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ART001535813
|
oai_dc
|
The numerical solution of dynamic response of SDOF systems using cubic B-spline polynomial functions
|
The numerical solution of dynamic response of SDOF systems using cubic B-spline polynomial functions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Shojaee(Shahid Bahonar University of Kerman); S. Rostami(Islamic Azad University); A. Moeinadini(Islamic Azad University)"
] |
In this paper, we present a new explicit procedure using periodic cubic B-spline interpolation polynomials to solve linear and nonlinear dynamic equation of motion governing single degree of freedom (SDOF) systems. In the proposed approach, a straightforward formulation was derived from the approximation of displacement with B-spline basis in a fluent manner. In this way, there is no need to use a special pre-starting procedure to commence solving the problem. Actually, this method lies in the case of conditionally stable methods. A simple step-by-step algorithm is implemented and presented to calculate dynamic response of SDOF systems. The validity and effectiveness of the proposed method is demonstrated with four examples. The results were compared with those from the numerical methods such as Duhamel integration, Linear Acceleration and also Exact method. The comparison shows that the proposed method is a fast and simple procedure with trivial computational effort and acceptable accuracy exactly like the Linear Acceleration method. But its power point is that its time consumption is notably less than the Linear Acceleration method especially in the nonlinear analysis.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001535814
|
oai_dc
|
A load increment method for ductile reinforced concrete (RC) frame structures considering strain hardening effects
|
A load increment method for ductile reinforced concrete (RC) frame structures considering strain hardening effects
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Günhan Aksoylu(Istanbul Technical University); Konuralp Girgin(Istanbul Technical University)"
] |
This study introduces a new load increment method for the ductile reinforced concrete (RC) frame structures by including strain-hardening effects. The proposed method is a nonlinear static analysis technique employed for RC frame structures subjected to constant gravity loads and monotonically increasing lateral loads. The material nonlinearity in RC structural elements is considered by adopting plastic hinge concept which is extended by including the strain hardening as well as interaction between bending moment and axial force. Geometric non-linearity, known as second order effect, is implemented to the method as well.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001479343
|
oai_dc
|
An analytical solution of bending thin plates with different moduli in tension and compression
|
An analytical solution of bending thin plates with different moduli in tension and compression
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiao-ting He(Chongqing University); Xing-jian Hu(Chongqing University); Jun-yi Sun(Chongqing University); Zhou-lian Zheng(Chongqing University)"
] |
Materials which exhibit different elastic moduli in tension and compression are known as bimodular materials. The bimodular materials model, which is founded on the criterion of positivenegative signs of principal stress, is important for the structural analysis and design. However, due to the inherent complexity of the constitutive relation, it is difficult to obtain an analytical solution of a bimodular bending components except in particular simple problems. Based on the existent simplified model, this paper solves analytically bending thin plates with different moduli in tension and compression. By using the continuity conditions of stress components in unknown neutral layer, we determine the location of the neutral layer, and derive the governing differential equation for deflection, the flexural rigidity, and the internal forces in the thin plate. We also use a circular thin plate with bimodulus to illustrate the application of this solution derived in this paper. The results show that the introduction of different moduli has influences on the flexural stiffness of the bending thin plate.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001479334
|
oai_dc
|
Modeling of unreinforced brick walls under in-plane shear & compression loading
|
Modeling of unreinforced brick walls under in-plane shear & compression loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Arsalan Kalali(Amirkabir University of Technology); Mohammad Zaman Kabir(Amirkabir University of Technology)"
] |
The study of the seismic vulnerability of masonry buildings requires structural properties of walls such as stiffness, ultimate load capacity, etc. In this article, a method is suggested for modeling the masonry walls under in-plane loading. At the outset, a set of analytical equations was established for determining the elastic properties of an equivalent homogeneous material of masonry. The results for homogenized unreinforced brick walls through detailed modeling were compared in different manners such as solid and perforated walls, in-plane and out-of-plane loading, etc, and it was found that this method provides suitable accuracy in estimation of the wall linear properties. Furthermore, comparison of the results of proposed modeling with experimental out coming indicated that this model considers the non linear properties of the wall such as failure pattern, performance curve and ultimate strength, and would be appropriate to establish a parametric study on those prone factors. The proposed model is complicated; therefore, efforts need to be made in order to overcome the convergency problems which will be included in this study. The nonlinear model is basically semi-macro but through a series of actions, it can be simplified to a macro model.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001479336
|
oai_dc
|
Vibration analysis of plates with curvilinear quadrilateral domains by discrete singular convolution method
|
Vibration analysis of plates with curvilinear quadrilateral domains by discrete singular convolution method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ömer Civalek(Akdeniz University); Baki Ozturk(Nigde University)"
] |
A methodology on application of the discrete singular convolution (DSC) technique to the free vibration analysis of thin plates with curvilinear quadrilateral platforms is developed. In the proposed approach, irregular physical domain is transformed into a rectangular domain by using geometric coordinate transformation. The DSC procedures are then applied to discretization of the transformed set of governing equations and boundary conditions. For demonstration of the accuracy and convergence of the method, some numerical examples are provided on plates with different geometry such as elliptic, trapezoidal having straight and parabolic sides, sectorial, annular sectorial, and plates with four curved edges. The results obtained by the DSC method are compared with those obtained by other numerical and analytical methods. The method is suitable for the problem considered due to its generality, simplicity, and potential for further development.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001479338
|
oai_dc
|
Progressive collapse analysis of a RC building subjected to blast loads
|
Progressive collapse analysis of a RC building subjected to blast loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"T.H. Almusallam(King Saud University); H.M. Elsanadedy(King Saud University); H. Abbas(King Saud University); S.H. Alsayed(King Saud University); Y.A. Al-Salloum(King Saud University)"
] |
The paper seeks to explore some aspects of the current state of knowledge on progressive collapse in the technical literature covering blast loads and structural analysis procedure applicable to reinforced concrete (RC) buildings. The paper describes the progressive collapse analysis of a commercial RC building located in the city of Riyadh and subjected to different blast scenarios. A 3-D finite element model of the structure was created using LS-DYNA, which uses explicit time integration algorithms for solution. Blast loads were treated as dynamic pressure-time history curves applied to the exterior elements. The inherent shortcomings of notional member removal have been taken care of in the present paper by simulating the damage of structural elements through the use of solid elements with the provision of element erosion. Effects of erosion and cratering are studied for different scenarios of the blast.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001479339
|
oai_dc
|
Development of a nonlinear seismic response capacity spectrum method for intake towers of dams
|
Development of a nonlinear seismic response capacity spectrum method for intake towers of dams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Leonardo Cocco(National University of Cordoba); Luis E. Suárez(University of Puerto Rico); Enrique E. Matheu(Office of Infrastructure Protection)"
] |
The seismic-induced failure of a dam could have catastrophic consequences associated with the sudden release of the impounded reservoir. Depending on the severity of the seismic hazard, the characteristics and size of the dam-reservoir system, preventing such a failure scenario could be a problem of critical importance. In many cases, the release of water is controlled through a reinforced-concrete intake tower. This paper describes the application of a static nonlinear procedure known as the Capacity Spectrum Method (CSM) to evaluate the structural integrity of intake towers subject to seismic ground motion. Three variants of the CSM are considered: a multimodal pushover scheme, which uses the idea proposed by Chopra and Goel (2002); an adaptive pushover variant, in which the change in the stiffness of the structure is considered; and a combination of both approaches. The effects caused by the water surrounding the intake tower, as well as any water contained inside the hollow structure, are accounted for by added hydrodynamic masses. A typical structure is used as a case study, and the accuracy of the CSM analyses is assessed with time history analyses performed using commercial and structural analysis programs developed in Matlab.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001479346
|
oai_dc
|
Fuzzy hybrid control of a wind-excited tall building
|
Fuzzy hybrid control of a wind-excited tall building
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"강주원(영남대학교); 김현수(Sunmoon University)"
] |
A fuzzy hybrid control technique using a semi-active tuned mass damper (STMD) has been proposed in this study for mitigation of wind induced motion of a tall building. For numerical simulation, a third generation benchmark is employed for a wind-excited 76-story building. A magnetorheological (MR) damper is used to compose an STMD. The proposed control technique employs a hierarchical structure consisting of two lower-level semi-active controllers (sub-controllers) and a higher-level fuzzy hybrid controller. Skyhook and groundhook control algorithms are used as sub-controllers. When a wind load is applied to the benchmark building, each sub-controller provides different control commands for the STMD. These control commands are appropriately combined by the fuzzy hybrid controller during realtime control. Results from numerical simulations demonstrate that the proposed fuzzy hybrid control technique can effectively reduce the STMD motion as well as building responses compared to the conventional hybrid controller. In addition, it is shown that the control performance of the STMD is superior to that of the sample TMD and comparable to an active TMD, but with a significant reduction in power consumption.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001479341
|
oai_dc
|
A discrete particle model for reinforced concrete fracture analysis
|
A discrete particle model for reinforced concrete fracture analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"N. Monteiro Azevedo(LNEC); J.V. Lemos(LNEC); J.R. Almeida(Faculdade de Ciências e Tecnologia)"
] |
The Discrete Element Method adopting particles for the domain discretization has recently been adopted in fracture studies of non-homogeneous continuous media such as concrete and rock. A model is proposed in which the reinforcement is modelled by 1D rigid-spring discrete elements. The rigid bars interact with the rigid circular particles that simulate the concrete through contact interfaces. The DEM enhanced model with reinforcement capabilities is evaluated using three point bending and four point bending tests on reinforced concrete beams without stirrups. Under three point bending, the model is shown to reproduce the expected final crack pattern, the crack propagation and the load displacement diagram. Under four point bending, the model is shown to match the experimental ultimate load, the size effect and the crack propagation and localization.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001542654
|
oai_dc
|
Theoretical analysis of tensile stresses and displacement in orthotropic circular column under diametrical compression
|
Theoretical analysis of tensile stresses and displacement in orthotropic circular column under diametrical compression
