuit University)"
] |
The present paper is concerned with the investigation of propagation of thermoelastic media, the finite difference technique is used to obtain the solution for the uncoupled dynamic thermoelastic stress problem in a non-homogeneous orthrotropc thick cylindrical shell. In implementing the method, the linear dynamic thermoelasticity equations are used with the appropriate boundary and initial conditions. Thermal shock stress becomes of significant magnitude due to stress wave propagation which is initiated at the boundaries by sudden thermal loading. Numerical results have been given and illustrated graphically in each case considered. The presented results indicate that the effect of inhomogeneity is very pronounced.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002132300
|
oai_dc
|
Evaluation of a DDB design method for bridges isolated with triple pendulum bearings
|
Evaluation of a DDB design method for bridges isolated with triple pendulum bearings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gholamreza Ghodrati Amiri(Iran University of Science & Technology); Mahdi Mohammadian Shalmaee(University of Guilan); Pejman Namiranian(Iran University of Science and Technology)"
] |
In this study a direct displacement-based design (DDBD) procedure for a continuous deck bridge isolated with triple friction pendulum bearings (TFPB) has been proposed and the seismic demands of the bridge such as isolator\'s displacement and drift of piers obtained from this procedure evaluated under two-directional near-field ground motions. The structural model used here are continuous, three-span, castin-place concrete box girder bridge with a 30-degree skew which are isolated with 9 different TFPBs. By comparing the results of DDBD method with those of nonlinear time history analysis (NTHA), it can be concluded that the proposed procedure is able to predict seismic demands of similar isolated bridges with acceptable accuracy. Results of NTHA shows that dispersion of peak resultant responses for a group of ground motions increases by increasing their average value of responses. It needs to be noted that the demands parameters calculated by the DDBD procedure are almost overestimated for stiffer soil condition, but there is some underestimation in results of this method for softer soil condition.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002132311
|
oai_dc
|
Optimum design of steel floor system: effect of floor division number, deck thickness and castellated beams
|
Optimum design of steel floor system: effect of floor division number, deck thickness and castellated beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Kaveh(Iran University of Science and Technology); M.H. Ghafari(Iran University of Science and Technology)"
] |
Decks, interior beams, edge beams and girders are the parts of a steel floor system. If the deck is optimized without considering beam optimization, finding best result is simple. However, a deck with higher cost may increase the composite action of the beams and decrease the beam cost reducing the total cost. Also different number of floor divisions can improve the total floor cost. Increasing beam capacity by using castellated beams is other efficient method to save the costs. In this study, floor optimization is performed and these three issues are discussed. Floor division number and deck sections are some of the variables. Also for each beam, profile section of the beam, beam cutting depth, cutting angle, spacing between holes and number of filled holes at the ends of castellated beams are other variables. Constraints include the application of stress, stability, deflection and vibration limitations according to the load and resistance factor (LRFD) design. Objective function is the total cost of the floor consisting of the steel profile cost, cutting and welding cost, concrete cost, steel deck cost, shear stud cost and construction costs. Optimization is performed by enhanced colliding body optimization (ECBO), Results show that using castellated beams, selecting a deck with higher price and considering different number of floor divisions can decrease the total cost of the floor.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002132304
|
oai_dc
|
Reliability studies on RC beams exposed to fire based on IS456:2000 design methods
|
Reliability studies on RC beams exposed to fire based on IS456:2000 design methods
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Aneesha Balaji(National Institute of Technology); M.S. Aathira(National Institute of Technology); T.M. Madhavan Pillai(National Institute of Technology); Praveen Nagarajan(National Institute of Technology)"
] |
This paper examines a methodology for computing the probability of structural failure of reinforced concrete beams subjected to fire. The significant load variables considered are dead load, sustained live load and fire temperature. Resistance is expressed in terms of moment capacity with random variables taken as yield strength of steel, concrete class (or grade of concrete), beam width and depth. The flexural capacity is determined based on the design equations recommended in Indian standard IS456:2000. Simplified method named 500oC isotherm method detailed in Eurocode 2 is incorporated for fire design. A transient thermal analysis is conducted using finite element software ANSYS(R) Release15. Reliability is evaluated from the initial state to 4h of fire exposure based on the first order reliability method (FORM). A procedure is coded in MATLAB for finding the reliability index. This procedure is validated with available literature. The effect of various parameters like effective cover, yield strength of steel, grade of concrete, distribution of reinforcement bars and aggregate type on reliability indices are studied. Parameters like effective cover of concrete, yield strength of steel has a significant effect on reliability of beams. Different failure modes like limit state of flexure and limit state of shear are checked.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002132306
|
oai_dc
|
Influence of steel fiber and reinforcing details on the ultimate bearing strength of the post-tensioning anchorage zone
|
Influence of steel fiber and reinforcing details on the ultimate bearing strength of the post-tensioning anchorage zone
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jin-Kook Kim(POSCO); Jun-Mo Yang(POSCO); Yangsu Kwon(KHNP Central Research Institute)"
] |
In this paper, the effects of steel-fiber and rebar reinforcements on the ultimate bearing strength of the local anchorage zone were investigated based on experiments and comparisons between test results and design-equation predictions (AASHTO 2012, NCHRP 1994). Eighteen specimens were fabricated using the same anchorage device, which is one of the conventional anchorage devices, and two transverse ribs were used to secure an additional bearing area for a compact anchorage-zone design. Eight of the specimens were reinforced with only steel fiber and are of two concrete strengths, while six were reinforced with only rebars for two concrete strengths. The other four specimens were reinforced with both rebars and steel fiber for one concrete strength. The test and the comparisons between the design-equation predictions and the test results showed that the ultimate bearing strength and the section efficiency are highly affected by the reinforcement details and the concrete strength; moreover, the NCHRP equation can be conservatively applied to various local anchorage zones for the prediction of the ultimate bearing strength, whereby conditions such as the consideration of the rib area and the calibration factor are changed.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002132309
|
oai_dc
|
Strategy for refinement of nodal densities and integration cells in EFG technique
|
Strategy for refinement of nodal densities and integration cells in EFG technique
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bhavana S.S. Patel(National Institute of Technology Karnataka); Babu K.S. Narayan(National Institute of Technology Karnataka); Katta Venkataramana(National Institute of Technology Karnataka)"
] |
MeshFree methods have become popular owing to the ease with which high stress gradients can be identified and node density distribution can be reformulated to accomplish faster convergence. This paper presents a strategy for nodal density refinement with strain energy as basis in Element-Free Galerkin MeshFree technique. Two popular flat plate problems are considered for the demonstration of the proposed strategies. Issue of integration errors introduced during nodal density refinement have been addressed by suggesting integration cell refinement. High stress effects around two symmetrical semi-circular notches under in-plane axial load have been addressed in the first problem. The second considers crack propagation under mode I and mode II fracture loading by the way of introducing high stress intensity through line crack. The computational efficacy of the adaptive refinement strategies proposed has been highlighted.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002132308
|
oai_dc
|
Plastic energy approach prediction of fatigue crack growth
|
Plastic energy approach prediction of fatigue crack growth
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sofiane Maachou(University of Sidi-Bel-Abbes); Abdelkader Boulenouar(University of Sidi-Bel-Abbes); Mohamed Benguediab(University of Sidi-Bel-Abbes); Mohamed Mazari(University of Sidi-Bel-Abbes); Narayanaswami Ranganathan(School Polytechnic University of Tours)"
] |
The energy-based approach to predict the fatigue crack growth behavior under constant and variable amplitude loading (VAL) of the aluminum alloy 2024 T351 has been investigated and detailed analyses discussed. Firstly, the plastic strain energy was determined per cycle for different block load tests. The relationship between the crack advance and hysteretic energy dissipated per block can be represented by a power law. Then, an analytical model to estimate the lifetime for each spectrum is proposed. The results obtained are compared with the experimentally measured results and the models proposed by Klingbeil\'s model and Tracey\'s model. The evolution of the hysteretic energy dissipated per block is shown similar with that observed under constant amplitude loading.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002132301
|
oai_dc
|
Structural safety redundancy-based design method for structure with viscous dampers
|
Structural safety redundancy-based design method for structure with viscous dampers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Linfei Hao(Tongji University); Ruifu Zhang(Tongji University)"
] |
A simple design process is proposed for supplemental viscous dampers based on structural safety redundancy. In this process, the safety redundancy of the primary structure without a damper is assessed by the capacity and response spectra. The required damping ratio that should be provided by the supplemental dampers is estimated by taking the structural safety redundancy as a design target. The arrangement of dampers is determined according to the drift distribution obtained by performing pushover analysis. A benchmark model is used to illustrate and verify the validity of this design process. The results show that the structural safety redundancy of the structure provided by the viscous dampers increases to approximately twice that of the structure without a damper and is close to the design target. Compared with the existing design methods, the proposed process can estimate the elastic-plastic response of a structure more easily by using static calculation, and determine the required damping ratio more directly without iterative calculation or graphical process. It can be concluded that the proposed process is simple and effective.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002132310
|
oai_dc
|
Deflection of battened beams with shear and discrete effects
|
Deflection of battened beams with shear and discrete effects
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ji-liang Li(Ningbo University); Jian-kang Chen(Ningbo University)"
] |
This paper presents a theoretical analysis for determining the transverse deflection of simply supported battened beams subjected to a uniformly distributed transverse quasi-static load. The analysis considers not only the shear effect but also the discrete effect of battens on the transverse deflection of the battened beam. The analytical solution is obtained using the principle of minimum potential energy. Numerical validation of the present analytical solution is accomplished using finite element methods. The present analytical solution shows that the shear effect on the transverse deflection of battened beams increases with the cross-section area of the main member but decreases with the cross-section area of the batten. The longer the battened beam is, or the larger the moment of inertia of the main member is, the smaller the shear effect will be.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002132297
|
oai_dc
|
Impact of geometric pattern corrosion on limit failure pressure of buried gas pipelines
|
Impact of geometric pattern corrosion on limit failure pressure of buried gas pipelines
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nemat Hassani(Shahid Beheshti University); S. Mohammad S. Kolbadi(Shahid Beheshti University); Mahmud Reza Shiravand(Shahid Beheshti University); Jafar H. Golafshani(Shahid Beheshti University)"
] |
Gas pipelines are types of structures that are highly susceptible to corrosion. Sometimes, the pipes are subjected to a thinning of the wall thickness at the inside or outside wall due to erosion/corrosion. Therefore, it is important to evaluate the strength of the pipes undergoing corrosion to maintain the integrity of the piping systems. The main purpose of this study is to understand failure aspects caused by degradation of metal due to corrosion through. The ASME standard offers a relationship for the yielding pressure of the corroded pipes which was compared with the finite element results. The results demonstrate to obtain accurate results, the ASME relationship is unreliable. Moreover, pitting corrosion must be considered critical more than of other types.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002128884
|
oai_dc
|
Assessment of load carrying capacity and fatigue life expectancy of a monumental Masonry Arch Bridge by field load testing: a case study of veresk
|
Assessment of load carrying capacity and fatigue life expectancy of a monumental Masonry Arch Bridge by field load testing: a case study of veresk
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Amin Miri(Iran University of Science and Technology); Shervan Ataei(Iran University of Science and Technology); Mosab Tajalli(Iran University of Science and Technology)"
] |
Masonry arch bridges present a large segment of Iranian railway bridge stock. The ever increasing trend in traffic requires constant health monitoring of such structures to determine their load carrying capacity and life expectancy. In this respect, the performance of one of the oldest masonry arch bridges of Iranian railway network is assessed through field tests. Having a total of 11 sensors mounted on the bridge, dynamic tests are carried out on the bridge to study the response of bridge to test train, which is consist of two 6-axle locomotives and two 4-axle freight wagons. Finite element model of the bridge is developed and calibrated by comparing experimental and analytical mid-span deflection, and verified by comparing experimental and analytical natural frequencies. Analytical model is then used to assess the possibility of increasing the allowable axle load of the bridge to 25 tons. Fatigue life expectancy of the bridge is also assessed in permissible limit state. Results of F.E. model suggest an adequacy factor of 3.57 for an axle load of 25 tons. Remaining fatigue life of Veresk is also calculated and shown that a 0.2% decrease will be experienced, if the axle load is increased from 20 tons to 25 tons.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002128889
|
oai_dc
|
Dynamic response of curved Timoshenko beams resting on viscoelastic foundation
|
Dynamic response of curved Timoshenko beams resting on viscoelastic foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Faruk Fırat Calim(Adana Science and Technology University)"
] |
Curved beams’ dynamic behavior on viscoelastic foundation is the subject of the current paper. By rewritten the Timoshenko beams theory formulation for the curved and twisted spatial rods, governing equations are obtained for the circular beams on viscoelastic foundation. Using the complementary functions method (CFM), in Laplace domain, an ordinary differential equation is solved and then those results are transformed to real space by Durbin’s algorithm. Verification of the proposed method is illustrated by solving an example by variating foundation parameters.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002128887
|
oai_dc
|
Uncertainty effects of soil and structural properties on the buckling of flexible pipes shallowly buried in Winkler foundation
|
Uncertainty effects of soil and structural properties on the buckling of flexible pipes shallowly buried in Winkler foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Asma Khemis(University of BADJI Mokhtar - Annaba); Abdelmadjid Hacene Chaouche(university of BADJI Mokhtar - Annaba); Allaeddine Athmani(University of BADJI Mokhtar - Annaba); Kong Fah Tee(University of Greenwich)"
] |
The failure of civil engineering systems is a consequence of decision making under uncertain conditions. Generally, buried flexible pipes are designed for their transversal behavior to prevent from the important failure mode of buckling. However, the interaction effects between soil and pipe are neglected and the uncertainties in their properties are usually not considered in pipe design. In this regard, the present research paper evaluates the effects of these uncertainties on the uncertainty of the critical buckling hoop force of flexible pipes shallowly buried using the subgrade reaction theory (Winkler model) and First-Order Second-Moment (FOSM) method. The results show that the structural uncertainties of the studied pipes and those of the soil properties have a significant effect on the uncertainty of the critical buckling hoop force, and therefore taking into account these latter in the design of the shallowly flexible pipes for their buckling behavior is required.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002128879
|
oai_dc
|
Nonlinear vibration of conservative oscillator’s using analytical approaches
|
Nonlinear vibration of conservative oscillator’s using analytical approaches
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mahmoud Bayat(Islamic Azad University); Iman Pakar(Islamic Azad University); Mahdi Bayat(Islamic Azad University)"
] |
In this paper, a new analytical approach has been presented for solving nonlinear conservative oscillators. Variational approach leads us to high accurate solution with only one iteration. Two different high nonlinear examples are also presented to show the application and accuracy of the presented approach.