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Takashi Tsutsumi(Kagoshima National College of Technology); Hiroshi Iwashita(Kyushu Railway Company); Kagenobu Miyahara(Kagoshima National College of Technology)"
] |
This paper shows the solution for an orthotropic disk under the plane strain condition obtained with complex stress functions. These stress functions were induced by Lekhnitskii and expanded by one of the authors. Regarding diametrical compression test, the finite element method poses difficulties in representing the concentrated force because the specimens must be divided into finite elements during calculation. On the other hand, the method shown in this study can exactly represent this force. Some numerical results are shown and compared with those obtained under the plane stress condition for both stress and displacement. This comparison shows that the differences between the tensile stresses occurred under the plane strain condition and also that the differences under a plane stress condition increase as the orthotropy ratio increases for some cases.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001542646
|
oai_dc
|
Dynamics of a bridge beam under a stream of moving elements. Part 1 – Modelling and numerical integration
|
Dynamics of a bridge beam under a stream of moving elements. Part 1 – Modelling and numerical integration
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Podworna(Wroclaw University of Technology)"
] |
A new conception of fundamental tasks in dynamics of the bridge-track-train systems (BTT), with the aim to evaluate moving load’s models adequacy, has been developed. The 2D physical models of BTT systems, corresponding to the fundamental tasks, have been worked out taking into account one-way constraints between the moving unsprung masses and the track. A method for deriving the implicit equations of motion, governing vibrations of BTT systems’ models, as well as algorithms for numerical integration of these equations, leading to the solutions of high accuracy and relatively short times of simulations, have been also developed. The derived equations and formulated algorithms constitute the basis for numerical simulation of vibrations of the considered systems.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001542649
|
oai_dc
|
The combined deterministic stochastic subspace based system identification in buildings
|
The combined deterministic stochastic subspace based system identification in buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Pelin Gundes Bakir(Istanbul Technical University)"
] |
The Combined Deterministic Stochastic Subspace based System Identification Technique (CDSSSIT) is a powerful input-output system identification technique which is known to be always convergent and numerically stable. The technique determines a Kalman state sequence from the projection of the output-input data. The state space matrices are determied subsequently from this Kalman state sequence using least squares. The objective of this paper is to examine the efficiency of the CDSSSIT in identifying the modal parameters (frequencies and mode shapes) of a stiff structure. The results show that the CDSSSIT predicts the modal parameters of stiff buildings quite accurately but is very sensitive to the location of sensors.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001542648
|
oai_dc
|
Dynamics of a bridge beam under a stream of moving elements. Part 2 – Numerical simulations
|
Dynamics of a bridge beam under a stream of moving elements. Part 2 – Numerical simulations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Podworna(Wroclaw University of Technology)"
] |
The paper constitutes the second part of the author’s study. The first part (Podworna 2010) formulates four fundamental tasks in dynamics of the bridge-track-train systems. The following cyclic moving loads are considered: a concentrated forces stream (model P), an unsprung masses stream (model M), a single-mass viscoelastic oscillators stream (model M_o) and a double-mass viscoelastic oscillators stream (model MM_o). Three problems precluding to the numerical simulations have been developed, i.e., prediction of the forced resonances, the parameters of integration of equations of motion, the output results. A computer programme was written in Pascal and numerical research in the scope of the fundamental tasks was worked out. The investigations were focused on adequacy evaluation of the moving load models, P, M, M_o, MM_o, in predicting dynamic processes in railway bridges.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001542662
|
oai_dc
|
Compression of hollow-circular fiber-reinforced rubber bearings
|
Compression of hollow-circular fiber-reinforced rubber bearings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Seval Pinarbasi(Kocaeli University); Fuad Okay(Kocaeli University)"
] |
Earlier studies on hollow-circular rubber bearings, all of which are conducted for steelreinforced bearings, indicate that the hole presence not only decreases the compression modulus of the bearing but also increases the maximum shear strain developing in the bearing due to compression, both of which are basic design parameters also for fiber-reinforced rubber bearings. This paper presents analytical solutions to the compression problem of hollow-circular fiber-reinforced rubber bearings. The problem is handled using the most-recent formulation of the “pressure method”. The analytical solutions are, then, used to investigate the effects of reinforcement flexibility and hole presence on bearing’s compression modulus and maximum shear strain in the bearing in view of four key parameters: (i) reinforcement extensibility, (ii) hole size, (iii) bearing’s shape factor and (iv) rubber compressibility. It is shown that the compression stiffness of a hollow-circular fiber-reinforced bearing may decrease considerably as reinforcement flexibility and/or hole size increases particularly if the shape factor of the bearing is high and rubber compressibility is not negligible. Numerical studies also show that the existence of even a very small hole can increase the maximum shear strain in the bearing significantly, which has to be considered in the design of such annular bearings.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001542645
|
oai_dc
|
An improved parametric formulation for the variationally correct distortion immune three-noded bar element
|
An improved parametric formulation for the variationally correct distortion immune three-noded bar element
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Somenath Mukherjee(CSIR); S. Manju(CSIR)"
] |
A new method of formulation of a class of elements that are immune to mesh distortion effects is proposed here. The simple three-noded bar element with an offset of the internal node from the element center is employed here to demonstrate the method and the principles on which it is founded upon. Using the function space approach, the modified formulation is shown here to be superior to the conventional isoparametric version of the element since it satisfies the completeness requirement as the metric formulation, and yet it is in agreement with the best-fit paradigm in both the metric and the parametric domains. Furthermore, the element error is limited to only those that are permissible by the classical projection theorem of strains and stresses. Unlike its conventional counterpart, the modified element is thus not prone to any errors from mesh distortion. The element formulation is symmetric and thus satisfies the requirement of the conservative nature of problems associated with all self-adjoint differential operators. The present paper indicates that a proper mapping set for distortion immune elements constitutes geometric and displacement interpolations through parametric and metric shape functions respectively, with the metric components in the displacement/strain replaced by the equivalent geometric interpolation in parametric co-ordinates.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001542660
|
oai_dc
|
Theoretical research on the identification method of bridge dynamic parameters using free decay response
|
Theoretical research on the identification method of bridge dynamic parameters using free decay response
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guo-jin Tan(Jilin University); Yong-chun Cheng(Jilin University); Han-bing Liu(Jilin University); Long-lin Wang(Jilin University)"
] |
Input excitation and output response of structure are needed in conventional modal analysis methods. However, input excitation is often difficult to be obtained in the dynamic load test of bridge structures. Therefore, what attracts engineers’ attention is how to get dynamic parameters from the output response. In this paper, a structural experimental modal analysis method is introduced, which can be used to conveniently obtain dynamic parameters of the structure from the free decay response. With known damping coefficients, this analysis method can be used to identify the natural frequencies and the mode shapes of MDOF structures. Based on the modal analysis theory, the mathematical relationship of damping ratio and frequency is obtained. By using this mathematical relationship to improve the previous method, an improved experimental modal analysis method is proposed in this paper. This improved method can overcome the deficiencies of the previous method, which can not identify damping ratios and requires damping coefficients in advance. Additionally, this improved method can also identify the natural frequencies, mode shapes and damping ratios of the bridge only from the free decay response, and ensure the stability of identification process by using modern mathematical means. Finally, the feasibility and effectiveness of this method are demonstrated by a numerical example of a simply supported reinforced concrete beam.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001494016
|
oai_dc
|
A data mining approach to compressive strength of CFRP-confined concrete cylinders
|
A data mining approach to compressive strength of CFRP-confined concrete cylinders
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.M. Mousavi(Sharif University of Technology); A.H. Alavi(Iran University of Science and Technology); A.H. Gandomi(Tafresh University); M. Arab Esmaeili(Islamic Azad University); M. Gandomi(Iran University of Science and Technology)"
] |
In this paper, compressive strength of carbon fiber reinforced polymer (CFRP) confined concrete cylinders is formulated using a hybrid method coupling genetic programming (GP) and simulated annealing (SA), called GP/SA, and a robust variant of GP, namely multi expression programming (MEP).
Straightforward GP/SA and MEP-based prediction equations are derived for the compressive strength of CFRP-wrapped concrete cylinders. The models are constructed using two sets of predictor variables. The first set comprises diameter of concrete cylinder, unconfined concrete strength, tensile strength of CFRP laminate, and total thickness of CFRP layer. The most widely used parameters of unconfined concrete strength and ultimate confinement pressure are included in the second set. The models are developed based on the experimental results obtained from the literature. To verify the applicability of the proposed models, they are employed to estimate the compressive strength of parts of test results that were not included in the modeling process. A sensitivity analysis is carried out to determine the contributions of the parameters affecting the compressive strength. For more verification, a parametric study is carried out and the trends of the results are confirmed via some previous studies. The GP/SA and MEP models are able to predict the ultimate compressive strength with an acceptable level of accuracy. The proposed models perform superior than several CFRP confinement models found in the literature. The derived models are particularly valuable for pre-design purposes.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001494015
|
oai_dc
|
Cyclic load experiment study on the laminated composite RC walls with different concrete ages
|
Cyclic load experiment study on the laminated composite RC walls with different concrete ages
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hongmei Zhang(Tongji University); Xilin Lu(Tongji University); Jianbao Li(Tongji University); Lin Liang(Tongji University)"
] |
12 typical laminated composite reinforced concrete (RC) walls with different concrete ages and 3 cast-in-place RC walls subjected to low frequency cyclic load were carried out in this study. The failure mode, force-deformation response and energy dissipation capacity of these specimens were investigated. Differences of structural behaviours between composite RC walls and common cast-in-place RC walls were emphasized in the analysis. The compatibility of the composite specimens with different concrete ages was discussed based on the experiment. Test results indicated that the differences between the lateral bearing capacity and the displacement ductility of the composite walls and the common walls were not so obvious. Some of the composite specimen even has higher bearing capacity under the experiment loading situation. Besides, the two parts of the laminated composite specimens demonstrates incompatibility at the later loading sequence on failure mode and strain response when it is in tension.
Finally, this laminated composite shear walls are suggested to be applied in rapid reconstruction structures which is not very high.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001494014
|
oai_dc
|
Damage prediction of RC containment shell under impact and blast loading
|
Damage prediction of RC containment shell under impact and blast loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A.K. Pandey(Central Building Research Institute, Roorkee (CSIR))"
] |
There is world wide concern for safety of nuclear power installations after the terrorist attack on World Trade Center in 2001 and several other civilian structures in the last decade. The nuclear containment structure in many countries is a double shell structure (outer shell a RCC and inner a prestressed concrete). The outer reinforced concrete shell protects the inner shell and is designed for external loading like impact and blast. A comparative study of non-linear response of reinforced concrete nuclear containment cylindrical shell subjected to impact of an aircraft (Phantom) and explosion of different amounts of blast charges have been presented here. A material model which takes into account the strain rate sensitivity in dynamic loading situations, plastic and visco-plastic behavior in three dimensional stress state and cracking in tension has been developed earlier and implemented into a finite element code which has been validated with published literature. The analysis has been made using the developed software. Significant conclusions have been drawn for dissimilarity in response (deflections, stresses, cracks etc.) of the shell for impact and blast loading.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001494013
|
oai_dc
|
Application of frictional sliding fuse in infilled frames, fuse adjustment and influencing parameters
|
Application of frictional sliding fuse in infilled frames, fuse adjustment and influencing parameters
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Mohammadi-Gh(International Institute of Earthquake Engineering and Seismology); V. Akrami(Student of Sharif University)"
] |
An experimental investigation is conducted here to study the effects of applying frictional sliding fuses (FSF) in concrete infilled steel frames. Firstly, the influences of some parameters on the behavior of the sliding fuse are studied: Methods of adjusting the FSF for a certain sliding strength are explained and influences of time duration, welding and corrosion are investigated as well. Based on the results, time duration does not significantly affect the FSF, however influences of welding and corrosion of the constitutive plates are substantial. Then, the results of testing two 1/3 scale single-storey single-bay concrete infilled steel frames having FSF are presented. The specimens were similar, except for different regulations of their fuses, tested by displacement controlled cyclic loading. The results demonstrate that applying FSF improves infill behaviors in both perpendicular directions. The infilled frames with FSF have more appropriate hysteresis cycles, higher ductility, much lower deteriorations in strength and stiffness in comparison with regular ones. Consequently, the infills, provided with FSF, can be regarded as an engineered element, however, special consideration should be taken into the affecting parameters of their fuses.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001494011
|
oai_dc
|
In-plane vibrations of cracked slightly curved beams
|
In-plane vibrations of cracked slightly curved beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. Ridvan Oz(Fatih University)"
] |
In-plane vibrations of slightly curved beams having cracks are investigated numerically and experimentally. The curvature of the beam is circular and stays in the plane of vibration. Specimens made of steel with different lengths but with the same radius of curvature are used in the experiments. Cracks are opened using a hand saw having 0.4 mm thickness. Natural frequencies depending on location and depth of the cracks are determined using a Brüel & Kjaer 4366 type accelerometer. Then the beam is assumed as a Rayleigh type slightly curved beam in finite element method (FEM) including bending,extension and rotary inertia. A flexural rigidity equation given in literature for straight beams having a crack is used in the analysis. Frequencies are obtained numerically for different crack locations and depths. Experimental results are presented and compared with the numerical solutions. The natural frequencies are affected too much due to larger moments when the crack is around nodes. The effect can be neglected when it is at the location of maximum displacements. When the crack is close to the clamped end, the decrease in the frequencies in all modes is very high. The consistency of the results and validity of the equations are discussed.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001494010
|
oai_dc
|
Analytical studies on stress concentration due to a rectangular small hole in thin plate under bending loads
|
Analytical studies on stress concentration due to a rectangular small hole in thin plate under bending loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y. Yang(South China University of Technology); J.K. Liu(Sun Yat-sen University); C.W. Cai(Sun Yat-sen University)"
] |
In general means, the stress concentration problem of elastic plate with a rectangular hole can be investigated by numerical methods, and only approximative results are derived. This paper deduces an analytical study of the stress concentration due to a rectangular hole in an elastic plate under bending loads. Base on classical elasticity theory and FEM applying the U-transformation technique, the uncoupled governing equations with 3-DOF are established, and the analytical displacement solutions of the finite element equations are derived in series form or double integral form. Therefore, the stress concentration factor can then be discussed easily and conveniently. For the plate subjected to unidirectional bending loads, the non-conforming plate bending element with four nodes and 12-DOF is taken as examples to demonstrate the application of the proposed method. The inner force distribution is obtained. The solutions are adequate for the condition when the hole is far away from the edges and the thin plate subjected to any transverse loadings.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001494012
|
oai_dc
|
Mode-by-mode evaluation of structural systems using a bandpass-HHT filtering approach
|
Mode-by-mode evaluation of structural systems using a bandpass-HHT filtering approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jeng-Wen Lin(Feng Chia University)"
] |
This paper presents an improved version of the Hilbert-Huang transform (HHT) for the modal evaluation of structural systems or signals. In this improved HHT, a well-designed bandpass filter is used as preprocessing to separate and determine each mode of the signal for solving the inherent modemixing problem in HHT (i.e., empirical mode decomposition, EMD, associated with the Hilbert transform). A screening process is then applied to remove undesired intrinsic mode functions (IMFs) derived from the EMD of the signal’s mode. A “best” IMF is selected in each screening process that utilizes the orthogonalization coefficient between the signal’s mode and its IMFs. Through mode-by-mode signal filtering, parameters such as the modal frequency can be evaluated accurately when compared to the theoretical value. Time history of the identified modal frequency is available. Numerical results prove the efficiency of the proposed approach, showing relative errors 1.40%, 2.06%, and 1.46%, respectively, for the test cases of a benchmark structure in the lab, a simulated time-varying structural system, and of a linear superimposed cosine waves.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001545609
|
oai_dc
|
Structural design using topology and shape optimization
|
Structural design using topology and shape optimization
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Eun-Hyung Lee(Dankook University); 박재균(Dankook University)"
] |
A topology optimization and shape optimization method are widely used in the design area of engineering field. In this paper, a unified procedure to combine both topology and shape optimization method is used. A material distribution method is used first to extract necessary design parameters of the structure and a shape optimization scheme using genetic algorithm and satisfying all the condition follows. As an example, a GFRP bridge deck is designed and compared with other commercial products. The performance of the designed deck shows that the used design procedure is very efficient and safe. This procedure can be generalized for using in other areas of engineering.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001545592
|
oai_dc
|
Recovering missing data transmitted from a wireless sensor node for vibration-based bridge health monitoring
|
Recovering missing data transmitted from a wireless sensor node for vibration-based bridge health monitoring
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C.W. Kim(Kyoto University); M. Kawatani(Kobe University); R. Ozaki(Kobe University); N. Makihata(JIP Techno Science Corporation)"
] |
This paper presents recovering of missing vibration data of a bridge transmitted from wireless sensors. Kalman filter algorithm is adopted to reconstruct the missing data analytically. Validity of the analytical approach is examined through a field experiment of a bridge. Observations demonstrate that, even a part of recovered acceleration responses is underestimated in comparison with those responses taken from cabled sensors, dominant frequencies taken from the reconstructed data are comparable with those from cabled sensors.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001545607
|
oai_dc
|
A homogenization approach for uncertainty quantification of deflection in reinforced concrete beams considering microstructural variability
|
A homogenization approach for uncertainty quantification of deflection in reinforced concrete beams considering microstructural variability
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김정중(경남대학교); Tai Fan(University of New Mexico); Mahmoud M. Reda Taha(University of New Mexico)"
] |
Uncertainty in concrete properties, including concrete modulus of elasticity and modulus of rupture, are predicted by developing a microstructural homogenization model. The homogenization model is developed by analyzing a concrete representative volume element (RVE) using the finite element (FE)method. The concrete RVE considers concrete as a three phase composite material including: cement paste, aggregate and interfacial transition zone (ITZ). The homogenization model allows for considering two sources of variability in concrete, randomly dispersed aggregates in the concrete matrix and uncertain mechanical properties of composite phases of concrete. Using the proposed homogenization technique, the uncertainty in concrete modulus of elasticity and modulus of rupture (described by numerical cumulative probability density function) are determined. Deflection uncertainty of reinforced concrete (RC) beams, propagated from uncertainties in concrete properties, is quantified using Monte Carlo (MC) simulation. Cracked plane frame analysis is used to account for tension stiffening in concrete. Concrete homogenization enables a unique opportunity to bridge the gap between concrete materials and structural modeling, which is necessary for realistic serviceability prediction.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001545610
|
oai_dc
|
A method of global-local analyses of structures involving local heterogeneities and propagating cracks
|
A method of global-local analyses of structures involving local heterogeneities and propagating cracks
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mao Kurumatani(Ibaraki University); Kenjiro Terada(Tohoku University)"
] |
This paper presents the global-local finite cover method (GL-FCM) that is capable of analyzing structures involving local heterogeneities and propagating cracks. The suggested method is composed of two techniques. One of them is the FCM, which is one of the PU-based generalized finite element methods, for the analysis of local cohesive crack growth. The mechanical behavior evaluated in local heterogeneous structures by the FCM is transferred to the overall (global) structure by the so-called mortar method. The other is a method of mesh superposition for hierarchical modeling, which enables us to evaluate the average stiffness by the analysis of local heterogeneous structures not subjected to crack propagation. Several numerical experiments are conducted to validate the accuracy of the proposed method. The capability and applicability of the proposed method is demonstrated in an illustrative numerical example, in which we predict the mechanical deterioration of a reinforced concrete (RC) structure, whose local regions are subjected to propagating cracks induced by reinforcement corrosion.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001545606
|
oai_dc
|
Debonding failure analysis of FRP-retrofitted concrete panel under blast loading
|
Debonding failure analysis of FRP-retrofitted concrete panel under blast loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ho Jin Kim(ATMACS Co. Ltd.); 이나현(연세대학교); 김성배(연세대학교); Jin Won Nam(Southern University); Ju Hyung Ha(Yonsei University); 김장호(연세대학교)"
] |
Even though fiber reinforced polymer (FRP) has been widely used as a retrofitting material, the FRP behavior and effect in FRP retrofitted structure under blast loading, impulsive loading with instantaneous time duration, has not been accurately examined. The past studies have focused on the performance of FRP retrofitted structures by making simplifications in modeling, without incorporating accurate failure mechanisms of FRP. Therefore, it is critical to establish an analytical model that can properly consider the specific features of FRP material in evaluating the response of retrofitted concrete structures under blast loading. In this study, debonding failure analysis technique for FRP retrofitted concrete structure under blast loading is suggested by considering FRP material characteristics and debonding failure mechanisms as well as rate dependent failure mechanism based on a blast resisting design concept. In addition, blast simulation of FRP retrofitted RC panel is performed to validate the proposed model and analysis method. For validation of the proposed model and analysis method, the reported experimental results are compared with the debonding failure analysis results. From the comparative verification, it is confirmed that the proposed analytical model considering debonding failure of FRP is able to reasonably predict the behavior of FRP retrofitted concrete panel under blast loading.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001545588
|
oai_dc
|
Behavior of continuous RC deep girders that support walls with long end shear spans
|
Behavior of continuous RC deep girders that support walls with long end shear spans
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이한선(고려대학교); 고동우(제주대학교); Sung-Min Sun(Hyundai Engineering Co. Ltd.)"