The results are compared with numerical solution using runge-kutta algorithm in different figures and tables.
It has been shown that the variatioanl approach doesn’t need any small perturbation and is accurate for nonlinear conservative equations.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002128891
|
oai_dc
|
Flexural performance of FRP-reinforced concrete encased steel composite beams
|
Flexural performance of FRP-reinforced concrete encased steel composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ilker Fatih Kara(Bursa Technical University)"
] |
This paper presents a numerical method for estimating the curvature, deflection and moment capacity of FRP-reinforced concrete encased steel composite beams (FRP-RCS). A sectional analysis is first carried out to predict the moment-curvature relationship from which beam deflection and moment capacity are then calculated. Comparisons between theoretical and experimental results of tests conducted elsewhere show that the proposed numerical technique can accurately predict moment capacity and deflection of FRPRCS composite beam. The numerical results also indicated that beam ductility and stiffness are improved when encased steel is added to FRP reinforced concrete beams. ACI, ISIS and Bischoff models for deflection prediction compared well at low load, however, significantly underestimated the experimental results for high load levels.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002128875
|
oai_dc
|
Economic performance of cable supported bridges
|
Economic performance of cable supported bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bin Sun(Tongji University); Li-wen Zhang(Tongji University); Yidong Qin(Tongji University); Ru-cheng Xiao(Tongji University)"
] |
A new cable-supported bridge model consisting of suspension parts, self-anchored cable-stayed parts and earth-anchored cable-stayed parts is presented. The new bridge model can be used for suspension bridges, cable-stayed bridges, cable-stayed suspension bridges, and partially earth-anchored cable-stayed bridges by varying parameters. Based on the assumption that each structural member is in either an axial compressive or tensile state, and the stress in each member is equal to the allowable stress of the material, the material quantity for each component is calculated. By introducing the unit cost of each type of material, the estimation formula for the cost of the new bridge model is developed. Numerical examples show that the results from the estimation formula agree well with that from the real projects. The span limit of cable supported bridge depends on the span-to-height ratio and the density-to-strength ratio of cables. Finally, a parametric study is illustrated aiming at the relations between three key geometrical parameters and the cost of the bridge model. The optimization of the new bridge model indicates that the self-anchored cable-stayed part is always the dominant part with the consideration of either the lowest total cost or the lowest unit cost. It is advisable to combine all three mentioned structural parts in super long span cable supported bridges to achieve the most excellent economic performance.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002128877
|
oai_dc
|
Influence of concurrent horizontal and vertical ground excitations on the collapse margins of non-ductile RC frame buildings
|
Influence of concurrent horizontal and vertical ground excitations on the collapse margins of non-ductile RC frame buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"T.Y. Yang(University of British Columbia); E. Noroozinejad Farsangi(International Institute of Earthquake Engineering and Seismology); A.A. Tasnimi(Tarbiat Modares University)"
] |
Recent earthquakes worldwide show that a significant portion of the earthquake shaking happens in the vertical direction. This phenomenon has raised significant interests to consider the vertical ground motion during the seismic design and assessment of the structures. Strong vertical ground motions can alter the axial forces in the columns, which might affect the shear capacity of reinforced concrete (RC) members. This is particularly important for non-ductile RC frames, which are very vulnerable to earthquake-induced collapse. This paper presents the detailed nonlinear dynamic analysis to quantify the collapse risk of nonductile RC frame structures with varying heights. An array of non-ductile RC frame architype buildings located in Los Angeles, California were designed according to the 1967 uniform building code. The seismic responses of the architype buildings subjected to concurrent horizontal and vertical ground motions were analyzed. A comprehensive array of ground motions was selected from the PEER NGA-WEST2 and Iran Strong Motions Network database. Detailed nonlinear dynamic analyses were performed to quantify the collapse fragility curves and collapse margin ratios (CMRs) of the architype buildings. The results show that the vertical ground motions have significant impact on both the local and global responses of non-ductile RC moment frames. Hence, it is crucial to include the combined vertical and horizontal shaking during the seismic design and assessment of non-ductile RC moment frames.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002128873
|
oai_dc
|
Dynamic visco-hyperelastic behavior of elastomeric hollow cylinder by developing a constitutive equation
|
Dynamic visco-hyperelastic behavior of elastomeric hollow cylinder by developing a constitutive equation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Masoud Asgari(K. N. Toosi University of Technology); Sanaz S. Hashemi(K. N. Toosi University of Technology)"
] |
In this study, developments of an efficient visco-hyperelastic constitutive equation for describing the time dependent material behavior accurately in dynamic and impact loading and finding related materials constants are considered. Based on proposed constitutive model, behaviour of a hollow cylinder elastomer bushing under different dynamic and impact loading conditions is studied. By implementing the developed visco-hyperelastic constitutive equation to LS-DYNA explicit dynamic finite element software a three dimensional model of the bushing is developed and dynamic behaviour of that in axial and torsional dynamic deformation modes are studied. Dynamic response and induced stress under different impact loadings which is rarely studied in previous researches have been also investigated. Effects of hyperelastic and visco-hyperelastic parameters on deformation and induced stresses as well as strain rate are considered.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002128881
|
oai_dc
|
A framework for carrying out train safety evaluation and vibration analysis of a trussed-arch bridge subjected to vessel collision
|
A framework for carrying out train safety evaluation and vibration analysis of a trussed-arch bridge subjected to vessel collision
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"He Xia(Beijing Jiaotong University); Chaoyi Xia(Beijing Jiaotong University); Nan Zhang(Beijing Jiaotong University); Qin Ma(CCCC Highway Consultants Co.); Xuan Wu(Beijing Jiaotong University)"
] |
Safety is the prime concern for a high-speed railway bridge, especially when it is subjected to a collision. In this paper, an analysis framework for the dynamic responses of train-bridge systems under collision load is established. A multi-body dynamics model is employed to represent the moving vehicle, the modal decomposition method is adopted to describe the bridge structure, and the time history of a collision load is used as the external load on the train-bridge system. A (180+216+180) m continuous steel trussedarch bridge is considered as an illustrative case study. With the vessel collision acting on the pier, the displacements and accelerations at the pier-top and the mid-span of the bridge are calculated when a CRH2 high-speed train running through the bridge, and the influence of bridge vibration on the running safety indices of the train, including derailment factors, offload factors and lateral wheel/rail forces, are analyzed. The results demonstrate that under the vessel collision load, the dynamic responses of the bridge are greatly enlarged, threatening the running safety of high-speed train on the bridge, which is affected by both the collision intensity and the train speed.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002128886
|
oai_dc
|
The effects of vertical earthquake motion on an R/C structure
|
The effects of vertical earthquake motion on an R/C structure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Selcuk Bas(Bartin University); Ilker Kalkan(Kirikkale University)"
] |
The present study investigated the earthquake behavior of R/C structures considering the vertical earthquake motion with the help of a comparative study. For this aim, the linear time-history analyses of a high-rise R/C structure designed according to TSC-2007 requirements were conducted including and excluding the vertical earthquake motion. Earthquake records used in the analyses were selected based on the ratio of vertical peak acceleration to horizontal peak acceleration (V/H). The frequency-domain analyses of the earthquake records were also performed to compare the dominant frequency of the records with that of the structure. Based on the results obtained from the time-history analyses under the earthquake loading with (H+V) and without the vertical earthquake motion (H), the value of the overturning moment and the top-story vertical displacement were found to relatively increase when considering the vertical earthquake motion. The base shear force was also affected by this motion; however, its increase was lower compared to the overturning moment and the top-story vertical displacement. The other two parameters, the top-story lateral displacement and the top-story rotation angle, barely changed under H and H+V loading cases. Modal damping ratios and their variations in horizontal and vertical directions were also estimated using response acceleration records. No significant change in the horizontal damping ratio was observed whereas the vertical modal damping ratio noticeably increased under H+V loading. The results obtained from this study indicate that the desired structural earthquake performance cannot be provided under H+V loading due to the excessive increase in the overturning moment, and that the vertical damping ratio should be estimated considering the vertical earthquake motion.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001895543
|
oai_dc
|
The effect of two temperatures on a FG nanobeam induced by a sinusoidal pulse heating
|
The effect of two temperatures on a FG nanobeam induced by a sinusoidal pulse heating
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ashraf M. Zenkour(King Abdulaziz University); Ahmed E. Abouelregal(Mansoura University)"
] |
The present investigation is concerned with the effect of two temperatures on functionally graded (FG) nanobeams subjected to sinusoidal pulse heating sources. Material properties of the nanobeam are assumed to be graded in the thickness direction according to a novel exponential distribution law in terms of the volume fractions of the metal and ceramic constituents. The upper surface of the FG nanobeam is fully ceramic whereas the lower surface is fully metal. The generalized two-temperature nonlocal theoryof thermoelasticity in the context of Lord and Shulman's (LS) model is used to solve this problem. The governing equations are solved in the Laplace transformation domain. The inversion of the Laplace transformation is computed numerically using a method based on Fourier series expansion technique. Somecomparisons have been shown to estimate the effects of the nonlocal parameter, the temperature discrepancy and the pulse width of the sinusoidal pulse. Additional results across the thickness of the nanobeam are presented graphically.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001895548
|
oai_dc
|
A practical neuro-fuzzy model for estimating modulus of elasticity of concrete
|
A practical neuro-fuzzy model for estimating modulus of elasticity of concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"İdris Bedirhanoglu(Dicle University)"
] |
The mechanical characteristics of materials are very essential in structural analysis for the accuracy of structural calculations. The estimation modulus of elasticity of concrete (Ec), one of the most important mechanical characteristics, is a very complex area in terms of analytical models. Many attempts have been made to model the modulus of elasticity through the use of experimental data. In this study, the neuro-fuzzy (NF) technique was investigated in estimating modulus of elasticity of concrete and a new simple NF model by implementing a different NF system approach was proposed. A large experimental database was used during the development stage. Then, NF model results were compared with various experimental data and results from several models available in related research literature. Several statistic measuring parameters were used to evaluate the performance of the NF model comparing to other models. Consequently, it has been observed that NF technique can be successfully used in estimating modulus of elasticity of concrete. It was also discovered that NF model results correlated strongly with experimental data and indicated more reliable outcomes in comparison to the other models.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001895547
|
oai_dc
|
Computational finite element model updating tool for modal testing of structures
|
Computational finite element model updating tool for modal testing of structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abdurrahman Şahin(Yıldız Technical University); Alemdar Bayraktar(Karadeniz Technical University)"
] |
In this paper, the development of a new optimization software for finite element model updating of engineering structures titled as FemUP is described. The program is used for computational FEM model updating of structures depending on modal testing results. This paper deals with the FE model updating procedure carried out in FemUP. The theoretical exposition on FE model updating and optimization techniques is presented. The related issues including the objective function, constraint function, different residuals and possible parameters for FE model updating are investigated. The issues of updating process adopted in FemUP are discussed. The ideas of optimization to be used in FE model updating application are explained. The algorithm of Sequential Quadratic Programming (SQP) is explored which will be used to solve the optimization problem. The possibilities of the program are demonstrated with athree dimensional steel frame model. As a result of this study, it can be said that SQP algorithm is very effective in model updating procedure.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001895554
|
oai_dc
|
A multi-crack effects analysis and crack identification in functionally graded beams using particle swarm optimization algorithm and artificial neural network
|
A multi-crack effects analysis and crack identification in functionally graded beams using particle swarm optimization algorithm and artificial neural network
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Hossein Abolbashari(Ferdowsi University of Mashhad); Foad Nazari(Ferdowsi University of Mashhad); Javad Soltani Rad(Amirkabir University of Technology)"
] |
In the first part of this paper, the influences of some of crack parameters on natural frequencies of a cracked cantilever Functionally Graded Beam (FGB) are studied. A cantilever beam is modeled using Finite Element Method (FEM) and its natural frequencies are obtained for different conditions of cracks. Then effect of variation of depth and location of cracks on natural frequencies of FGB with single and multiple cracks are investigated. In the second part, two Multi-Layer Feed Forward (MLFF) Artificial Neural Networks (ANNs) are designed for prediction of FGB's Cracks’ location and depth. Particle Swarm Optimization (PSO) and Back-Error Propagation (BEP) algorithms are applied for training ANNs. The accuracy of two training methods’ results are investigated.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001895556
|
oai_dc
|
Large deflection analysis of point supported super-elliptical plates
|
Large deflection analysis of point supported super-elliptical plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Murat Altekin(Yildiz Technical University)"
] |
Nonlinear bending of super-elliptical plates of uniform thickness under uniform transverse pressure was investigated by the Ritz method. The material was assumed to be homogeneous and isotropic.
The contribution of the boundary conditions at the point supports was introduced by the Lagrangemultipliers. The solution was obtained by the Newton-Raphson method. The influence of the location of the point supports on the central deflection was highlighted by sensitivity analysis. An approximate relationship between the central deflection and the super-elliptical power was obtained using the method of least squares.
The critical points where the maximum deflection may develop, and the influence of nonlinearity were highlighted. The nonlinearity was found to be sensitive to the aspect ratio. The accuracy of the algorithm was validated by comparing the central deflection with the solutions of elliptical and rectangular plates.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001895553
|
oai_dc
|
The effect of impact with adjacent structure on seismic behavior of base-isolated buildings with DCFP bearings
|
The effect of impact with adjacent structure on seismic behavior of base-isolated buildings with DCFP bearings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Morteza Bagheri(Amirkabir University of Technology); Faramarz Khoshnoudian(Amirkabir University of Technology)"
] |
Since the isolation bearings undergo large displacements in base-isolated structures, impact with adjacent structures is inevitable. Therefore, in this investigation, the effect of impact on seismicresponse of isolated structures mounted on double concave friction pendulum (DCFP) bearings subjected to near field ground motions is considered. A non-linear viscoelastic model of collision is used to simulate structural pounding more accurately. 2-, 4- and 8-story base-isolated buildings adjacent to fixed-base structures are modeled and the coupled differential equations of motion related to these isolated systems are solved in the MATLAB environment using the SIMULINK toolbox. The variation of seismic responses such as base shear, displacement in the isolation system and superstructure (top floor) is computed to study the impact condition. Also, the effects of variation of system parameters: isolation period, superstructure period, size of seismic gap between two structures, radius of curvature of the sliding surface and frictioncoefficient of isolator are contemplated in this study. It is concluded that the normalized base shear, bearing and top floor displacement increase due to impact with adjacent structure. When the distance between two structures decreases, the base shear and displacement increase comparing to no impact condition. Besides, the increase in friction coefficient difference also causes the normalized base shear and displacement in isolation system and superstructure increase in comparison with bi-linear hysteretic behavior of base isolation system. Totally, the comparison of results indicates that the changes in values of friction coefficient have more significant effects on 2-story building than 4- and 8-story buildings.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001895545
|
oai_dc
|
Performance of partial strength connection connected by thick plate between column flanges
|
Performance of partial strength connection connected by thick plate between column flanges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mahmood M. Tahir(Universiti Teknologi Malaysia); Irwan Juki(Universiti Tun Hussein Onn); Mohd Y. Ishak(Universiti Teknologi Malaysia); Shahrin Mohammad(Universiti Teknologi Malaysia); Abdullah Z. Awang(Universiti Teknologi Malaysia); Roger Plank(University of Sheffield)"
] |
Traditional beam connections to the minor axis of a column have relatively low strength and stiffness. A modified detail, using a plate welded between the toes of the column flange - referred to as a toe plate connection - is examined in this paper. The results of an experimental investigation for both flush and extended end-plate connections connected to a 25 mm thick end-plate are presented. The tests are complemented by finite element modelling which compares very well with the test observations. The results show a significant increase in both moment resistance and initial stiffness for this connection detail compared with connections made directly to the column web. This offers the prospect of more optimal solutions taking advantage of partial strength frame design for the minor axis as well as major axis.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001895551
|
oai_dc
|
Soil-pile interaction effects in wharf structures under lateral loads
|
Soil-pile interaction effects in wharf structures under lateral loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bilge Doran(Yıldız Technical University); Aytuğ Seçkin(Yıldız Technical University)"
] |
Wharfs are essential to shipping and support very large gravity loads on both a short-term and long-term basis which cause quite large seismic internal forces. Therefore, these structures are vulnerable to seismic activities. As they are supported on vertical and/or batter piles, soil-pile interaction effects under earthquake events have a great importance in seismic resistance which is not yet fully understood. Seismic design codes have become more stringent and suggest the use of new design methods, such as Performance Based Design principles. According to Turkish Code for Coastal and Port Structures (TCCS 2008), theinteraction between soil and pile should somehow be considered in the nonlinear analysis in an accurate manner. This study aims to explore the lateral load carrying capacity of recently designed wharf structures considering soil-pile interaction effects for different soil conditions. For this purpose, nonlinear structure analysis according to TCCS (2008) has been performed comparing simplified and detailed modeling results.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001895555
|
oai_dc
|
Vibration of vehicle-bridge coupling system with measured correlated road surface roughness
|
Vibration of vehicle-bridge coupling system with measured correlated road surface roughness
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wanshui Han(Chang’an University); Sujing Yuan(Southeast University); Lin Ma(Hohai University)"
] |
The present study investigated the effect of the correlation of the measured road roughness profiles corresponding to the left and right wheels of a vehicle on the vibration of a vehicle-bridge couplingsystem. Four sets of road roughness profiles were measured by a laser road-testing vehicle. A correlationanalysis was carried out on the four roughness samples, and two samples with the strongest correlation andweakest correlation were selected for the power spectral density, autocorrelation and cross-correlation analyses. The scenario of a three-axle truck moving across a rigid-frame arch bridge was used as an example. The two selected road roughness profiles were used as inputs to the vehicle-bridge coupling system. Three different input modes were adopted in the numerical analysis: (1) using the measured road roughness profile of the left wheel for the input of both wheels in the numerical simulation; (2) using the measured road roughness profile of the right wheel for both wheels; and (3) using the measured roadroughness profiles corresponding to left and right wheels for the input corresponding to the vehicle‟s left and right wheels, respectively. The influence of the three input modes on the vibration of the vehicle-bridge system was analyzed and compared in detail. The results show that the correlation of the road roughness profiles corresponding to left and right wheels and the selected roughness input mode both have a significant influence on the vibration of the vehicle-bridge coupling system.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001895557
|
oai_dc
|
Accurate analytical solutions for nonlinear oscillators with discontinuous
|
Accurate analytical solutions for nonlinear oscillators with discontinuous
|
{
"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 study, three approximate analytical methods have been proposed to prepare an accurate analytical solution for nonlinear oscillators with fractional potential. The basic idea of the approaches and their applications to nonlinear discontinuous equations have been completely presented and discussed. Some patterns are also presented to show the accuracy of the methods. Comparisons between Energy Balance Method (EBM) , Variational Iteration Method (VIM) and Hamiltonian Approach (HA) shows that the proposed approaches are very close together and could be easily extend to conservative nonlinear vibrations.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001992050
|
oai_dc
|
A n-order refined theory for bending and free vibration of functionally graded beams
|
A n-order refined theory for bending and free vibration of functionally graded beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lazreg Hadji(Université Ibn Khaldoun); T. Hassaine Daouadji(Université Ibn Khaldoun); A. Tounsi(Université de Sidi Bel Abbes); E.A. Bedia(Université de Sidi Bel Abbes)"
] |
In this paper, a simple n-order refined theory based on neutral surface position is developed for bending and frees vibration analyses of functionally graded beams. 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 |
kci_detailed_000070.xml
|
|||
ART001992067
|
oai_dc
|
A new block assembly method for shipbuilding at sea
|
A new block assembly method for shipbuilding at sea
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bilin Zhang(Hyundai Heavy Industries (Shanghai) R & D Co., Ltd); 부승환(한국과학기술원); 김진균(한국기계연구원)"
] |
In this paper, we introduce a new method for assembly of shipbuilding blocks at sea and present its feasibility focusing on structural safety. The core concept of this method is to assemble ship building blocks by use of bolting, gluing and welding techniques at sea without dock facilities. Due to its independence of dock facilities, shipyard construction capability could be increased considerably by the proposed method. To show the structural safety of this method, a bulk carrier and an oil tanker were employed, and we investigated the structural behavior of those ships to which the new block assembly method was applied. The ship hull models attached with connective parts are analyzed in detail through finite element analyses, and the cargo capacity of the bulk carrier is briefly discussed as well. The results of these studies show the potential for applying this new block assembly method to practical shipbuilding.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001992075
|
oai_dc
|
Random vibration analysis of train-slab track-bridge coupling system under earthquakes
|
Random vibration analysis of train-slab track-bridge coupling system under earthquakes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhi-ping Zeng(Central South University); Xian-feng He(Central South University); Yan-gang Zhao(Central South University); Zhi-wu Yu(Central South University); Ling-kun Chen(Central South University); Wen-tao Xu(Central South University); Ping Lou(Central South University)"
] |
This study aimed to investigate the random vibration characteristic of train-slab track-bridge interaction system subjected to both track irregularities and earthquakes by use of pseudo-excitation method (PEM). Each vehicle subsystem was modeled by multibody dynamics. A three-dimensional rail-slabgirder-pier finite element model was created to simulate slab track and bridge subsystem. The equations of motion for the entire system were established based on the constraint condition of no jump between wheel and rail. The random load vectors of equations of motion were formulated by transforming track irregularities and seismic accelerations into a series of deterministic pseudo-excitations according to their respective power spectral density (PSD) functions by means of PEM. The time-dependent PSDs of random vibration responses of the system were obtained by step-by-step integration method, and the corresponding extreme values were estimated based on the first-passage failure criterion. As a case study, an ICE3 high-speed train passing a fifteen-span simply supported girder bridge simultaneously excited by track irregularities and earthquakes is presented. The evaluated extreme values and the PSD characteristic of the random vibration responses of bridge and train are analyzed, and the influences of train speed and track irregularities (without earthquakes) on the random vibration characteristic of bridge and train are discussed.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001992036
|
oai_dc
|
Effect of pile group geometry on bearing capacity of piled raft foundations
|
Effect of pile group geometry on bearing capacity of piled raft foundations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammed Y. Fattah(University of Technology); Mustafa A. Yousif(Al-Mustansiriya University); Sarmad M.K. Al-Tameemi(Al-Mustansiriya University)"
] |
This is an experimental study to investigate the behaviour of piled raft system in different types of sandy soil. A small scale “prototype” model was tested in a sand box with load applied to the foundation through a compression jack and measured by means of load cell. The settlement was measured at the raft by means of dial gauges, three strain gauges were attached on piles to measure the strains and calculate the load carried by each pile in the group. Nine configurations of group (1×2, 1×3, 1×4, 2×2, 2×3, 2×4, 3×3, 3×4 and 4×4) were tested in the laboratory as a free standing pile group (the raft not in contact with the soil) and as a piled raft (the raft in contact with the soil), in addition to tests for raft (unpiled) with different sizes.
It is found that when the number of piles within the group is small (less than 4), there is no evident contribution of the raft to the load carrying capacity. The failure load for a piled raft consisting of 9 piles is approximately 100% greater than free standing pile group containing the same number of piles. This difference increases to about 4 times for 16 pile group. The piles work as settlement reducers effectively when the number of piles is greater than 6 than when the number of piles is less than 6. The settlement can be increased by about 8 times in (1×2) free standing pile group compared to the piled raft of the same size.
The effect of piled raft in reducing the settlement vanishes when the number of piles exceeds 6.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001992037
|
oai_dc
|
Nonlinear large deflection buckling analysis of compression rod with different moduli
|
Nonlinear large deflection buckling analysis of compression rod with different moduli
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wenjuan Yao(Shanghai University); Jianwei Ma(Shanghai University); Jinling Gao(Shanghai University); Yuanzhong Qiu(SEGOC)"
] |
Many novel materials exhibit a property of different elastic moduli in tension and compression.
One such material is graphene, a wonder material, which has the highest strength yet measured.
Investigations on buckling problems for structures with different moduli are scarce. To address this new problem, firstly, the nondimensional expression of the relation between offset of neutral axis and deflection curve is derived based on the phased integration method, and then using the energy method, load-deflection relation of the rod is determined; Secondly, based on the improved constitutive model for different moduli, large deformation finite element formulations are developed and combined with the arc-length method, finite element iterative program for rods with different moduli is established to obtain buckling critical loads; Thirdly, material mechanical properties tests of graphite, which is the raw material of graphene, are performed to measure the tensile and compressive elastic moduli, moreover, buckling tests are also conducted to investigate the buckling behavior of this kind of graphite rod. By comparing the calculation results of the energy method and finite element method with those of laboratory tests, the analytical model and finite element numerical model are demonstrated to be accurate and reliable. The results show that it may lead to unsafe results if the classic theory was still adopted to determine the buckling loads of those rods composed of a material having different moduli. The proposed models could provide a novel approach for further investigation of non-linear mechanical behavior for other structures with different moduli.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001992041
|
oai_dc
|
Buckling analysis of functionally graded material grid systems
|
Buckling analysis of functionally graded material grid systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K. Darılmaz(İstanbul Technical University); M. Gunhan Aksoylu(İstanbul Technical University); Yavuz Durgun(İstanbul Technical University)"
] |
This paper aims to fill the technical gap on the elastic buckling behavior of functionally graded material (FGM) grid systems under inplane loads on which few research has been done. Material properties of an FG beam are assumed to vary smoothly in the thickness direction according to power and exponential laws. Based on a hybrid-stress finite element formulation, buckling solutions for FGM grid systems consisting of various aspect ratios and material gradation are provided. The numerical results demonstrate that the aspect ratio and material gradation play an important role in the buckling behavior of FGM grid systems. We believe that the new results obtained from this study, will be very useful to designers and researchers in this field.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001992057
|
oai_dc
|
Biaxial creep property of ethylene tetrafluoroethylene (ETFE) foil
|
Biaxial creep property of ethylene tetrafluoroethylene (ETFE) foil
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yintang Li(Tongji University); Minger Wu(Tongji University)"
] |
Ethylene tetrafluoroethylene (ETFE) foil is a novel structural material which has being used in shell and spatial structures. This paper studies biaxial creep property of ETFE foil by creep tests and numerical simulation. Biaxial creep tests of cruciform specimens were performed using three stress ratios, 1:1, 2:1 and 1:2, which showed that creep coefficients in biaxial tension were much smaller than those in uniaxial one. Then, a reduction factor was introduced to take account of this biaxial effect, and relation between the reduction factor and stress ratio was established. Circular bubble creep test and triangle cushion creep test of ETFE foil were performed to verify the relation. Interpolation was adopted to consider creep stress and reduction factor was involved to take account of biaxial effect in numerical simulation. Simulation results of the bubble creep test embraced a good agreement with those measuring ones. In triangle cushion creep test, creep displacements from numerical simulation showed a good agreement with those from creep test at the center and lower foil measuring points.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001992043
|
oai_dc
|
Wind-induced vibration characteristics and parametric analysis of large hyperbolic cooling towers with different feature sizes
|
Wind-induced vibration characteristics and parametric analysis of large hyperbolic cooling towers with different feature sizes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shitang Ke(Nanjing University of Aeronautics and Astronautics); Yaojun Ge(Tongji University); Lin Zhao(Tongji University); Yukio Tamura(Tokyo Polytechnic University)"
] |
For a systematic study on wind-induced vibration characteristics of large hyperbolic cooling towers with different feature sizes, the pressure measurement tests are finished on the rigid body models of three representative cooling towers with the height of 155 m, 177 m and 215 m respectively. Combining the refined frequency-domain algorithm of wind-induced responses, the wind-induced average response, resonant response, background response, coupling response and wind vibration coefficients of large cooling towers with different feature sizes are obtained. Based on the calculating results, the parametric analysis on wind-induced vibration of cooling towers is carried out, e.g. the feature sizes, damping ratio and the interference effect of surrounding buildings. The discussion shows that the increase of feature sizes makes wind-induced average response and fluctuating response larger correspondingly, and the proportion of resonant response also gradually increased, but it has little effect on the wind vibration coefficient. The increase of damping ratio makes resonant response and the wind vibration coefficient decreases obviously, which brings about no effect on average response and background response. The interference effect of surrounding buildings makes the fluctuating response and wind vibration coefficient increased significantly, furthermore, the increase ranges of resonant response is greater than background response.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001992054
|
oai_dc
|
Influence of polled direction on the stress distribution in piezoelectric materials
|
Influence of polled direction on the stress distribution in piezoelectric materials
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nihat İlhan(Yildiz Technical University); Nagihan Koç(Yildiz Technical University)"
] |
In this paper, the influence of the polled direction of piezoelectric materials on the stress distribution is studied under time-harmonic dynamical load (time-harmonic Lamb’s problem). The system considered in this study consists of piezoelectric covering layer and piezoelectric half-plane, and the harmonic dynamical load acts on the free face of the covering layer. The investigations are carried out by utilizing the exact equations of motion and relations of the linear theory of electro-elasticity. The plane-strain state is considered. It is assumed that the perfect contact conditions between the covering layer and halfplane are satisfied. The boundary value problems under consideration are solved by employing Fourier exponential transformation techniques with respect to coordinates directed along the interface line.