] |
Continuous deep girders which transmit the gravity load from the upper wall to the lower columns have frequently long end shear spans between the boundary of the upper wall and the face of the lower column. This paper presents the results of tests and analyses performed on three 1:2.5 scale specimens with long end shear spans, (the ratios of shear-span/total depth: 1.8 < a/h < 2.5): one designed by the conventional approach using the beam theory and two by the strut-and-tie approach. The conclusions are as follows: (1) the yielding strength of the continuous RC deep girders is controlled by the tensile yielding of the bottom longitudinal reinforcements, being much larger than the nominal strength predicted by using the section analysis of the girder section only or using the strut-and-tie model based on elastic-analysis stress distribution. (2) The ultimate strengths are 22% to 26% larger than the yielding strength. This additional strength derives from the strain hardening of yielded reinforcements and the shear resistance due to continuity with the adjacent span. (3) The pattern of shear force flow and failure mode in shear zone varies depending on the amount of vertical shear reinforcement. And (4) it is necessary to take into account the existence of the upper wall in the analysis and design of the deep continuous transfer girders that support the upper wall with a long end shear span.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001545602
|
oai_dc
|
Flexural behavior of concrete beams reinforced with aramid fiber reinforced polymer (AFRP) bars
|
Flexural behavior of concrete beams reinforced with aramid fiber reinforced polymer (AFRP) bars
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김민숙(경희대학교); 이영학(경희대학교); 김희철(경희대학교); Andrew Scanlon(The Pennsylvania State University); 이준복(Kyung Hee University)"
] |
Due to the low elastic modulus of FRP, concrete members reinforced with FRP rebars show greater deflections than members reinforced with steel rebars. Deflection is one of the important factors to consider the serviceability of horizontal members. In this study flexural test of AFRP reinforced concrete beams was performed considering reinforcement ratio and compressive strength as parameters. The test results indicated that flexural capacity and stiffness increase in proportion to the reinforcement ratio. The test results were compared with existing proposed equations for the effective moment of inertia including ACI 440. The most of the proposed equations were found to over-estimate the effective moment of inertia while the equation proposed by Bischoff and Scanlon (2007) most accurately predicted the values obtained through actual testing.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001545599
|
oai_dc
|
Fatigue life prediction of multiple site damage based on probabilistic equivalent initial flaw model
|
Fatigue life prediction of multiple site damage based on probabilistic equivalent initial flaw model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김정훈(한국가스안전공사); 지광습(고려대학교); Son-Nguyen Van(Korea University); MinChul Jeong(Korea University); JungSik Kong(Korea University); Minsung Kim(Agency for Defense Development)"
] |
The loss of strength in a structure as a result of cyclic loads over a period of life time is an important phenomenon for the life-cycle analysis. Service loads are accentuated at the areas of stress concentration, mainly at the connection of components. Structural components unavoidably are affected by defects such as surface scratches, surface roughness and weld defects of random sizes, which usually occur during the manufacturing and handling process. These defects are shown to have an important effect on the fatigue life of the structural components by promoting crack initiation sites. The value of equivalent initial flaw size (EIFS) is calculated by using the back extrapolation technique and the Paris law of fatigue crack growth from results of fatigue tests. We try to analyze the effect of EIFS distribution in a multiple site damage (MSD) specimen by using the extended finite element method (XFEM). For the analysis, fatigue tests were conducted on the centrally-cracked specimens and MSD specimens.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001545596
|
oai_dc
|
The transient and frequency response analysis using the multi-level system condensation in the large-scaled structural dynamic problem
|
The transient and frequency response analysis using the multi-level system condensation in the large-scaled structural dynamic problem
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sungmin Baek(Seoul National University); 조맹효(서울대학교)"
] |
In large-scale problem, a huge size of computational resources is needed for a reliable solution which represents the detailed description of dynamic behavior. Recently, eigenvalue reduction schemes have been considered as important technique to resolve computational resource problems. In addition, the efforts to advance an efficiency of reduction scheme leads to the development of the multilevel system condensation (MLSC) which is initially based on the two-level condensation scheme (TLCS). This scheme was proposed for approximating the lower eigenmodes which represent the global behavior of the structures through the element-level energy estimation. The MLSC combines the multi-level substructuring scheme with the previous TLCS for enhancement of efficiency which is related to computer memory and computing time. The present study focuses on the implementation of the MLSC on the direct time response analysis and the frequency response analysis of structural dynamic problems. For the transient time response analysis, the MLSC is combined with the Newmark’s time integration scheme.
Numerical examples demonstrate the efficiency of the proposed method.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001545589
|
oai_dc
|
A two-level parallel algorithm for material nonlinearity problems
|
A two-level parallel algorithm for material nonlinearity problems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이지호(Dongguk University-Seoul); Min Seok Kim(Dongguk University-Seoul)"
] |
An efficient two-level domain decomposition parallel algorithm is suggested to solve large-DOF structural problems with nonlinear material models generating unsymmetric tangent matrices, such as a group of plastic-damage material models. The parallel version of the stabilized bi-conjugate gradient method is developed to solve unsymmetric coarse problems iteratively. In the present approach the coarse DOF system is solved parallelly on each processor rather than the whole system equation to minimize the data communication between processors, which is appropriate to maintain the computing performance on a non-supercomputer level cluster system. The performance test results show that the suggested algorithm provides scalability on computing performance and an efficient approach to solve large-DOF nonlinear structural problems on a cluster system.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001487479
|
oai_dc
|
Seismic response of concrete gravity dam-ice covered reservoir-foundation interaction systems
|
Seismic response of concrete gravity dam-ice covered reservoir-foundation interaction systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K. Haciefendioglu(Ondokuz May s University); A. Bayraktar(Ondokuz May s University); T. Türker(Karadeniz Technical University)"
] |
This paper examines the ice cover effects on the seismic response of concrete gravity damreservoir-foundation interaction systems subjected to a horizontal earthquake ground motion. ANSYS program is used for finite element modeling and analyzing the ice-dam-reservoir-foundation interaction system. The ice-dam-reservoir interaction system is considered by using the Lagrangian (displacementbased) fluid and solid-quadrilateral-isoparametric finite elements. The Sar yar concrete gravity dam in Turkey is selected as a numerical application. The east-west component of Erzincan earthquake, which occurred on 13 March 1992 in Erzincan, Turkey, is selected for the earthquake analysis of the dam. Dynamic analyses of the dam-reservoir-foundation interaction system are performed with and without ice cover separately. Parametric studies are done to show the effects of the variation of the length, thickness, elasticity modulus and density of the ice-cover on the seismic response of the dam. It is observed that the variations of the length, thickness, and elasticity modulus of the ice-cover influence the displacements and stresses of the coupled system considerably. Also, the variation of the density of the ice-cover cannot produce important effects on the seismic response of the dam.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001487475
|
oai_dc
|
Nonlinear analysis of 3D reinforced concrete frames: effect of section torsion on the global response
|
Nonlinear analysis of 3D reinforced concrete frames: effect of section torsion on the global response
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hamid R. Valipour(University of Technology (UTS)); Stephen J. Foster(The University of New South Wales (UNSW))"
] |
In this paper the formulation of an efficient frame element applicable for nonlinear analysis of 3D reinforced concrete (RC) frames is outlined. Interaction between axial force and bending moment is considered by using the fibre element approach. Further, section warping, effect of normal and tangential forces on the torsional stiffness of section and second order geometrical nonlinearities are included in the model. The developed computer code is employed for nonlinear static analysis of RC sub-assemblages and a simple approach for extending the formulation to dynamic cases is presented. Dynamic progressive collapse assessment of RC space frames based on the alternate path method is undertaken and dynamic load factor (DLF) is estimated. Further, it is concluded that the torsional behaviour of reinforced concrete elements satisfying minimum standard requirements is not significant for the framed structures studied.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001487474
|
oai_dc
|
Coupled thermal and structural analysis of roller compacted concrete arch dam by three-dimensional finite element method
|
Coupled thermal and structural analysis of roller compacted concrete arch dam by three-dimensional finite element method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Khaled H. Bayagoob(Universiti Putra Malaysia); Jamaloddin Noorzaei(Universiti Putra Malaysia); A. Abdulrazeg(Universiti Putra Malaysia); Awad A. Al-Karni(King Saud University); Mohd Saleh Jaafar(Universiti Putra Malaysia)"
] |
This paper focuses on the development, verification and application of a three-dimensional nite element code for coupled thermal and structural analysis of roller compacted concrete arch dams. The Ostour Arch dam located on Ghezel-Ozan River, Iran, which was originally designed as conventional concrete arch dam, has been taken for the purpose of verication of the nite element code. In this project, RCC technology has been ascertained as an alternative method to reduce the cost of the project and make it competitive. The thermal analysis has been carried out taking into account the simulation of the sequence of construction, environmental temperature changes, and the wind speed. In addition, the variation of elastic modulus with time has been considered in this investigation using Concard’s model. An attempt was made to compare the stresses developed in the dam body five years after the completion of the dam with those of end of the construction. It was seen that there is an increase in the tensile stresses after five years over stresses obtained immediately at the end of construction by 61.3%.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001487476
|
oai_dc
|
Effects of tensile softening on the cracking resistance of FRP reinforced concrete under thermal loads
|
Effects of tensile softening on the cracking resistance of FRP reinforced concrete under thermal loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Pattamad Panedpojaman(Chulalongkorn University); Thanyawat Pothisiri(Chulalongkorn University)"
] |
Fiber reinforced polymer (FRP) bars have been widely used as reinforcement for concrete structures. However, under elevated temperatures, the difference between the transverse coefficients of thermal expansion of FRP rebars and concrete may cause the splitting cracks of the concrete cover. As a result, the bonding of FRP-reinforced concrete may not sustain its function to transfer load between the FRP rebar and the surrounding concrete. The current study investigates the cracking resistance of FRP reinforced concrete against the thermal expansion based on a mechanical model that accounts for the tensile softening behavior of concrete. To evaluate the efficacy of the proposed model, the critical temperature increments at which the splitting failure of the concrete cover occurs and the internal crack radii estimated are compared with the results obtained from the previous studies. Simplified equations for estimating the critical temperature increments and the minimum concrete cover required to prevent concrete splitting failure for a designated temperature increment are also derived for design purpose.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001487477
|
oai_dc
|
Dynamic reliability of structures: the example of multi-grid composite walls
|
Dynamic reliability of structures: the example of multi-grid composite walls
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Pei Liu(Beijing Jiaotong University); Qian-Feng Yao(Beijing Jiaotong University)"
] |
Based on damage accumulation of multi-grid composite walls, a method of dynamic reliability estimations is proposed. The multi-grid composite wall is composed of edge frame beam, edge frame columns, grid beams, grid columns and filling blocks. The equations including stiffness, shear forces at filling blocks cracking and multi-grid composite walls yielding, ultimate displacement, and damage index are obtained through tests of 13 multi-grid composite wall specimens. Employing these equations in reliability calculations, procedures of dynamic reliability estimations based on damage accumulation of multi-grid composite walls subjected to random earthquake excitations are proposed. Finally the proposed method is applied to the typical composite wall specimen subjected to random earthquake excitations which can be specified by a finite number of input random variables. The dynamic reliability estimates, when filling blocks crack under earthquakes corresponding to 63% exceedance in 50 years and when the composite wall reach limit state under earthquakes corresponding to 2-3% exceedance in 50 years, are obtained using the proposed method by taking damage indexes as thresholds. The results from the proposed method which show good agreement with those from Monte-Carlo simulations demonstrate the proposed method is effective.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001487480
|
oai_dc
|
Structural analysis of high-rise reinforced concrete building structures during construction
|
Structural analysis of high-rise reinforced concrete building structures during construction
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiaobin Song(Tongji University); Xianglin Gu(Tongji University); Weiping Zhang(Tongji University); Tingshen Zhao(Huazhong University of Science and Technology); Xianyu Jin(Zhejiang University)"
] |
This paper presents a three-dimensional finite element method based structural analysis model for structural analysis of reinforced concrete high-rise buildings during construction. The model considered the time-dependency of the structural configuration and material properties as well as the effect of the construction rate and shoring stiffness. Uniaxial compression tests of young concrete within 28 days of age were conducted to establish the time-dependent compressive stress-strain relationship of concrete,which was then used as input parameters to the structural analysis model. In-situ tests of a RC high-rise building were conducted, the results of which were used for model verification. Good agreement between the test results and model predictions was achieved. At the end, a parametric study was conducted using the verified model. The results indicated that the floor position and construction rate had significant effect on the shore load, whereas the influence of the shore removal timing and shore stiffness have much smaller. It was also found that the floors are more prone to cracking during construction than is ultimate bending failure.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001487478
|
oai_dc
|
Numerical simulation of shaking table test on concrete gravity dam using plastic damage model
|
Numerical simulation of shaking table test on concrete gravity dam using plastic damage model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"B. Phansri(Asian Institute of Technology); S. Charoenwongmit(Asian Institute of Technology); P. Warnitchai(Asian Institute of Technology); D.H. Shin(Korea Water Resources Corporation); K.H. Park(Asian Institute of Technology)"
] |
The shaking table tests were conducted on two small-scale models (Model 1 and Model 2) to examine the earthquake-induced damage of a concrete gravity dam, which has been planned for the construction with the recommendation of the peak ground acceleration of the maximum credible earthquake of 0.42 g. This study deals with the numerical simulation of shaking table tests for two smallscale dam models. The plastic damage constitutive model is used to simulate the crack/damage behavior of the bentonite-concrete mixture material. The numerical results of the maximum failure acceleration and the crack/damage propagation are compared with experimental results. Numerical results of Model 1 showed similar crack/damage propagation pattern with experimental results, while for Model 2 the similar pattern was obtained by considering the modulus of elasticity of the first and second natural frequencies. The crack/damage initiated at the changing point in the downstream side and then propagated toward the upstream side. Crack/damage accumulation occurred in the neck area at acceleration amplitudes of around 0.55 g~0.60 g and 0.65 g~0.675 g for Model 1 and Model 2, respectively.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001444829
|
oai_dc
|
Nonlinear behavior of concrete gravity dams and effect of input spatially variation
|
Nonlinear behavior of concrete gravity dams and effect of input spatially variation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. Mirzabozorg(KN-Toosi University of Technology); R. Kianoush(Ryerson University); M. Varmazyari(KN-Toosi University of Technology)"
] |