Numerical results on the influence of the polled direction of the piezoelectric materials such as PZT-5A, PZT-5H, PZT-4 and PZT-7A on the normal stresses, shear stresses and electric potential acting on the interface plane are presented and discussed. As a result of the analyses, it is established that the polled directions of the piezoelectric materials play an important role on the values of the studied stresses and electric potential.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001992046
|
oai_dc
|
Numerical and experimental study on dynamic response of moored spar-type scale platform for floating offshore wind turbine
|
Numerical and experimental study on dynamic response of moored spar-type scale platform for floating offshore wind turbine
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"E.Y. Choi(부산대학교); 조진래(부산대학교); Y.U. Cho(부산대학교); 정의봉(부산대학교); 이시복(부산대학교); 홍신표(부산대학교); 전호환(부산대학교)"
] |
The dynamic response and the mooring line tension of a 1/75 scale model of spar-type platform for 2.5 MW floating offshore wind turbine subject to one-dimensional regular harmonic wave are investigated numerically and verified by experiment. The upper part of wind turbine which is composed of three rotor blades, hub and nacelle is modeled as a lumped mass the scale model and three mooring lines are pre-tensioned by means of linear springs. The coupled fluid-rigid body interaction is numerically simulated by a coupled FEM-cable dynamics code, while the experiment is performed in a wave tank with the specially-designed vision and data acquisition system. The time responses of surge, heave and pitch motions of the scale platform and the mooring line tensions are obtained numerically and the frequency domainconverted RAOs are compared with the experiment.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001992064
|
oai_dc
|
An analytical study on the nonlinear vibration of a doublewalled carbon nanotube
|
An analytical study on the nonlinear vibration of a doublewalled carbon nanotube
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali Hajnayeb(Shahid Chamran University of Ahvaz); S.E. Khadem(Tarbiat Modares University)"
] |
In this paper, free vibrations of a clamped-clamped double-walled carbon nanotube (DWNT) under axial force is studied. By utilizing Euler–Bernoulli beam theory, each layer of DWNT is modeled as a beam. In this analysis, nonlinear form of interlayer van der Waals (vdW) forces and nonlinearities aroused from mid-plane stretching are also considered in the equations of motion. Further, direct application of multiple scales perturbation method is utilized to solve the obtained equations and to analyze free vibrations of the DWNT. Therefore, analytical expressions are found for vibrations of each layer. Linear and nonlinear natural frequencies of the system and vibration amplitude ratios of inner to outer layers are also obtained.
Finally, the results are compared with the results obtained by Galerkin method.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART001992052
|
oai_dc
|
Walking load model for single footfall trace in three dimensions based on gait experiment
|
Walking load model for single footfall trace in three dimensions based on gait experiment
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yixin Peng(Tongji University); Jun Chen(Tongji University); Guo Ding(Tongji University)"
] |
This paper investigates the load model for single footfall trace of human walking. A large amount of single person walking load tests were conducted using the three-dimensional gait analysis system.
Based on the experimental data, Fourier series functions were adopted to model single footfall trace in three directions, i.e. along walking direction, direction perpendicular to the walking path and vertical direction.
Function parameters such as trace duration time, number of Fourier series orders, dynamic load factors (DLFs) and phase angles were determined from the experimental records. Stochastic models were then suggested by treating walking rates, duration time and DLFs as independent random variables, whose probability density functions were obtained from experimental data. Simulation procedures using the stochastic models are presented with examples. The simulated single footfall traces are similar to the experimental records.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002145307
|
oai_dc
|
Girder distribution factors for steel bridges subjected to permit truck or super load
|
Girder distribution factors for steel bridges subjected to permit truck or super load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sami W. Tabsh(American University of Sharjah); Muna M. Mitchell(Walter P Moore)"
] |
There are constraints on truck weight, axle configurations and size imposed by departments of transportation around the globe due to structural capacity limitations of highway pavements and bridges. In spite of that, freight movers demand some vehicles that surpass the maximum size and legal weight limits to use the transportation network. Oversized trucks serve the purpose of spreading the load on the bridge; thus, reducing the load effect on the superstructure. For such vehicles, often a quick structural analysis of the existing bridges along the traveled route is needed to ensure that the structural capacity is not exceeded. For a wide vehicle having wheel gage larger than the standard 1830 mm, the girder distribution factors in the design specifications cannot be directly used to estimate the live load in the supporting girders. In this study, a simple approach that is based on finite element analysis is developed by modifying the AASHTO LRFD’s girder distribution factors for slab-on-steel-girder bridges to overcome this problem. The proposed factors allow for determining the oversized vehicle bending moment and shear force effect in the individual girders as a function of the gage width characteristics. Findings of the study showed that the relationship between the girder distribution factor and gage width is more nonlinear in shear than in flexure. The proposed factors yield reasonable results compared with the finite element analysis with adequate level of conservatism.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002145302
|
oai_dc
|
Moving load response on the stresses produced in an irregular microstretch substrate
|
Moving load response on the stresses produced in an irregular microstretch substrate
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tanupreet Kaur(Thapar University); Satish Kumar Sharma(Thapar University); Abhishek Kumar Singh(Indian School of Mines); Mriganka Shekhar Chaki(Indian School of Mines)"
] |
The present article is aimed at an investigation of stresses produced in a microstretch elastic halfspace due to a moving load. The expressions of normal stress, shear stress and tangential couple stress produced in this case have been obtained in closed form. To find the displacement fields the perturbation method is applied. Significant effect of moving load on variation of stresses developed at different depths below the surface due to the depth of substrate and frictional coefficient of the rough surface of the medium has been observed. The effects of different shapes of irregularity and depth of irregularity on normal, shear and tangential couple stresses have been discussed. Some particular cases have also been deduced from the present investigation. Finally, the analytical developments have been illustrated numerically for aluminiumepoxy- like material substrate under the action of moving load.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002145305
|
oai_dc
|
Polypropylene fiber reinforced concrete plates under fluid impact. Part II: modeling and simulation
|
Polypropylene fiber reinforced concrete plates under fluid impact. Part II: modeling and simulation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hasan Korucu(1Turkish Armed Forces Headquarters)"
] |
Fluid impact tests on plates containing mesh reinforcement and polypropylene fibers were modeled and simulated using explicit finite element analysis software, LS-DYNA. The scabbing dimensions obtained by the experiments and the simulations were compared and crack formations were matched. The objective was to test the accuracy and fidelity of the model and to confirm that damage caused by fluid impact on the plates can be estimated with a reasonable accuracy over a wide range of impact velocity.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002145304
|
oai_dc
|
Polypropylene fiber reinforced concrete plates under fluid impact. Part I: experiments
|
Polypropylene fiber reinforced concrete plates under fluid impact. Part I: experiments
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hasan Korucu(1Turkish Armed Forces Headquarters)"
] |
Static loading and fluid impact tests on plates containing mesh reinforcement and polypropylene fibers in ratios of 0 to 3% by volume were performed. The objective was to observe the effect of fluid mass on the total impulse that caused the impact event and the influence of fiber amount on the impact resistance, and to estimate the velocity of fluid that causes scabbing, perforation or total disintegration. The study is the first to express the fluid impact resistance of polypropylene fiber reinforced concrete plates.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002145308
|
oai_dc
|
Experimental and numerical study on innovative seismic T-Resisting Frame (TRF)
|
Experimental and numerical study on innovative seismic T-Resisting Frame (TRF)
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Payam Ashtari(University of Zanjan); Helia Barzegar Sedigh(Imam Khomeini International University); Farzaneh Hamedi(Imam Khomeini International University)"
] |
In common structural systems, there are some limitations to provide adequate lateral stiffness, high ductility, and architectural openings simultaneously. Consequently, the concept of T-Resisting Frame (TRF) has been introduced to improve the performance of structures. In this study, Configuration of TRF is a Vertical I-shaped Plate Girder (V.P.G) which is placed in the middle of the span and connected to side columns by two Horizontal Plate Girders (H.P.Gs) at each story level. System performance is improved by utilizing rigid connections in link beams (H.P.Gs). Plastic deformation leads to tension field action in H.P.Gs and causes energy dissipation in TRF; therefore, V.P.G. High plastic deformation in web of TRF’s members affects the ductility of system. Moreover, in order to prevent shear buckling in web of TRF’s members and improve overall performance of the system, appropriate criteria for placement of web stiffeners are presented in this study. In addition, an experimental study is conducted by applying cyclic loading and using finite element models. As a result, hysteresis curves indicate adequate lateral stiffness, stable hysteretic behavior, and high ductility factor of 6.73.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002145309
|
oai_dc
|
Investigation of buckling behavior of functionally graded piezoelectric (FGP) rectangular plates under open and closed circuit conditions
|
Investigation of buckling behavior of functionally graded piezoelectric (FGP) rectangular plates under open and closed circuit conditions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.A. Ghasemabadian(Ferdowsi University of Mashhad); M. Kadkhodayan(Ferdowsi University of Mashhad)"
] |
In this article, based on the higher-order shear deformation plate theory, buckling analysis of a rectangular plate made of functionally graded piezoelectric materials and its effective parameters are investigated. Assuming the transverse distribution of electric potential to be a combination of a parabolic and a linear function of thickness coordinate, the equilibrium equations for the buckling analysis of an FGP rectangular plate are established. In addition to the Maxwell equation, all boundary conditions including the conditions on the top and bottom surfaces of the plate for closed and open circuited are satisfied.
Considering double sine solution (Navier solution) for displacement field and electric potential, an analytical solution is obtained for full simply supported boundary conditions. The accurate buckling load of FGP plate is presented for both open and closed circuit conditions. It is found that the critical buckling load for open circuit is more than that of closed circuit in all loading conditions. Furthermore, it is observed that the influence of dielectric constants on the critical buckling load is more than those of others.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002145311
|
oai_dc
|
Time-dependent bond transfer length under pure tension in one way slabs
|
Time-dependent bond transfer length under pure tension in one way slabs
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Behnam Vakhshouri(University of Technology Sydney (UTS))"
] |
In a concrete member under pure tension, the stress in concrete is uniformly distributed over the whole concrete section. It is supposed that a local bond failure occurs at each crack, and there is a relative slip between steel and surrounding concrete. The compatibility of deformation between the concrete and reinforcement is thus not maintained. The bond transfer length is a length of reinforcement adjacent to the crack where the compatibility of strain between the steel and concrete is not maintained because of partially bond breakdown and slip. It is an empirical measure of the bond characteristics of the reinforcement, incorporating bar diameter and surface characteristics such as texture. Based on results from a series of previously conducted long-term tests on eight restrained reinforced concrete slab specimens and material properties including creep and shrinkage of two concrete batches, the ratio of final bond transfer length after all shrinkage cracking, to THE initial bond transfer length is presented.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002145313
|
oai_dc
|
On thermal stability of plates with functionally graded coefficient of thermal expansion
|
On thermal stability of plates with functionally graded coefficient of thermal expansion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abdelmoumen Anis Bousahla(Centre Universitaire de Relizane); Samir Benyoucef(Université de Sidi Bel Abbés); Abdelouahed Tounsi(Université de Sidi Bel Abbés); S.R. Mahmoud(King Abdulaziz University)"
] |
In this article, a four-variable refined plate theory is presented for buckling analysis of functionally graded plates subjected to uniform, linear and non-linear temperature rises across the thickness direction. The theory accounts for parabolic distribution of the transverse shear strains, and satisfies the zero traction boundary conditions on the surfaces of the plate without using shear correction factor. Young’s modulus and Poisson ratio of the FGM plates are assumed to remain constant throughout the entire plate. However, the coefficient of thermal expansion of the FGM plate varies according to a power law form through the thickness coordinate. Equilibrium and stability equations are derived based on the present theory. The influences of many plate parameters on buckling temperature difference such ratio of thermal expansion, aspect ratio, side-to-thickness ratio and gradient index will be investigated.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002145303
|
oai_dc
|
Experimental study on wave forces to offshore support structures
|
Experimental study on wave forces to offshore support structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Youn-Ju Jeong(Korea Institute of Civil Engineering and Building Technology); Min-Su Park(Korea Institute of Civil Engineering and Building Technology); Young-Jun You(Korea Institute of Civil Engineering and Building Technology)"
] |
In this study, wave force tests were carried out for the four types of offshore support structures with scale factor 1:25 and wave forces to the support structure shapes were investigated. As the results of this study, it was found that, as the wave period increased at the normal wave condition, wave force decreased for the most cases. Extreme wave force was affected by the impact wave force. Impact wave force of this study significantly effect on Monopile and slightly on GBS and Hybrid type. Accordingly, Hybrid type indicated even lower wave force at the extreme and irregular wave conditions than the Monopile although Hybrid type indicated higher wave force at the normal wave condition of the regular wave because of the larger wave area of wave body. In respects of the structural design, since critical loading is extreme wave force, it should be contributed to improve structural safety of offshore support structure. However, since the impact wave force has nonlinearity and complication dependent on the support structure shape, wave height, wave period, and etc., more research is needed to access the impact wave force for other support structure shapes and wave conditions.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002145317
|
oai_dc
|
Deformation of a rectangular plate with an arbitrarily located circular hole under in-plane pure shear loading
|
Deformation of a rectangular plate with an arbitrarily located circular hole under in-plane pure shear loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yeong-Bin Yang(National Taiwan University); Jae-Hoon Kang(Chung-Ang University)"
] |
Exact solutions for stresses, strains, displacements, and the stress concentration factors of a rectangular plate perforated by an arbitrarily located circular hole subjected to in-plane pure shear loading are investigated by two-dimensional theory of elasticity using the Airy stress function. The hoop stresses, strains, and displacements occurring at the edge of the circular hole are computed and plotted. Comparisons are made for the hoop stresses and the stress concentration factors from the present study and those from a rectangular plate with a circular hole under uni-axial and bi-axial uniform tensions and in-plane pure bending moments on two opposite edges.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002145314
|
oai_dc
|
Assessment of steel components and reinforced concrete structures under steam explosion conditions
|
Assessment of steel components and reinforced concrete structures under steam explosion conditions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김승현(경희대학교); 장윤석(경희대학교); 조용진(한국원자력안전기술원)"
] |
Even though extensive researches have been performed for steam explosion due to their complex mechanisms and inherent uncertainties, establishment of severe accident management guidelines and strategies is one of state-of-the arts in nuclear industry. The goal of this research is primarily to examine effects of vessel failure modes and locations on nuclear facilities under typical steam explosion conditions. Both discrete and integrated models were employed from the viewpoint of structural integrity assessment of steel components and evaluation of the cracking and crushing in reinforced concrete structures. Thereafter, comparison of systematic analysis results was performed; despite the vessel failure modes were dominant, resulting maximum stresses at the all steel components were sufficiently lower than the corresponding yield strengths. Two failure criteria for the reinforced concrete structures such as the limiting failure ratio of concrete and the limiting strains for rebar and liner plate were satisfied under steam explosion conditions. Moreover, stresses of steel components and reinforced concrete structures were reduced with maximum difference of 12% when the integrated model was adopted comparing to those of discrete models.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002046621
|
oai_dc
|
Intermediate crack-induced debonding analysis for RC beams strengthened with FRP plates
|
Intermediate crack-induced debonding analysis for RC beams strengthened with FRP plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Peelak Wantanasiri(Chulalongkorn University); Akhrawat Lenwari(Chulalongkorn University)"
] |
This paper presents the analysis of intermediate crack-induced (IC) debonding failure loads for reinforced concrete (RC) beams strengthened with adhesively-bonded fiber-reinforced polymer (FRP) plates or sheets. The analysis consists of the energy release and simple ACI methods. In the energy release method, a fracture criterion is employed to predict the debonding loads. The interfacial fracture energy that indicates the resistance to debonding is related to the bond-slip relationships obtained from the shear test of FRP-toconcrete bonded joints. The section analysis that considers the effect of concrete‟s tension stiffening is employed to develop the moment-curvature relationships of the FRP-strengthened sections. In the ACI method, the onset of debonding is assumed when the FRP strain reaches the debonding strain limit. The tension stiffening effect is neglected in developing a moment-curvature relationship. For a comparison purpose, both methods are used to numerically investigate the effects of relevant parameters on the IC debonding failure loads. The results show that the debonding failure load generally increases as the concrete compressive strength, FRP reinforcement ratio, FRP elastic modulus and steel reinforcement ratio increase.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002046616
|
oai_dc
|
High-order, closely-spaced modal parameter estimation using wavelet analysis
|
High-order, closely-spaced modal parameter estimation using wavelet analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Thai-Hoa Le(Northeastern University); Luca Caracoglia(Northeastern University)"
] |
This study examines the wavelet transform for output-only system identification of ambient excited engineering structures with emphasis on its utilization for modal parameter estimation of high-order and closely-spaced modes. Sophisticated time-frequency resolution analysis has been carried out by employing the modified complex Morlet wavelet function for better adaption and flexibility of the timefrequency resolution to extract two closely-spaced frequencies. Furthermore, bandwidth refinement techniques such as a bandwidth resolution adaptation, a broadband filtering technique and a narrowband filtering one have been proposed in the study for the special treatments of high-order and closely-spaced modal parameter estimation. Ambient responses of a 5-story steel frame building have been used in the numerical example, using the proposed bandwidth refinement techniques, for estimating the modal parameters of the high-order and closely-spaced modes. The first five natural frequencies and damping ratios of the structure have been estimated; furthermore, the comparison among the various proposed bandwidth refinement techniques has also been examined.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002046619
|
oai_dc
|
Brief and accurate analytical approximations to nonlinear static response of curled cantilever micro beams
|
Brief and accurate analytical approximations to nonlinear static response of curled cantilever micro beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Youhong Sun(Jilin University); Yongping Yu(Jilin University); Baochang Liu(Jilin University)"
] |
In this paper, the nonlinear static response of curled cantilever beam actuators subjected to the one-sided electrostatic field is focused on. By assuming the deflection function of electrostatically actuated beam, analytical approximate solutions are established via using Galerkin method to solve the equilibrium equation. The Pull-In voltages which determine the stability of the curled beam actuators are also obtained.
These approximate solutions show excellent agreements with numerical solutions obtained by the shooting method and the experimental data for a wide range of beam length. Expressions of these analytical approximate solutions are brief and could easily be used to derive the effects of various physical parameters on MEMS structures.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002046613
|
oai_dc
|
Springback FE modeling of titanium alloy tubes bending using various hardening models
|
Springback FE modeling of titanium alloy tubes bending using various hardening models
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehdi Shahabi(Shiraz University); Ali Nayebi(Shiraz University)"
] |
In this study, effect of various material hardening models based on Holloman’s isotropic, Ziegler’s linear kinematic, non-linear kinematic and mixture of the isotropic and nonlinear kinematic hardening laws on springback prediction of titanium alloy (Ti-3Al-2.5V) in a tube rotary draw bending (RDB) process was investigated with presenting the keynotes for a comprehensive step by step ABAQUS simulation. Influence of mandrel on quality of the final product including springback, wall-thinning and cross-section deformation of the tube was investigated, too. Material parameters of the hardening models were obtained based on information of a uniaxial test. In particular, in the case of combined iso-nonlinear kinematic hardening the material constants were calibrated by a simple approach based on half-cycle data instead of several stabilized cycles ones. Moreover, effect of some material and geometrical parameters on springback was carried out. The results showed that using the various hardening laws separately cannot describe the material hardening behavior correctly. Therefore, it is concluded that combining the hardening laws is a good idea to have accurate springback prediction. Totally the results are useful for predicting and controlling springback and cross-section deformation in metal forming processes.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002046622
|
oai_dc
|
Generalized Rayleigh wave propagation in a covered half-space with liquid upper layer
|
Generalized Rayleigh wave propagation in a covered half-space with liquid upper layer
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Masoud Negin(Istanbul Technical University)"
] |
Propagation of the generalized Rayleigh waves in an initially stressed elastic half-space covered by an elastic layer is investigated. It is assumed that the initial stresses are caused by the uniformly distributed normal compressional forces acting on the face surface of the covering layer. Two different cases where the compressional forces are “dead” and “follower” forces are considered. Three-dimensional linearized theory of elastic waves in initially stressed bodies in plane-strain state is employed and the elasticity relations of the materials of the constituents are described through the Murnaghan potential where the influence of the third order elastic constants is taken into consideration. The dispersion equation is derived and an algorithm is developed for numerical solution to this equation. Numerical results for the dispersion of the generalized Rayleigh waves on the influence of the initial stresses and on the influence of the character of the external compressional forces are presented and discussed. These investigations provide some theoretical foundations for study of the near-surface waves propagating in layered mechanical systems with a liquid upper layer, study of the structure of the soil of the bottom of the oceans or of the seas and study of the behavior of seismic surface waves propagating under the bottom of the oceans.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002046614
|
oai_dc
|
Structural system simulation and control via NN based fuzzy model
|
Structural system simulation and control via NN based fuzzy model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Pei-Wei Tsai(Fujain University of Technology); T. Hayat(Quaid-I-Azam University); B. Ahmad(King Abdulaziz University); Cheng-Wu Chen(National Kaohsiung Marine University)"
] |
This paper deals with the problem of the global stabilization for a class of tension leg platform (TLP) nonlinear control systems. It is well known that, in general, the global asymptotic stability of the TLP subsystems does not imply the global asymptotic stability of the composite closed-loop system. Finding system parameters for stabilizing the control system is also an issue need to be concerned. In this paper, we give additional sufficient conditions for the global stabilization of a TLP nonlinear system. In particular, we consider a class of NN based Takagi-Sugeno (TS) fuzzy TLP systems. Using the so-called parallel distributed compensation (PDC) controller, we prove that this class of systems can be globally asymptotically stable. The proper design of system parameters are found by a swarm intelligence algorithm called Evolved Bat Algorithm (EBA). An illustrative example is given to show the applicability of the main result.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002046615
|
oai_dc
|
Multi-swarm fruit fly optimization algorithm for structural damage identification
|
Multi-swarm fruit fly optimization algorithm for structural damage identification
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Li(Sun Yat-sen University); Z. R. Lu(Sun Yat-sen University)"
] |
In this paper, the Multi-Swarm Fruit Fly Optimization Algorithm (MFOA) is presented for structural damage identification using the first several natural frequencies and mode shapes. We assume damage only leads to the decrease of element stiffness. The differences on natural frequencies and mode shapes of damaged and intact state of a structure are used to establish the objective function, which transforms a damage identification problem into an optimization problem. The effectiveness and accuracy of MFOA are demonstrated by three different structures. Numerical results show that the MFOA has a better capacity for structural damage identification than the original Fruit Fly Optimization Algorithm (FOA) does.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002046618
|
oai_dc
|
Behavior of wall panels in industrial buildings caused by differential settlements
|
Behavior of wall panels in industrial buildings caused by differential settlements
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Suyai Fernández(National University of Comahue); Rossana C. Jaca(National University of Comahue); Luis A. Godoy(National University of Córdoba)"
] |
This paper presents the analysis of mechanical behavior of metal wall panels of storehouses and industrial buildings subjected to differential settlements. The storehouses considered are representative of those used in the agricultural activity. A small-scale model was built and tested in order to have evidence of the behavior and to validate computational models. The numerical investigation is carried out through finite element analysis using a general-purpose software, by modeling buildings with different geometries and evaluating different settlements of the ground. To obtain an adequate model, geometric non-linearity has to be taken into account. Models that represent the most usual geometric typologies were investigated under support settlements. The deflected shape of the wall panel and the relationship between the horizontal displacements and the settlement of the foundations are evaluated. The results show that there are large outof- plane displacements caused by settlements that would be admitted by design recommendations.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002046610
|
oai_dc
|
Disturbance due to internal heat source in thermoelastic solid using dual phase lag model
|
Disturbance due to internal heat source in thermoelastic solid using dual phase lag model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Praveen Ailawalia(MM University); Amit Singla(IK Gujral Punjab Technical University)"
] |
The dual-phase lag heat transfer model is employed to study the problem of isotropic generalized thermoelastic medium with internal heat source. The normal mode analysis is used to obtain the exact expressions for displacement components, force stress and temperature distribution. The variations of the considered variables through the horizontal distance are illustrated graphically. The results are discussed and depicted graphically.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002046611
|
oai_dc
|
Bolted joints for single-layer structures: numerical analysis of the bending behaviour
|
Bolted joints for single-layer structures: numerical analysis of the bending behaviour
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Lopez- Arancibia(Tecnun (University of Navarra)); A.M. Altuna-Zugasti(Tecnun (University of Navarra)); H. Aizpurua Aldasoro(Technische Universität Carolo-Wilhelmina Braunschw); A. Pradera-Mallabiabarrena(Tecnun (University of Navarra))"
] |
This paper deals with a new designed joint system for single-layer spatial structures. As the stability of these structures is greatly influenced by the joint behaviour, the aim of this paper is the characterization of the joint response in bending through Finite Element Method (FEM) analysis using ABAQUS. The behaviour of the joints studied here was influenced by many geometrical factors, such as bolts and plate sizes, distance between bolts and end-plate thickness. The study comprised five models of joints with different values of those parameters. The numerical results were compared to the results of previous experimental tests and the agreement was good enough. The differences between the numerical and experimental initial stiffness are attributed to the simplifications introduced when modelling the bolt threads as well as the presence of residual stresses in the test specimens.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002040968
|
oai_dc
|
Evaluating the spread plasticity model of IDARC for inelastic analysis of reinforced concrete frames
|
Evaluating the spread plasticity model of IDARC for inelastic analysis of reinforced concrete frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehdi Izadpanah(Department of Civil Engineering, University of Kurdistan); AliReza Habibi(Department of Civil Engineering, University of Kurdistan)"
] |
There are two types of nonlinear analysis methods for building frameworks depending on the method of modeling the plastification of members including lumped plasticity and distributed plasticity. The lumped plasticity method assumes that plasticity is concentrated at a zero-length plastic hinge section at the ends of the elements. The distributed plasticity method discretizes the structural members into many line segments, and further subdivides the cross-section of each segment into a number of finite elements. When a reinforced concrete member experiences inelastic deformations, cracks tend to spread form the joint interface resulting in a curvature distribution. The program IDARC includes a spread plasticity formulation to capture the variation of the section flexibility, and combine them to determine the element stiffness matrix. In this formulation, the flexibility distribution in the structural elements is assumed to be the linear.