In the present article, effect of non-uniform excitation due to spatially variation of seismic input on nonlinear response of concrete gravity dams is considered. The reservoir is assumed compressible. Isotropic damage mechanics approach is used to model static and dynamic nonlinear behavior of mass concrete in 2D space. The validity of utilized nonlinear model is considered using available theoretical results under static and dynamic conditions. The tallest monolith of Pine Flat dam is selected as a case study. Two cases are analyzed for considering the effect of limited wave propagation velocity on seismic behavior of the dam-reservoir system in which travelling velocities are chosen as 2000 m/s and infinity. It is found that tensile damage in neck and toe regions and also, in the vicinity of the base increase when the system is excited non-uniformly.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001444832
|
oai_dc
|
Force and stress for electromechanical integrated toroidal drive
|
Force and stress for electromechanical integrated toroidal drive
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lizhong Xu(Yanshan University); Jin Huang(Yanshan University)"
] |
토목공학
| null |
kci_detailed_000078.xml
|
||||
ART001444825
|
oai_dc
|
Nonlinear finite element analysis of circular concrete-filled steel tube structures
|
Nonlinear finite element analysis of circular concrete-filled steel tube structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tengfei Xu(Southwest Jiaotong University); Tianyu Xiang(Southwest Jiaotong University); Renda Zhao(Southwest Jiaotong University); Yulin Zhan(Southwest Jiaotong University)"
] |
The structural behaviors of circular concrete filled steel tube (CFT) structures are investigated by nonlinear finite element method. An efficient three-dimensional (3D) degenerated beam element is adopted. Based on those previous studies, a modified stress-strain relationship for confined concrete which introduces the influence of eccentricity on confining stress is presented. Updated Lagrange formulation is used to consider the geometrical nonlinearity induced by large deformation effect. The nonlinear behaviors of CFT structures are investigated, and the accuracy of the proposed constitutive model for confined concrete is mainly concerned. The results demonstrate that the confining effect in CFT elements subjected to combining action of axial force and bending moment is far sophisticated than that in axial loaded columns, and an appropriate evaluation about this effect may be important for nonlinear numerical simulation of CFT structures.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001444824
|
oai_dc
|
Dynamic testing of a soil-steel bridge
|
Dynamic testing of a soil-steel bridge
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Damian Beben(Opole University of Technology); Zbigniew Manko(Wroclaw University of Environmental and Life Science)"
] |
The paper presents the results and conclusions of dynamic load tests that were conducted on a road bridge over the Mokrzyca river in Wroclaw (Poland) made of galvanized corrugated steel plates (CSP). The critical speed magnitudes, velocity vibration, vibration frequency were determined in the paper. The dynamic analysis is extremely important, because such studies of soil-steel bridges in the range of dynamic loads are relatively seldom conducted. Conclusions drawn from the tests can be most helpful in the assessment of behaviour of this type of corrugated plate bridge with soil. In consideration of application of this type of structure in the case of small-to-medium span bridges, the conclusions from the research will not be yet generalized to all types of such solutions. The detailed reference to all type of such bridge structures would be requiring additional analysis (field tests and calculations) on the other types of soil-steel bridges.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001444823
|
oai_dc
|
Finite element procedures for the numerical simulation of fatigue crack propagation under mixed mode loading
|
Finite element procedures for the numerical simulation of fatigue crack propagation under mixed mode loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Abdulnaser M. Alshoaibi(Jazan University)"
] |
This paper addresses the numerical simulation of fatigue crack growth in arbitrary 2D geometries under constant amplitude loading by the using a new finite element software. The purpose of this software is on the determination of 2D crack paths and surfaces as well as on the evaluation of components Lifetimes as a part of the damage tolerant assessment. Throughout the simulation of fatigue crack propagation an automatic adaptive mesh is carried out in the vicinity of the crack front nodes and in the elements which represent the higher stresses distribution. The fatigue crack direction and the corresponding stress-intensity factors are estimated at each small crack increment by employing the displacement extrapolation technique under facilitation of singular crack tip elements. The propagation is modeled by successive linear extensions, which are determined by the stress intensity factors under linear elastic fracture mechanics (LEFM) assumption. The stress intensity factors range history must be recorded along the small crack increments. Upon completion of the stress intensity factors range history recording, fatigue crack propagation life of the examined specimen is predicted. A consistent transfer algorithm and a crack relaxation method are proposed and implemented for this purpose. Verification of the predicted fatigue life is validated with relevant experimental data and numerical results obtained by other researchers. The comparisons show that the program is capable of demonstrating the fatigue life prediction results as well as the fatigue crack path satisfactorily.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001444822
|
oai_dc
|
Investigation into shear properties of medium strength reinforced concrete beams
|
Investigation into shear properties of medium strength reinforced concrete beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Attaullah Shah(Allama Iqbal Open University Islamabad-Pakistan); Saeed Ahmad(University of Engineering and Technology); Salimullah Khan(Hazara University Mansehra)"
] |
The shear contribution of transverse steel in reinforced concrete beams is generally assumed as independent of the concrete strength by most of the building codes. The shear strength of RC beams with web reinforcement is worked out by adding the individual contributions of concrete and stirrups. In this research 70 beams of medium strength concrete in the range of 52-54 MPa, compressive strength were tested in two sets of 35 beams each. In one set of 35 beams no web reinforcement was used, whereas in second set of 35 beams web reinforcement was used to check the contribution of stirrups. The values have also been compared with the provisions of ACI, Eurocode and Japanese Code building codes. The results of two sets of beams, when compared mutually and provisions of the building codes, showed that the shear strength of beams has been increased with the addition of stirrups for all the beams, but the increase is non uniform and irregular. The comparison of observed values with the provisions of selected codes has shown that EC-02 is relatively less conservative for low values of longitudinal steel, whereas ACI-318 overestimates the shear strength of RC beams at higher values of longitudinal steel. The Japanese code of JSCE has given relatively good results for the beams studied.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001444827
|
oai_dc
|
Analysis of impact response and damage in laminated composite cylindrical shells undergoing large deformations
|
Analysis of impact response and damage in laminated composite cylindrical shells undergoing large deformations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Surendra Kumar(CSIR Centre for Mathematical Modelling and Computer Simulation)"
] |
The impact behaviour and the impact-induced damage in laminated composite cylindrical shell subjected to transverse impact by a foreign object are studied using three-dimensional non-linear transient dynamic finite element formulation. A layered version of 20 noded hexahedral element incorporating geometrical non-linearity is developed based on total Langragian approach. Non-linear system of equations resulting from non-linear strain displacement relation and non-linear contact loading are solved using Newton-Raphson incremental-iterative method. Some example problems of graphite/epoxy cylindrical shell panels are considered with variation of impactor and laminate parameters and influence of geometrical non-linear effect on the impact response and the resulting damage is investigated.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001444826
|
oai_dc
|
Cutout shape and size effects on response of quasi-isotropic composite laminate under uni-axial compression
|
Cutout shape and size effects on response of quasi-isotropic composite laminate under uni-axial compression
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.B. Singh(Birla Institute of Technology and Science); Dinesh Kumar(Birla Institute of Technology and Science)"
] |
Cutouts are often provided in structural and aircraft components for ventilation, for access, inspection, electric lines and fuel lines or sometimes to lighten the structure. This paper addresses the effects of cutout shape (i.e., circular, square, diamond, elliptical-vertical and elliptical-horizontal) and size on buckling and postbuckling response of quasi-isotropic (i.e., (+45/−45/0/90)2s) composite laminate under uni-axial compression. The finite element method is used to carry out the investigation. The formulation is based on first order shear deformation theory and von Karman’s assumptions are used to incorporate geometric nonlinearity. The 3-D Tsai-Hill criterion is used to predict the failure of a lamina while the onset of delamination is predicted by the interlaminar failure criterion. It is observed that for the smaller size cutout area there is no significant effect of cutout shape on load-deflection response of the laminate. It is also concluded that the cutout size has substantial influence on the buckling and postbuckling response of the laminate with elliptical-horizontal cutout, while this effect is observed to be the least in case of laminate with elliptical-vertical cutout.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001444830
|
oai_dc
|
Dynamic behavior of infinite beams resting on elastic foundation under the action of moving loads
|
Dynamic behavior of infinite beams resting on elastic foundation under the action of moving loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ioannis G. Raftoyiannis(National Technical University of Athens); Tassos P. Avraam(National Technical University of Athens); George T. Michaltsos(National Technical University of Athens)"
] |
토목공학
| null |
kci_detailed_000078.xml
|
||||
ART001521395
|
oai_dc
|
Three-dimensional free vibration analysis of functionally graded fiber reinforced cylindrical panels using differential quadrature method
|
Three-dimensional free vibration analysis of functionally graded fiber reinforced cylindrical panels using differential quadrature method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.H. Yas(Razi University); B. Sobhani Aragh(Razi University); M. Heshmati(Razi University)"
] |
Three dimensional solutions for free vibrations analysis of functionally graded fiber reinforced cylindrical panel are presented, using differential quadrature method (DQM). The orthotropic panel is simply supported at the edges and is assumed to have an arbitrary variation of reinforcement volume fraction in the radial direction. Suitable displacement functions that identically satisfy the simply supported boundary condition are used to reduce the equilibrium equations to a set of coupled ordinary differential equations with variable coefficients, which can be solved by differential quadrature method to obtain natural frequencies. The main contribution of this work is presenting useful results for continuous grading of fiber reinforcement in the thickness direction of a cylindrical panel and comparison with similar discrete laminate composite ones. Results indicate that significant improvement is found in natural frequency of a functionally graded fiber reinforced composite panel due to the reduction in spatial mismatch of material properties.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001521384
|
oai_dc
|
Finite element analysis of concrete cracking at early age
|
Finite element analysis of concrete cracking at early age
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mauren Aurich(Pontifical Catholic University); Américo Campos Filho(Pontifical Catholic University); Túlio Nogueira Bittencourt(University of São Paulo); Surendra P. Shah(Northwestern University)"
] |
The study of the early age concrete properties is becoming more important, as the thermal effects and the shrinkage, even in the first hours, could generate cracks, increasing the permeability of the structure and being able to induce problems of durability and functionality in the same ones. The detailed study of the stresses development during the construction process can be decisive to keep low the cracking levels. In this work a computational model, based on the finite element method, was implemented to simulate the early age concrete behavior and, specially, the evaluation of the cracking risk. The finite element analysis encloses the computational modeling of the following phenomena: chemical, thermal, moisture diffusion and mechanical which occur at the first days after the concrete cast. The developed software results were compared with experimental values found in the literature, demonstrating an excellent approach for all the implemented analysis.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001521400