The main objective of this study is to evaluate the accuracy of linear flexibility distribution assumed in the spread inelasticity model. For this purpose, nonlinear analysis of two reinforced concrete frames is carried out and the linear flexibility models used in the elements are compared with the real ones. It is shown that the linear flexibility distribution is incorrect assumption in cases of significant gravity load effects and can be lead to incorrect nonlinear responses in some situations.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002040970
|
oai_dc
|
A fuzzy residual strength based fatigue life prediction method
|
A fuzzy residual strength based fatigue life prediction method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yi Zhang(School of Civil & Environmental Engineering, Nanyang Technological University)"
] |
The fatigue damage problems are frequently encountered in the design of civil engineering structures. A realistic and accurate fatigue life prediction is quite essential to ensure the safety of engineering design. However, constructing a reliable fatigue life prediction model can be quite challenging. The use of traditional deterministic approach in predicting the fatigue life is sometimes too dangerous in the real practical designs as the method itself contains a wide range of uncertain factors. In this paper, a new fatigue life prediction method is going to be proposed where the residual strength is been utilized. Several cumulative damage models, capable of predicting the fatigue life of a structural element, are considered. Based on Miner's rule, a randomized approach is developed from a deterministic equation. The residual strength is used in a one to one transformation methodology which is used for the derivation of the fatigue life. To arrive at more robust results, fuzzy sets are introduced to model the parameter uncertainties. This leads to a convoluted fuzzy based fatigue life prediction model. The developed model is illustrated in an example analysis. The calculated results are compared with real experimental data. The applicability of this approach for a required reliability level is also discussed.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002040967
|
oai_dc
|
Effects of mixed contents of carbon nanoreinforcements on the impact resistance of epoxy-based nanocomposites
|
Effects of mixed contents of carbon nanoreinforcements on the impact resistance of epoxy-based nanocomposites
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.R. Ayatollahi(Iran University of Science and Technology); A.R. Naeemi(Iran University of Science and Technology); E. Alishahi(Iran University of Science and Technology)"
] |
The impact behavior of epoxy-based nanocomposites reinforced with carbon nano tube (CNT), carbon nano fiber (CNF) and mixed contents of these nanoparticles was investigated using Izod impact test.
The results showed that while the impact strength of nanocomposites containing 1 wt% of CNT and 1 wt% of CNF increased 19% and 13% respectively, addition of mixed contents of these nanofillers (0.5-0.5 wt%) demonstrated higher improvement (21%) in the impact resistance. The trend of the results is explained on the basis of different fracture mechanisms of nanocomposites. Furthermore, the fracture surface of specimens and the dispersion state of nanoenhancers have been studied using scanning electron microscopy (SEM) photographs.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002040972
|
oai_dc
|
Theoretical analysis of simply supported channel girder bridges
|
Theoretical analysis of simply supported channel girder bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hong-Song Hu(Disaster Prevention Research Institute (DPRI), Kyoto University); Jian-Guo Nie(Department of Civil Engineering, Tsinghua University); Yu-Hang Wang(School of Civil Engineering, Chongqing University)"
] |
Channel girder bridges that consist of a deck slab and two side beams are good choices for railway bridges and urban rail transit bridges when the vertical clearance beneath the bridge is restricted. In this study, the behavior of simply supported channel girder bridges was theoretical studied based on the theory of elasticity. The accuracy of the theoretical solutions was verified by the finite element analysis. The global bending of the channel girder and the local bending of the deck slab are two contributors to the deformations and stresses of the channel girder. Because of the shear lag effect, the maximum deflection due to the global bending could be amplified by 1.0 to 1.2 times, and the effective width of the deck slab for determining the global bending stresses can be as small as 0.7 of the actual width depending on the width-tospan ratio of the channel girder. The maximum deflection and transversal stress due to the local bending are obtained at the girder ends. For the channel girders with open section side beams, the side beam twist has a negligible effect on the deflections and stresses of the channel girder. Simplified equations were also developed for calculating the maximum deformations and stresses.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002040969
|
oai_dc
|
Experimental and numerical investigation of walls strengthened with fiber plaster
|
Experimental and numerical investigation of walls strengthened with fiber plaster
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hakan Basaran(Department of Civil Engineering, Celal Bayar University); Ali Demir(Department of Civil Engineering, Celal Bayar University); Muhiddin Bagcı(Department of Civil Engineering, Celal Bayar University); Sefa Ergun(Department of Civil Engineering, Celal Bayar University)"
] |
The topic of this study is to investigate behaviors of masonry walls strengthened with reinforced fiber plaster under diagonal tensile loads. Full blend brick 100×50×30 mm in dimensions were used to make masonry walls with dimensions of 400×400×100 mm. Three different samples were manufactured by plastering masonry walls with traditional style, with 3% polypropylene or with 5% steel fiber. All the samples were tested using ASTM 1391- 81 standards. The propagation of damage on samples caused by diagonal tensile load was observed and load-displacement graphs were plotted for each sample. A finite element software (ABAQUS) was used to obtain numerical values for all samples and crack patterns and load-displacement responses were obtained. Experimental and numerical results were compared.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002040975
|
oai_dc
|
Influence of wind disturbance on smart stiffness identification of building structure using limited micro-tremor observation
|
Influence of wind disturbance on smart stiffness identification of building structure using limited micro-tremor observation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ryuji Koyama(Department of Architecture and Architectural Engineering, Kyoto University); Kohei Fujita(Department of Architecture and Architectural Engineering, Kyoto University); Izuru Takewaki(Department of Architecture and Architectural Engineering, Kyoto University)"
] |
While most of researches on system identification of building structures are aimed at finding modal parameters first and identifying the corresponding physical parameters by using the transformation in terms of transfer functions and cross spectra, etc., direct physical parameter system identification methods have been proposed recently. Due to the problem of signal/noise (SN) ratios, the previous methods are restricted mostly to earthquake records or forced vibration data. In this paper, a theoretical investigation is performed on the influence of wind disturbances on stiffness identification of building structures using micro-tremor at limited floors. It is concluded that the influence of wind disturbances on stiffness identification of building structures using micro-tremor at limited floors is restricted in case of using time-series data for low-rise buildings and does not cause serious problems.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002040976
|
oai_dc
|
Minimum shear reinforcement ratio of prestressed concrete members for safe design
|
Minimum shear reinforcement ratio of prestressed concrete members for safe design
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"박민국(서울대학교); 이득행(서울시립대학교); 주현진(서울대학교); 황진하(서울대학교); 최승호(서울대학교); 김강수(서울시립대학교)"
] |
Design codes have specified the minimum shear reinforcement requirement for reinforced concrete (RC) and prestressed concrete (PSC) members to prevent brittle and premature shear failure. They are, however, very different from one another, and particularly, ACI318 code allows the required minimum shear reinforcement to be reduced in PSC members, compared to that in RC members, by specifying the additional equation for PSC members whose basis is not clear. In this paper, the minimum shear reinforcement ratio for PSC members was proposed, which can provide a sufficient reserved shear strength and deformation capacity. The proposed equation was also verified by the test results of PSC specimens lightly reinforced in shear, comparing to design codes and other proposed equations from previous studies.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002040973
|
oai_dc
|
Correlation between chloride-induced corrosion initiation and time to cover cracking in RC Structures
|
Correlation between chloride-induced corrosion initiation and time to cover cracking in RC Structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Seyed Abbas Hosseini(University of Sistan and Baluchestan); Naser Shabakhty(University of Sistan and Baluchestan); Seyed Saeed Mahini(The University of New England)"
] |
Numerical value of correlation between effective parameters in the strength of a structure is as important as its stochastic properties in determining the safety of the structure. In this article investigation is made about the variation of coefficient of correlation between effective parameters in corrosion initiation time of reinforcement and the time of concrete cover cracking in reinforced concrete (RC) structures. Presence of many parameters and also error in measurement of these parameters results in uncertainty in determination of corrosion initiation and the time to crack initiation. In this paper, assuming diffusion process as chloride ingress mechanism in RC structures and considering random properties of effective parameters in this model, correlation between input parameters and predicted time to corrosion is calculated using the Monte Carlo (MC) random sampling. Results show the linear correlation between corrosion initiation time and effective input parameters increases with increasing uncertainty in the input parameters. Diffusion coefficient, concrete cover, surface chloride concentration and threshold chloride concentration have the highest correlation coefficient respectively. Also the uncertainty in the concrete cover has the greatest impact on the coefficient of correlation of corrosion initiation time and the time of crack initiation due to the corrosion phenomenon
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002040971
|
oai_dc
|
A nonlocal quasi-3D trigonometric plate model for free vibration behaviour of micro/nanoscale plates
|
A nonlocal quasi-3D trigonometric plate model for free vibration behaviour of micro/nanoscale plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Aicha Bessaim(Université de Sidi Bel Abbes); Mohammed Sid Ahmed Houan(Université de Sidi Bel Abbes); Fabrice Bernard(Université Européenne de Bretagne); Abdelouahed Tounsi(Université de Sidi Bel Abbes)"
] |
In this work, a nonlocal quasi-3D trigonometric plate theory for micro/nanoscale plates is proposed. In order to introduce the size influences, the Eringen’s nonlocal elasticity theory is utilized. In addition, the theory considers both shear deformation and thickness stretching effects by a trigonometric variation of all displacements within the thickness, and respects the stress-free boundary conditions on the top and bottom surfaces of the plate without considering the shear correction factor.
The advantage of this theory is that, in addition to considering the small scale and thickness stretching effects (εz≠0), the displacement field is modelled with only 5 unknowns as the first order shear deformation theory (FSDT). Analytical solutions for vibration of simply supported micro/nanoscale plates are illustrated, and the computed results are compared with the available solutions in the literature and finite element model using ABAQUS software package. The influences of the nonlocal parameter, shear deformation and thickness stretching on the vibration behaviors of the micro/nanoscale plates are examined.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002040974
|
oai_dc
|
Investigation of bond-slip modeling methods used in FE analysis of RC members
|
Investigation of bond-slip modeling methods used in FE analysis of RC members
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Serhat Demir(Department of Civil Engineering, Karadeniz Technical University); Metin Husem(Department of Civil Engineering, Karadeniz Technical University)"
] |
Adherence between reinforcement and the surrounding concrete is usually ignored in finite element analysis (FEA) of reinforced concrete (RC) members. However, load transition between the reinforcement and surrounding concrete effects RC members’ behavior a great deal. In this study, the effects of bond-slip on the FEA of RC members are examined. In the analyses, three types of bond-slip modeling methods (perfect bond, contact elements and spring elements) and three types of reinforcement modeling methods (smeared, one dimensional line and three dimensional solid elements) were used. Bond-slip behavior between the reinforcement and surrounding concrete was simulated with cohesive zone materials (CZM) for the first time. The bond-slip relationship was identified experimentally using a beam bending test as suggested by RILEM. The results obtained from FEA were compared with the results of four RC beams that were tested experimentally. Results showed that, in FE analyses, because of the perfect bond occurrence between the reinforcement and surrounding concrete, unrealistic strains occurred in the longitudinal reinforcement. This situation greatly affected the load deflection relationship because the longitudinal reinforcements dominated the failure mode. In addition to the spring elements, the combination of a bonded contact option with CZM also gave closer results to the experimental models. However, modeling of the bond-slip relationship with a contact element was quite difficult and time consuming. Therefore bond-slip modeling is more suitable with spring elements.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002134022
|
oai_dc
|
Diagonal bracing of steel frames with multi-cable arrangements
|
Diagonal bracing of steel frames with multi-cable arrangements
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Metin Husem(Karadeniz Technical University); Serhat Demir(Karadeniz Technical University); Hong G. Park(Seoul National University); Suleyman I. Cosgun(Karadeniz Technical University)"
] |
A large number of structure in the world were build with poor seismic details, with or without any lateral load resisting system like concentrically braced frames and steel plate shear walls. These structures can reveal deteriorating hysteretic behaviors with stiffness and strength degradation. Therefore, seismic retrofitting of such structures for drift control has vital importance. In this study a retrofit methodology has been developed, which involves diagonal bracing of steel frames with different cable arrangements. In the experimental and numerical program 5 different lateral load resisting system were tested and results compared with each other. The results indicated that multi-cable arrangements suggested in this study showed stable ductile behavior without any sudden decrease in strength. Due to the usage of more than one diagonal cable, fracture of any cable did not significantly affect the overall strength and deformation capacity of the system. In cable braced systems damages concentrated in the boundary zones of the cables and beams. That is why boundary zone must have enough stiffness and strength to resist tension field action of cables.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002133999
|
oai_dc
|
Dispersion of shear wave in a pre-stressed hetrogeneous orthotropic layer over a pre-stressed anisotropic porous half-space with self-weight
|
Dispersion of shear wave in a pre-stressed hetrogeneous orthotropic layer over a pre-stressed anisotropic porous half-space with self-weight
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rajneesh Kakar(163, Phase-1, Chotti Baradari Garah Road); Shikha Kakar(SBBS University)"
] |
The purpose of this study is to illustrate the propagation of the shear waves (SH-waves) in a prestressed hetrogeneous orthotropic media overlying a pre-stressed anisotropic porous half-space with self weight. It is considered that the compressive initial stress, mass density and moduli of rigidity of the upper layer are space dependent. The proposed model is solved to obtain the different dispersion relations for the SH-wave in the elastic-porous medium of different properties. The effects of compressive and tensile stresses along with the heterogeneity, porosity, Biot‟s gravity parameter on the dispersion of SH-wave are shown numerically. The wave analysis further indicates that the technical parameters of upper and lower half-space affect the wave velocity significantly. The results may be useful to understand the nature of seismic wave propagation in geophysical applications and in the field of earthquake and material science engineering.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002134000
|
oai_dc
|
Displacement and force control of complex element structures by Matrix Condensation
|
Displacement and force control of complex element structures by Matrix Condensation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Najmadeen M. Saeed (University of Raparin); Alan S.K. Kwan(Cardiff University)"
] |
A direct and relatively simple method for controlling nodal displacements and/or internal bar forces has been developed for prestressable structural assemblies including complex elements (“macroelements”, e.g., the pantographic element), involving Matrix Condensation, in which structural matrices being built up from matrices of elementary elements. The method is aimed at static shape control of geometrically sensitive structures. The paper discusses identification of the most effective bars for actuation, without incurring violation in bar forces, and also with objective of minimal number of actuators or minimum actuation. The advantages of the method is that the changes for both force and displacement regimes are within a single formulation. The method can also be used for adjustment of bar forces to either reduce instances of high forces or increase low forces (e.g., in a cable nearing slack).
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002134007
|
oai_dc
|
A dynamic foundation model for the analysis of plates on foundation to a moving oscillator
|
A dynamic foundation model for the analysis of plates on foundation to a moving oscillator
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Phuoc T. Nguyen(Ho Chi Minh City Open University); Trung D. Pham(Quang Trung University); Hoa P. Hoang(The University of Danang)"
] |
This paper proposes a new foundation model called “Dynamic foundation model” for the dynamic analysis of plates on foundation subjected to a moving oscillator. This model includes a linear elastic spring, shear layer, viscous damping and the special effects of mass density parameters of foundation during vibration. By using finite element method and the principle of dynamic balance, the governing equation of motion of the plate travelled by the oscillator is derived and solved by the Newmark‟s time integration procedure. The accuracy of the algorithm is verified by comparing the numerical results with the other numerical results in the literature. Also, the effects of mass and damping ratio of system components, stiffness of suspension system, velocity of moving oscillator, and dynamic foundation parameters on dynamic responses are investigated. A very important role of these factors will be shown in the dynamic behavior of the plate.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002134021
|
oai_dc
|
Structural behavior of cable-stayed bridges after cable failure
|
Structural behavior of cable-stayed bridges after cable failure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Seungjun Kim(Daejeon University); Young Jong Kang(Korea University)"
] |
This paper investigates the change of structural characteristics of steel cable-stayed bridges after cable failure. Cables, considered as the intermediate supports of cable-stayed bridges, can break or fail for several reasons, such as fire, direct vehicle clash accident, extreme weather conditions, and fatigue of cable or anchorage. Also, the replacement of cables can cause temporary disconnection. Because of the structural characteristics with various geometric nonlinearities of cable-stayed bridges, cable failure may cause significant change to the structural state and ultimate behavior. Until now, the characteristics of structural behavior after cable failure have rarely been studied. In this study, rational cable failure analysis is suggested to trace the new equilibrium with structural configuration after the cable failure. Also, the sequence of ultimate analysis for the structure that suffers cable failure is suggested, to study the change of ultimate behavior and load carrying capacity under specific live load conditions. Using these analysis methods, the statical behavior after individual cable failure is studied based on the change of structural configuration, and distribution of internal forces. Also, the change of the ultimate behavior and load carrying capacity under specific live load conditions is investigated, using the proposed analysis method. According to the study, significant change of the statical behavior and ultimate capacity occurs although just one cable fails.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002134018
|
oai_dc
|
Free vibration and buckling analysis of the impacted hybrid composite beams
|
Free vibration and buckling analysis of the impacted hybrid composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Emin Ergun(Pamukkale University); Yasin Yilmaz (Pamukkale University); Hasan Çallioğlu(Pamukkale University)"
] |
The aim of this experimental study is to investigate the free vibration and buckling behaviors of hybrid composite beams having different span lengths and orientation angles subjected to different impact energy levels. The impact energies are applied in range from 10 J to 30 J. Free vibration and buckling behaviors of intact and impacted hybrid composite beams are compared with each other for different span lengths, orientation angles and impact levels. In free vibration analysis, the first three modes of hybrid beams are considered and natural frequencies are normalized. It is seen that first and second modes are mostly affected with increasing impact energy level. Also, the fundamental natural frequency is mostly affected with the usage of mold that have 40 mm span length (SP40). Moreover, as the impact energy increases, the normalized critical buckling loads decrease gradually for 0
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002134019
|
oai_dc
|
Problem-dependent cubic linked interpolation for Mindlin plate four-node quadrilateral finite elements
|
Problem-dependent cubic linked interpolation for Mindlin plate four-node quadrilateral finite elements
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Dragan Ribarić(University of Rijeka)"
] |
We employ the so-called problem-dependent linked interpolation concept to develop two cubic 4-node quadrilateral plate finite elements with 12 external degrees of freedom that pass the constant bending patch test for arbitrary node positions of which the second element has five additional internal degrees of freedom to get polynomial completeness of the cubic form. The new elements are compared to the existing linked-interpolation quadratic and nine-node cubic elements presented by the author earlier and to the other elements from literature that use the cubic linked interpolation by testing them on several benchmark examples.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002134016
|
oai_dc
|
Structural identification based on incomplete measurements with iterative Kalman filter
|
Structural identification based on incomplete measurements with iterative Kalman filter
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yong Ding(Harbin Institute of Technology); Lina Guo(Southeast University)"
] |
Structural parameter evaluation and external force estimation are two important parts of structural health monitoring. But the structural parameter identification with limited input information is still a challenging problem. A new simultaneous identification method in time domain is proposed in this study to identify the structural parameters and evaluate the external force. Each sampling point in the time history of external force is taken as the unknowns in force evaluation. To reduce the number of unknowns for force evaluation the time domain measurements are divided into several windows. In each time window the structural excitation is decomposed by orthogonal polynomials. The time-variant excitation can be represented approximately by the linear combination of these orthogonal bases. Structural parameters and the coefficients of decomposition are added to the state variable to be identified. The extended Kalman filter (EKF) is augmented and selected as the mathematical tool for the implementation of state variable evaluation. The proposed method is validated numerically with simulation studies of a time-invariant linear structure, a hysteretic nonlinear structure and a time-variant linear shear frame, respectively. Results from the simulation studies indicate that the proposed method is capable of identifying the dynamic load and structural parameters fairly accurately. This method could also identify the time-variant and nonlinear structural parameter even with contaminated incomplete measurement.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002134023
|
oai_dc
|
Effects of deformation of elastic constraints on free vibration characteristics of cantilever Bernoulli-Euler beams
|
Effects of deformation of elastic constraints on free vibration characteristics of cantilever Bernoulli-Euler beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tong Wang(Shanghai Normal University); Tao He(Shanghai Normal University); Hongjing Li(University of Birmingham)"
] |
Elastic constraints are usually simplified as “spring forces” exerted on beam ends without considering the “spring deformation”. The partial differential equation governing the free vibrations of a cantilever Bernoulli-Euler beam considering the deformation of elastic constraints is firstly established, and is nondimensionalized to obtain two dimensionless factors, κv and κr, describing the effects of elastically vertical and rotational end constraints, respectively. Then the frequency equation for the above Bernoulli- Euler beam model is derived using the method of separation of variables. A numerical analysis method is proposed to solve the transcendental frequency equation for the continuous change of the frequency with κv and κr. Then the mode shape functions are given. Finally, effects of κv and κr on free vibration characteristics of the beam with different slenderness ratios are calculated and analyzed. The results indicate that the effects of κv are larger on higher-order free vibration characteristics than on lower-order ones, and the impact strength decreases with slenderness ratio. Under a relatively larger slenderness ratio, the effects of κv can be neglected for the fundamental frequency characteristics, while cannot for higher-order ones. However, the effects of κr are large on both higher- and lower-order free vibration characteristics, and cannot be neglected no matter the slenderness ratio is large or small.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002134005
|
oai_dc
|
A numerical and experimental approach for optimal structural section design of offshore aluminium helidecks
|
A numerical and experimental approach for optimal structural section design of offshore aluminium helidecks
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"서정관(부산대학교); 박대겸(부산대학교 선박해양플랜트기술연구원); 조성우(부산대학교); 박주신(삼성중공업 구조연구소); 구정본(삼성중공업); 하영수(삼성중공업); 장기복(삼성중공업 조선프랜트연구소)"
] |
Helicopters are essential for supporting offshore oil and gas activities around the world. To ensure accessibility for helicopters, helideck structures must satisfy the safety requirements associated with various environmental and accidental loads. Recently, offshore helideck structures have used aluminium because of its light weight, low maintenance requirements, cost effectiveness and easy installation. However, section designs of aluminum pancakes tend to modify and/or change from the steel pancakes. Therefore, it is necessary to optimize section design and evaluate the safety requirements for aluminium helideck. In this study, a design procedure was developed based on section optimization techniques with experimental studies, industrial regulations and nonlinear finite element analyses. To validate and verify the procedure, a new aluminium section was developed and compared strength capacity with the existing helideck section profiles.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002113703
|
oai_dc
|
Analysis of the adhesive damage for different patch shapes in bonded composite repair of corroded aluminum plate
|
Analysis of the adhesive damage for different patch shapes in bonded composite repair of corroded aluminum plate
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Berrahou Mohamed(University of Sidi Bel Abbes); B. Bachir Bouiadjra(University of Sidi Bel Abbes)"
] |
Many military and commercial aging aircrafts flying beyond their design life may experience severe crack and corrosion damage, and thus lead to catastrophic failures. In this paper, were used in a finite element model to evaluate the effect of corrosion on the adhesive damage in bonded composite repair of aircraft structures. The damage zone theory was implemented in the finite element code in order to achieve this objective. In addition, the effect of the corrosion, on the repair efficiency. Four different patch shapes were chosen to analyze the adhesive damage: rectangular, trapezoidal, circular and elliptical. The modified damage zone theory was implemented in the FE code to evaluate the adhesive damage. The obtained results show that the adhesive damage localized on the level of corrosion and in the sides of patch, and the rectangular patch offers high safety it reduces considerably the risk of the adhesive failure.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002113705
|
oai_dc
|
Nonlinear higher order Reddy theory for temperature- dependent vibration and instability of embedded functionally graded pipes conveying fluid-nanoparticle mixture
|
Nonlinear higher order Reddy theory for temperature- dependent vibration and instability of embedded functionally graded pipes conveying fluid-nanoparticle mixture
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Raminnea(University of Tabriz); H. Biglari(University of Tabriz); F. Vakili Tahami(University of Tabriz)"
] |
This paper addresses temperature-dependent nonlinear vibration and instability of embedded functionally graded (FG) pipes conveying viscous fluid-nanoparticle mixture. The surrounding elastic medium is modeled by temperature-dependent orthotropic Pasternak medium. Reddy third-order shear deformation theory (RSDT) of cylindrical shells are developed using the strain-displacement relations of Donnell theory. The well known Navier-Stokes equation is used for obtaining the applied force of fluid to pipe. Based on energy method and Hamilton‟s principal, the governing equations are derived. Generalized differential quadrature method (GDQM) is applied for obtaining the frequency and critical fluid velocity of system. The effects of different parameters such as mode numbers, nonlinearity, fluid velocity, volume percent of nanoparticle in fluid, gradient index, elastic medium, boundary condition and temperature gradient are discussed. Numerical results indicate that with increasing the stiffness of elastic medium and decreasing volume percent of nanoparticle in fluid, the frequency and critical fluid velocity increase. The presented results indicate that the material in-homogeneity has a significant influence on the vibration and instability behaviors of the FG pipes and should therefore be considered in its optimum design. In addition, fluid velocity leads to divergence and flutter instabilities.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002113699
|
oai_dc
|
Coupled solid and fluid mechanics simulation for estimating optimum injection pressure during reservoir CO2-EOR
|
Coupled solid and fluid mechanics simulation for estimating optimum injection pressure during reservoir CO2-EOR
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ayub Elyasi(Tarbiat Modares University); Kamran Goshtasbi(Tarbiat Modares University); Hamid Hashemolhosseini(Isfahan University of Technology); Sharif Barati(Shahrood University of technology)"
] |
Reservoir geomechanics can play an important role in hydrocarbon recovery mechanism. In CO2-EOR process, reservoir geomechanics analysis is concerned with the simultaneous study of fluid flow and the mechanical response of the reservoir under CO2 injection. Accurate prediction of geomechanical effects during CO2 injection will assist in modeling the Carbon dioxide recovery process and making a better design of process and production equipment. This paper deals with the implementation of a program (FORTRAN 90 interface code), which was developed to couple conventional reservoir (ECLIPSE) and geomechanical (ABAQUS) simulators, using a partial coupling algorithm. A geomechanics reservoir partially coupled approach is presented that allows to iteratively take the impact of geomechanics into account in the fluid flow calculations and therefore performs a better prediction of the process. The proposed approach is illustrated on a realistic field case. The reservoir geomechanics coupled models show that in the case of lower maximum bottom hole injection pressure, the cumulative oil production is more than other scenarios. Moreover at the high injection pressures, the production rates will not change with the injection bottom hole pressure variations. Also the FEM analysis of the reservoir showed that at CO2 injection pressure of 11000 Psi the plastic strain has been occurred in the some parts of the reservoir and the related stress path show a critical behavior.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002113701
|
oai_dc
|
Elastic analysis effect of adhesive layer characteristics in steel beam strengthened with a fiber-reinforced polymer plates
|
Elastic analysis effect of adhesive layer characteristics in steel beam strengthened with a fiber-reinforced polymer plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tahar Hassaine Daouadji(Université Ibn Khaldoun Tiaret); Lazreg Hadji(Université Ibn Khaldoun Tiaret); Mohamed Ait Amar Meziane(Université Ibn Khaldoun Tiaret); Hadj Bekki(Université Ibn Khaldoun Tiaret)"
] |
In this paper, the problem of interfacial stresses in steel beams strengthened with a fiber reinforced polymer plates is analyzed using linear elastic theory. The analysis is based on the deformation compatibility approach developed by Tounsi (2006) where both the shear and normal stresses are assumed to be invariant across the adhesive layer thickness. The analysis provides efficient calculations for both shear and normal interfacial stresses in steel beams strengthened with composite plates, and accounts for various effects of Poisson’s ratio and Young’s modulus of adhesive. Such interfacial stresses play a fundamental role in the mechanics of plated beams, because they can produce a sudden and premature failure. The analysis is based on equilibrium and deformations compatibility approach developed by Tounsi (2006). In the present theoretical analysis, the adherend shear deformations are taken into account by assuming a parabolic shear stress through the thickness of both the steel beam and bonded plate. The paper is concluded with a summary and recommendations for the design of the strengthened beam.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002113702
|
oai_dc
|
Exact analysis of bi-directional functionally graded beams with arbitrary boundary conditions via the symplectic approach
|
Exact analysis of bi-directional functionally graded beams with arbitrary boundary conditions via the symplectic approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Li Zhao(Ningbo University of Technology); Jun Zhu(Zhejiang University of Technology); Xiao D. Wen(Yunnan Minzu University)"