|
oai_dc
|
Investigation on efficiency and applicability of subspace iteration method with accelerated starting vectors for calculating natural modes of structures
|
Investigation on efficiency and applicability of subspace iteration method with accelerated starting vectors for calculating natural modes of structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"B.W. Kim(KORDI/MOERI); 정형조(한국과학기술원); S.Y. Hong(KORDI/MOERI)"
] |
For efficient calculation of natural modes of structures, a numerical scheme which accelerates convergence of the subspace iteration method by employing accelerated starting Lanczos vectors was proposed in 2005. This paper is an extension of the study. The previous study simply showed feasibility of the proposed method by analyzing structures with smaller degrees of freedom. While, the present study verifies efficiency of the proposed method more rigorously by comparing closeness of conventional and accelerated starting vectors to genuine eigenvectors. This study also analyzes an example structure with larger degrees of freedom and more complex constraints in order to investigate applicability of the proposed method.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001521392
|
oai_dc
|
Dynamic buckling analysis of a composite stiffened cylindrical shell
|
Dynamic buckling analysis of a composite stiffened cylindrical shell
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.N. Patel(Politecnico di Milano); C. Bisagni(Politecnico di Milano); P.K. Datta(Indian Institute of Technology)"
] |
The paper investigates the dynamic buckling behaviour of a laminated composite stiffened cylindrical shell using the commercial finite element code ABAQUS. The numerical model of the composite shell is validated by static tests. In particular, the experimental collapse test is numerically simulated by a quasi static analysis carried out by both ABAQUS/Standard and ABAQUS/Explicit. The behaviour in the post-buckling field and the collapse load obtained by the analyses are close to the experimental data. The validated model is then used to study the dynamic buckling behaviour with ABAQUS/Explicit. The effects of the loading magnitude and of the loading duration are investigated, implementing in the analysis also first-ply failure criteria. It is observed that the dynamic buckling load is highly affected by the loading duration.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001521389
|
oai_dc
|
Dynamic response of a Timoshenko beam on a tensionless Pasternak foundation
|
Dynamic response of a Timoshenko beam on a tensionless Pasternak foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Irfan Coskun(Yildiz Technical University); Hasan Engin(Istanbul Technical University); Ayfer Tekin(Yildiz Technical University)"
] |
The dynamic response of a Timoshenko beam on a tensionless Pasternak foundation is investigated by assuming that the beam is subjected to a concentrated harmonic load at its middle. This action results in the creation of lift-off regions between the beam and the foundation that effect the character of the response. Although small displacements for the beam and the foundation are assumed, the problem becomes nonlinear since the contact/lift-off regions are not known at the outset. The governing equations of the beam, which are coupled in deflection and rotation, are obtained in both the contact and lift-off regions. After removing the coupling, the essentials of the problem (the contact regions) are determined by using an analytical-numerical method. The results are presented in figures to demonstrate the effects of some parameters on the extent of the contact lengths and displacements. The results are also compared with those of Bernoulli-Euler, shear, and Rayleigh beams. It is observed that the solution is not unique; for a fixed value of the frequency parameter, more than one solution (contact length) exists. The contact length of the beam increases with the increase of the frequency and rotary-inertia parameters, whereas it decreases with increasing shear foundation parameter.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001521397
|
oai_dc
|
Optimization of trusses under uncertainties with harmony search
|
Optimization of trusses under uncertainties with harmony search
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vedat Togan(Karadeniz Technical University); Ayse T. Daloglu(Karadeniz Technical University); Halil Karadeniz(Delft University of Technology)"
] |
In structural engineering there are randomness inherently exist on determination of the loads, strength, geometry, and so on, and the manufacturing of the structural members, workmanship etc. Thus, objective and constraint functions of the optimization problem are functions that depend on those randomly natured components. The constraints being the function of the random variables are evaluated by using reliability index or performance measure approaches in the optimization process. In this study, the minimum weight of a space truss is obtained under the uncertainties on the load, material and crosssection areas with harmony search using reliability index and performance measure approaches. Consequently, optimization algorithm produces the same result when both the approaches converge. Performance measure approach, however, is more efficient compare to reliability index approach in terms of the convergence rate and iterations needed.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001521386
|
oai_dc
|
A topological optimization method for flexible multi-body dynamic system using epsilon algorithm
|
A topological optimization method for flexible multi-body dynamic system using epsilon algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhi-Jun Yang(Guangdong University of Technology); Xin Chen(Guangdong University of Technology); Robert Kelly(Guangdong University of Technology)"
] |
In a flexible multi-body dynamic system the typical topological optimization method for structures cannot be directly applied, as the stiffness varies with position. In this paper, the topological optimization of the flexible multi-body dynamic system is converted into structural optimization using the equivalent static load method. First, the actual boundary conditions of the control system and the approximate stiffness curve of the mechanism are obtained from a flexible multi-body dynamical simulation. Second, the finite element models are built using the absolute nodal coordination for different positions according to the stiffness curve. For efficiency, the static reanalysis method is utilized to solve these finite element equilibrium equations. Specifically, the finite element equilibrium equations of key points in the stiffness curve are fully solved as the initia solution, and the following equilibrium equations are solved using a reanalysis method with an error controlled epsilon algorithm. In order to identify the efficiency of the elements, a non-dimensional measurement is introduced. Finally, an improved evolutional structural optimization (ESO) method is used to solve the optimization problem. The presented method is applied to the optimal design of a die bonder. The numerical results show that the presented method is practical and efficient when optimizing the design of the mechanism.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465465
|
oai_dc
|
Influence of cable loosening on nonlinear parametric vibrations of inclined cables
|
Influence of cable loosening on nonlinear parametric vibrations of inclined cables
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Qingxiong Wu(Fuzhou University); Kazuo Takahashi(Nagasaki University); Baochun Chen(Fuzhou University)"
] |
The effect of cable loosening on the nonlinear parametric vibrations of inclined cables is discussed in this paper. In order to overcome the small-sag limitation in calculating loosening for inclined cables, it is necessary to first derive equations of motion for an inclined cable. Using these equations and the finite difference method, the effect of cable loosening on the nonlinear parametric response of inclined cables under periodic support excitation is evaluated. A new technique that takes into account flexural rigidity and damping is proposed as a solution to solve the problem of divergence. The regions of inclined cables that undergo compression are also indicated.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465463
|
oai_dc
|
A decoupling FEM for simulating near-field wave motion in two-phase media
|
A decoupling FEM for simulating near-field wave motion in two-phase media
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. L. Chen(Nanjing University of Aeronautics and Astronautics); Z. P. Liao(Institute of Engineering Mechanics); J. Chen(Shanghai Jiao Tong University)"
] |
A decoupling technique for simulating near-field wave motions in two-phase media is introduced in this paper. First, an equivalent but direct weighted residual method is presented in this paper to solve boundary value problems more explicitly. We applied the Green’s theorem for integration by parts
on the equivalent integral statement of the field governing equations and then introduced the Neumann conditions directly. Using this method and considering the precision requirement in wave motion simulation, a lumped-mass FEM for two-phase media with clear physical concepts and convenient
implementation is derived. Then, considering the innate attenuation character of the wave in two-phase media, an attenuation parameter is introduced into Liao’s Multi-Transmitting Formula (MTF) to simulate the attenuating outgoing wave in two-phase media. At last, two numerical experiments are presented and the numerical results are compared with the analytical ones demonstrating that the lumped-mass FEM and the generalized MTF introduced in this paper have good precision.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465464
|
oai_dc
|
Nonlinear dynamic response of MDOF systems by the method of harmonic differential quadrature (HDQ)
|
Nonlinear dynamic response of MDOF systems by the method of harmonic differential quadrature (HDQ)
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ömer Civalek(Akdeniz University)"
] |
A harmonic type differential quadrature approach for nonlinear dynamic analysis of multidegree-of-freedom systems has been developed. A series of numerical examples is conducted to assess the performance of the HDQ method in linear and nonlinear dynamic analysis problems. Results are
compared with the existing solutions available from other analytical and numerical methods. In all cases, the results obtained are quite accurate.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465467
|
oai_dc
|
Effects of element distortions on the performance of enriched quadrilateral elements
|
Effects of element distortions on the performance of enriched quadrilateral elements
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shi-Pin Ho(National Cheng Kung University); Yen-Liang Yeh(National Cheng Kung University)"
] |
토목공학
| null |
kci_detailed_000078.xml
|
||||
ART001465466
|
oai_dc
|
Optimal stacking sequence design of laminate composite structures using tabu embedded simulated annealing
|
Optimal stacking sequence design of laminate composite structures using tabu embedded simulated annealing
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Rama Mohan Rao(Structural Engineering Research Centre); N. Arvind(Structural Engineering Research Centre)"
] |
This paper deals with optimal stacking sequence design of laminate composite structures. The stacking sequence optimisation of laminate composites is formulated as a combinatorial problem and is solved using Simulated Annealing (SA), an algorithm devised based on inspiration of physical process of annealing of solids. The combinatorial constraints are handled using a correction strategy. The SA algorithm is strengthened by embedding Tabu search in order to prevent recycling of recently visited
solutions and the resulting algorithm is referred to as tabu embedded simulated Annealing (TSA) algorithm. Computational performance of the proposed TSA algorithm is enhanced through cache-fetch implementation. Numerical experiments have been conducted by considering rectangular composite panels and composite cylindrical shell with different ply numbers and orientations. Numerical studies indicate that the TSA algorithm is quite effective in providing practical designs for lay-up sequence optimisation
of laminate composites. The effect of various neighbourhood search algorithms on the convergence characteristics of TSA algorithm is investigated. The sensitiveness of the proposed optimisation algorithm
for various parameter settings in simulated annealing is explored through parametric studies. Later, the TSA algorithm is employed for multi-criteria optimisation of hybrid composite cylinders for simultaneously optimising cost as well as weight with constraint on buckling load. The two objectives are
initially considered individually and later collectively to solve as a multi-criteria optimisation problem. Finally, the computational efficiency of the TSA based stacking sequence optimisation algorithm has been compared with the genetic algorithm and found to be superior in performance.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465461
|
oai_dc
|
Fuzzy dynamic structural analysis of two-dimensional frame
|
Fuzzy dynamic structural analysis of two-dimensional frame