] |
Elasticity solutions for bi-directional functionally graded beams subjected to arbitrary lateral loads are conducted, with emphasis on the end effects. The material is considered macroscopically isotropic, with Young’s modulus varying exponentially in both axial and thickness directions, while Poisson’s ratio remaining constant. In order to obtain an exact analysis of stress and displacement fields, the symplectic analysis based on Hamiltonian state space approach is employed. The capability of the symplectic framework for exact analysis of bi-directional functionally graded beams has been validated by comparing numerical results with corresponding ones in open literature. Numerical results are provided to demonstrate the influences of the material gradations on localized stress distributions. Thus, the material properties of the bi-directional functionally graded beam can be tailored for the potential practical purpose by choosing suitable graded indices.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002113700
|
oai_dc
|
Progressive collapse analysis of steel building considering effects of infill panels
|
Progressive collapse analysis of steel building considering effects of infill panels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Abbasi Zoghi(K.N. Toosi University of Technology); Masoud Mirtaheri(K.N. Toosi University of Technology)"
] |
Simplifier assumptions which are used in numerical studies of progressive collapse phenomenon in structures indicate inconsistency between the numerical and experimental full-scale results. Neglecting the effects of infill panels and two-dimensional simulation are some of these assumptions. In this study, an existing seismically code-designed steel building is analyzed with alternate path method (AP) to assess its resistance against progressive collapse. In the AP method, the critical columns be removed immediately and stability of the remaining structure is investigated. Analytical macro-model based on the equivalent strut approach is used to simulate the effective infill panels. The 3-dimentional nonlinear dynamic analysis results show that modeling the slabs and infill panels can increase catenary actions and stability of the structure to resist progressive collapse even if more than one column removed. Finally, a formula is proposed to determine potential of collapse of the structure based on the quantity and quality of the produced plastic hinges in the connections.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002113697
|
oai_dc
|
Nonlinear vibration analysis of a type of tapered cantilever beams by using an analytical approximate method
|
Nonlinear vibration analysis of a type of tapered cantilever beams by using an analytical approximate method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Weipeng Sun(Jilin University); Youhong Sun(Jilin University); Yongping Yu(Jilin University); Shaopeng Zheng(Jilin University)"
] |
In this paper, an alternative analytical method is presented to evaluate the nonlinear vibration behavior of single and double tapered cantilever beams. The admissible lateral displacement function satisfying the geometric boundary conditions of a single or double tapered cantilever beam is derived by using Rayleigh-Ritz method. Based on the Lagrange method and the Newton Harmonic Balance (NHB) method, analytical approximate solutions in closed and explicit form are obtained. These approximate solutions show excellent agreement with those of numeric method for small as well as large amplitude. Moreover, due to brevity of expressions, the present analytical approximate solutions are convenient to investigate effects of various parameters on the large amplitude vibration response of tapered beams.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002113704
|
oai_dc
|
Experimental investigation on self-compacting concrete reinforced with steel fibers
|
Experimental investigation on self-compacting concrete reinforced with steel fibers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Orod Zarrin(Eastern Mediterranean University); Hamid Reza Khoshnoud(Islamic Azad University)"
] |
Self-Compacting Concrete (SCC) has been originally developed in Japan to offset a growing shortage of skilled labors, is a highly workable concrete, which is not needed to any vibration or impact during casting. The utilizing of fibers in SCC improves the mechanical properties and durability of hardened concrete such as impact strength, flexural strength, and vulnerability to cracking. The purpose of this investigation is to determine the effect of steel fibers on mechanical performance of traditionally reinforced Self-Competing Concrete beams. In this study, two mixes Mix 1% and Mix 2% containing 1% and 2% volume friction of superplasticizer are considered. For each type of mixture, four different volume percentages of 60/30 (length/diameter) fibers of 0.0%, 1.0%, 1.5% and 2% were used. The mechanical properties were determined through compressive and flexural tests. According to the experimental test results, an increase in the steel fibers volume fraction in Mix 1% and Mix 2% improves compressive strength slightly but decreases the workability and other rheological properties of SCC. On the other hand, results revealed that flexural strength, energy absorption capacity and toughness are increased by increasing the steel fiber volume fraction. The results clearly show that the use of fibers improves the post-cracking behavior. The average spacing of between cracks decrease by increasing the fiber volume fraction. Furthermore, fibers increase the tensile strength by bridging actions through the cracks. Therefore, steel fibers increase the ductility and energy absorption capacity of RC elements subjected to flexure.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002113707
|
oai_dc
|
Operational modal analysis of structures by stochastic subspace identification with a delay index
|
Operational modal analysis of structures by stochastic subspace identification with a delay index
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Dan Li(Hefei University of Technology); Wei-Xin Ren(Hefei University of Technology); Yi-Ding Hu(Wuyi University); Dong Yang(Hefei University of Technology)"
] |
Practical ambient excitations of engineering structures usually do not comply with the stationary-white-noise assumption in traditional operational modal analysis methods due to heavy traffic, wind guests, and other disturbances. In order to eliminate spurious modes induced by non-white noise inputs, the improved stochastic subspace identification based on a delay index is proposed in this paper for a representative kind of stationary non-white noise ambient excitations, which have nonzero autocorrelation values near the vertical axis. It relaxes the stationary-white-noise assumption of inputs by avoiding corresponding unqualified elements in the Hankel matrix. Details of the improved stochastic subspace identification algorithms and determination of the delay index are discussed. Numerical simulations on a four-story frame and laboratory vibration experiments on a simply supported beam have demonstrated the accuracy and reliability of the proposed method in eliminating spurious modes under non-white noise ambient excitations.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002113698
|
oai_dc
|
Structural redundancy of 3D RC frames under seismic excitations
|
Structural redundancy of 3D RC frames under seismic excitations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ali Massumi(Kharazmi University); Ramin Mohammadi(Kharazmi University)"
] |
The components of the seismic behavior factor of RC frames are expected to change as structural redundancy increases. Most researches indicate that increasing redundancy is desirable in response to stochastic events such as earthquake loading. The present paper investigated the effect of redundancy on a fixed plan for seismic behavior factor components and the nonlinear behavior of RC frames. The 3D RC moment resistant frames with equal lateral resistance were designed to examine the role of redundancy in earthquake-resistant design and to distinguish it from total overstrength capacity. The seismic behavior factor and dynamic behavior of structures under natural strong ground motions were numerically evaluated as the judging criteria for structural seismic behavior. The results indicate that increasing redundancy alone in a fixed plan cannot be defined as a criterion for improving the structural seismic behavior.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002114937
|
oai_dc
|
Retrofitting of steel pile-abutment connections of integral bridges using CFRP
|
Retrofitting of steel pile-abutment connections of integral bridges using CFRP
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Seyed Saeed Mirrezaei(University of Tabriz); Majid Barghian(University of Tabriz); Hossein Ghaffarzadeh(University of Tabriz); Masood Farzam(University of Tabriz)"
] |
Integral bridges are typically designed with flexible foundations that include one row of piles. The construction of integral bridges solves difficulties due to the maintenance of expansion joints and bearings during serviceability. It causes integral bridges to become more economic comparing with conventional bridges. Research has been focused not only to enhance the seismic performance of newly designed bridges, but also to develop retrofit strategies for existing ones. The local performance of the pile to abutment connection will have a major effect on the performance of the structure and the embedment length of pile inside the abutment has a key role to provide shear and flexural resistance of pile-abutment connections. In this paper, a simple method was developed to estimate the initial value of embedment length of the pile for retrofitting of specimens. Four specimens of pile-abutment connections were constructed with different embedment lengths of pile inside the abutment to evaluate their performances. The results of the experimentation in conjunction with numerical and analytical studies showed that retrofitting pile-abutment connections with CFRP wraps increased the strength of the connection up to 86%. Also, designed connections with the proposed method had sufficient resistance against lateral load.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002114942
|
oai_dc
|
Fracture behavior of fly ash concrete containing silica fume
|
Fracture behavior of fly ash concrete containing silica fume
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Peng Zhang(Zhengzhou University); Ji-Xiang Gao(Zhengzhou University); Xiao-Bing Dai(Zhengzhou University); Tian-Hang Zhang(Zhengzhou University); Juan Wang(Zhengzhou University)"
] |
Effect of silica fume on fresh properties, compressive strength at 28 days and fracture behavior of fly ash concrete composite were studied in this paper. Test results indicated that the fluidity and flowability of fly ash concrete composites decreased and fly ash concrete composite are more cohesive and appear to be sticky with the addition of silica fume. Addition of silica fume was very effective in improving the compressive strength at 28 days of fly ash concrete composite, and the compressive strength of fly ash concrete composite has a trend of increase with the increase of silica fume content. Results also indicated that all the fracture parameters of effective crack length, fracture toughness, fracture energy, the critical crack opening displacement and the maximum crack opening displacement of fly ash concrete composite decreased with the addition of silica fume. When the content of silica fume increased from 3% to 12%, these fracture parameters decreased gradually with the increase of silica fume content. Furthermore, silica fume had great effect on the relational curves of the three-point bending beam specimen. As the silica fume content increased from 3% to 12%, the areas surrounded by the three relational curves and the axes were becoming smaller and smaller, which indicated that the capability of concrete composite containing fly ash to resist crack propagation was becoming weaker and weaker.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002114941
|
oai_dc
|
Transient response analysis of tapered FRP poles with flexible joints by an efficient one-dimensional FE model
|
Transient response analysis of tapered FRP poles with flexible joints by an efficient one-dimensional FE model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Behnam Saboori(Iran University of Science and Technology); Seyed Mohammad Reza Khalili(Kingston University)"
] |
This research develops a finite element code for the transient dynamic analysis of tapered fiber reinforced polymer (FRP) poles with hollow circular cross-section and flexible joints used in power transmission lines. The FRP poles are modeled by tapered beam elements and their flexible joints by a rotational spring. To solve the time equations of transient dynamic analysis, precise time integration method is utilized. In order to verify the utilized formulations, a typical jointed FRP pole under step, triangular and sine pulses is analyzed by the developed finite element code and also ANSYS commercial finite element software for comparison. Thereafter, the effect of joint flexibility on its dynamic behavior is investigated. It is observed that by increasing the joint stiffness, the amplitude of the pole tip deflection history decreases, and the time of occurrence of the maximum deflection is earlier.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002114972
|
oai_dc
|
Effect of pre-stressed cable on pre-stressed mega-braced steel frame
|
Effect of pre-stressed cable on pre-stressed mega-braced steel frame
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tang Baijian(Jiangsu University of Science and Technology); Zhang Fuxing(Jiangsu University of Science and Technology); Wang Yi(Jiangsu University of Science and Technology); Wang Fei(Jiangsu University of Science and Technology)"
] |
This study addresses the effect of pre-stressed cables on a pre-stressed mega-braced steel frame through employing static analysis and pushover analysis. The performances of a pre-stressed mega-braced steel frame and a pure steel frame without mega-braces are compared in terms of base shear, ductility, and failure mode. The influence of the cable parameters is also analyzed. Numerical results show that cable braces can effectively improve the lateral stiffness of a pure frame. However, it reduces structural ductility and degenerates structural pre-failure lateral stiffness greatly. Furthermore, it is found that 20% fluctuation in the cable pretension has little effect on structural ultimate bearing capacity and lateral stiffness. As comparison, 20% fluctuation in the cable diameter has much greater impact.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002114945
|
oai_dc
|
Seismic performance evaluation of mid-rise shear walls: experiments and analysis
|
Seismic performance evaluation of mid-rise shear walls: experiments and analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y.M. Parulekar(Bhabha Atomic Research Centre); G.R. Reddy(Bhabha Atomic Research Centre); R.K. Singh(Bhabha Atomic Research Centre); N. Gopalkrishnan(Structural Engineering Research Centre); G.V. Ramarao(Structural Engineering Research Centre)"
] |
Seismic performance evaluation of shear wall is essential as it is the major lateral load resisting member of a structure. The ultimate load and ultimate drift of the shear wall are the two most important parameters which need to be assessed experimentally and verified analytically. This paper comprises the results of monotonic tests, quasi-static cyclic tests and shake-table tests carried out on a midrise shear wall. The shear wall considered for the study is 1:5 scaled model of the shear wall of the internal structure of a reactor building. The analytical simulation of these tests is carried out using micro and macro modeling of the shear wall. This paper mainly consists of modification in the hysteretic macro model, developed for RC structural walls by Lestuzzi and Badoux in 2003. This modification is made by considering the stiffness degradation effect observed from the tests carried out and this modified model is then used for nonlinear dynamic analysis of the shear wall. The outcome of the paper gives the variation of the capacity, the failure patterns and the performance levels of the shear walls in all three types of tests. The change in the stiffness and the damping of the wall due to increased damage and cracking when subjected to seismic excitation is also highlighted in the paper.
|
토목공학
| null |
kci_detailed_000070.xml
|
|||
ART002114944
|
oai_dc
|
Study of ground vibration induced by high-speed trains moving on multi-span bridges
|
Study of ground vibration induced by high-speed trains moving on multi-span bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.H. Ju(National Cheng-Kung University)"
] |
This paper investigates the ground vibration induced by high-speed trains moving on multi-span continuous bridges. The dynamic impact factor of multi-span continuous bridges under trainloads was first determined in the parametric study, which shows that the dynamic impact factor will be large when the first bridge vertical natural frequency is equal to the trainload dominant frequencies, nV/D, where n is a positive integer, V is the train speed, and D is the train carriage interval. In addition, more continuous spans will produce smaller dynamic impact factors at this resonance condition. Based on the results of three-dimensional finite element analyses using the soil-structure interaction for realistic high-speed railway bridges, we suggest that the bridge span be set at 1.4 to 1.5 times the carriage interval for simply supported bridges. If not, the use of four or more-than-four-span continuous bridges is suggested to reduce the train-induced vibration. This study also indicates that the vibration in the train is major generated from the rail irregularities and that from the bridge deformation is not dominant.
|
토목공학
| null |
kci_detailed_000070.xml
|
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