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Petr Štemberk(Czech Technical University); Jaroslav Kruis(Czech Technical University)"
] |
In this paper, a dynamic analysis based on the fuzzy set theory is presented as a possible complementary tool to the classical stochastic methods for dynamic analyses. Material parameters of a structure are influenced by uncertainties and therefore they are considered to be fuzzy quantities with
given distributions, that means fuzzy numbers with given membership functions. The fuzzy dynamic analysis is conducted with help of fuzzy arithmetic defined on the so-called α-cuts. The results of the analysis are also obtained in the form of fuzzy numbers, which compared to the stochastic methods is less computationaly expensive while at the same time they still provide information about the distribution of a quantity. This method is demonstrated on an analysis of a two-dimensional frame subjected to possible
seismic load, where the uncertain eigenmodes and eigenfrequencies are used in the modal analysis.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465460
|
oai_dc
|
Modeling and damage detection for cracked I-shaped steel beams
|
Modeling and damage detection for cracked I-shaped steel beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jun Zhao(A. Epstein and Sons, Inc.); John T. DeWolf(University of Connecticut)"
] |
This paper presents the results of a study to show how the development of a crack alters the structural behavior of I-shaped steel beams and how this can be used to evaluate nondestructive evaluation techniques. The approach is based on changes in the dynamic behavior. An approximate finite element
model for a cracked beam with I-shaped cross-section is developed based on a simplified fracture model. The model is then used to review different damage cases. Damage detection techniques are studied to determine their ability to identify the existence of the crack and to identify its location. The techniques studied are the coordinate modal assurance criterion, the modal flexibility, and the state and the slope arrays.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465462
|
oai_dc
|
A DQ nonlinear bending analysis of skew composite thin plates
|
A DQ nonlinear bending analysis of skew composite thin plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"P. Malekzadeh(Persian Gulf University)"
] |
A first endeavor is made to exploit the differential quadrature method (DQM) as a simple, accurate, and computationally efficient numerical tool for the large deformation analysis of thin laminated composite skew plates, which has very strong singularity at the obtuse vertex. The geometrical nonlinearity is modeled by using Green’s strain and von Karman assumption. A recently developed DQ methodology is used to exactly implement the multiple boundary conditions at the edges of skew plates, which is a major draw back of conventional DQM. Using oblique coordinate system and the DQ methodology, a mapping-DQ discretization rule is developed to simultaneously transform and discretize the equilibrium equations and the related boundary conditions. The effects of skew angle, aspect ratio and different types of boundary conditions on the convergence and accuracy of the presented method are
studied. Comparing the results with the available results from other numerical or analytical methods, it is shown that accurate results are obtained even when using only small number of grid points. Finally, numerical results for large deflection behavior of antisymmetric cross ply skew plates with different
geometrical parameters and boundary conditions are presented.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465454
|
oai_dc
|
An effective load increment method for multi modal adaptive pushover analysis of buildings
|
An effective load increment method for multi modal adaptive pushover analysis of buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K. Türker(Bal kesir University); E. Irtem(Bal kesir University)"
] |
In this study, an effective load increment method for multi modal adaptive non-linear static (pushover) analysis (NSA) for building type structures is presented. In the method, lumped plastisicity approach is adopted and geometrical non-linearties (second-order effects) are included. Non-linear yield conditions of column elements and geometrical non-linearity effects between successive plastic sections are linearized. Thus, load increment needed for formation of plastic sections can be determined directly (without applying iteration or step-by-step techniques) by using linearized yield conditions. After formation of each plastic section, the higher mode effects are considered by utilizing the essentials of traditional response spectrum analysis at linearized regions between plastic sections. Changing dynamic
properties due to plastification in the system are used on the calculation of modal lateral loads. Thus, the effects of stiffness changes and local mechanism at the system on lateral load distribution are included. By using the proposed method, solution can be obtained effectively for multi-mode whereby the properties change due to plastifications in the system. In the study, a new procedure for determination of modal lateral loads is also proposed. In order to evaluate the proposed method, a 20 story RC frame building is analyzed and compared with Non-linear Dynamic Analysis (NDA) results and FEMA 356 Non-linear Static Analysis (NSA) procedures using fixed loads distributions (first mode, SRSS and uniform distribution) in terms of different parameters. Second-order effects on response quantities and periods are also investigated. When the NDA results are taken as reference, it is seen that proposed method yield generally better results than all FEMA 356 procedures for all investigated response quantities.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465452
|
oai_dc
|
Stochastic optimum design criterion of added viscous dampers for buildings seismic protection
|
Stochastic optimum design criterion of added viscous dampers for buildings seismic protection
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Giuseppe Carlo Marano(Technical University of Bari); Francesco Trentadue(Technical University of Bari); Rita Greco(Technical University of Bari)"
] |
In this study a stochastic approach for linear viscous dampers design adopted for seismic protection of buildings is developed. Devices optimal placement into the main structure and their mechanical parameters are attained by means of a reliability-based optimum design criterion, in which an
objective function (O.F.) is minimized, subject to a stochastic constraint. The seismic input is modelled by a non stationary modulated Kanai Tajimi filtered stochastic process. Building is represented by means of a plane shear type frame model. The selected criterion for the optimization searches the minimum of the O.F., here assumed to be the cost of the seismic protection, i.e., assumed proportional to the sum of added dampings of each device. The stochastic constraint limits a suitable approximated measure of the structure
failure probability, here associated to the maximum interstorey drift crossing over a given threshold limit, related, according with modern Technical Codes, to the required damage control.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465459
|
oai_dc
|
Linear vibration analysis of isotropic conical shells by discrete singular convolution (DSC)
|
Linear vibration analysis of isotropic conical shells by discrete singular convolution (DSC)
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ömer Civalek(Akdeniz University)"
] |
토목공학
| null |
kci_detailed_000078.xml
|
||||
ART001465457
|
oai_dc
|
(4+n)-noded Moving Least Square(MLS)-based finite elements for mesh gradation
|
(4+n)-noded Moving Least Square(MLS)-based finite elements for mesh gradation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jae Hyuk Lim(Korea Advanced Institute of Science and Technology (KAIST)); 임세영(Korea Advanced Institute of Science and Technology (KAIST))"
] |
A new class of finite elements is described for dealing with mesh gradation. The approach employs the moving least square (MLS) scheme to devise a class of elements with an arbitrary number of nodal points on the parental domain. This approach generally leads to elements with rational shape
functions, which significantly extends the function space of the conventional finite element method. With a special choice of the nodal points and the base functions, the method results in useful elements with polynomial shape functions for which the C1 continuity breaks down across the boundaries between the subdomains comprising one element. Among those, (4 + n)-noded MLS based finite elements possess the generality to be connected with an arbitrary number of linear elements at a side of a given element. It
enables us to connect one finite element with a few finite elements without complex remeshing. The effectiveness of the new elements is demonstrated via appropriate numerical examples.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465458
|
oai_dc
|
Bounds on plastic strains for elastic plastic structures in plastic shakedown conditions
|
Bounds on plastic strains for elastic plastic structures in plastic shakedown conditions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Francesco Giambanco(Università degli Studi di Palermo); Luigi Palizzolo(Università degli Studi di Palermo); Alessandra Caffarelli(Università degli Studi di Palermo)"
] |
The problem related to the computation of bounds on plastic deformations for structures in plastic shakedown condition (alternating plasticity) is studied. In particular, reference is made to structures discretized by finite elements constituted by elastic perfectly plastic material and subjected to a special
combination of fixed and cyclic loads. The load history is known during the steady-state phase, but it is unknown during the previous transient phase; so, as a consequence, it is not possible to know the complete elastic plastic structural response. The interest is therefore focused on the computation of bounds on suitable measures of the plastic strain which characterizes just the first transient phase of the structural response, whatever the real load history is applied. A suitable structural model is introduced, useful to
describe the elastic plastic behaviour of the structure in the relevant shakedown conditions. A special bounding theorem based on a perturbation method is proposed and proved. Such theorem allows us to compute bounds on any chosen measure of the relevant plastic deformation occurring at the end of the transient phase for the structure in plastic shakedown; it represents a generalization of analogous bounding theorems related to the elastic shakedown. Some numerical applications devoted to a plane steel structure are effected and discussed.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465451
|
oai_dc
|
Characterization of the dynamic behavior of a linear guideway mechanism
|
Characterization of the dynamic behavior of a linear guideway mechanism
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jyh-Cheng Chang(National Chung-Hsin Univeristy); James Shih-Shyn Wu(National Chung-Hsin Univeristy); Jui-Pin Hung(National Chin-Yi Institute of Technology)"
] |
Dynamic behaviors of the contact surface between ball and raceway in a guideway mechanism vary with the applied loads and hence affect the mechanical responses of machine tools. The study aims to investigate the nonlinear characteristics of dynamic behaviors at the rolling contact interface
in linear guideway mechanisms. Firstly, analytical method was introduced to understand the contact behaviors based on Hertz contact theory in a point-to-point way. Then, the finite element approach with a three-dimensional surface-to-surface contact model and appropriate contact stiffness was developed to study the dynamic characteristics of such linear guideways. Finally, experiments with modal test were conducted to verify the significance of both the analytical and the numerical results. Results told that the
finite element approach may provide significant predictions. The study results also concluded that the current nonlinear models based on Hertz’s contact theory may accurately describe the contact characteristic of a linear guideway mechanism. In the modal analysis, it was told that the natural frequencies vary a little with different loading conditions; however, the mode shapes are changed obviously with the magnitude of applied loads. Therefore, the stiffness of contact interface needs to be properly adjusted during simulation which may affect the dynamic characteristics of the machine tools.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465456
|
oai_dc
|
Lateral force-displacement ductility relationship of non-ductile squat RC columns rehabilitated using FRP confinement
|
Lateral force-displacement ductility relationship of non-ductile squat RC columns rehabilitated using FRP confinement
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K. Galal(Concordia University)"
] |
Post-earthquake reconnaissance and experimental research indicate that squat reinforced concrete (RC) columns in existing buildings or bridge piers are vulnerable to non-ductile shear failure. Recently, several experimental studies were conducted to investigate upgrading the shear resistance
capacity of such columns in order to modify their failure mode to ductile one. Among these upgrading methods is the use of fibre-reinforced polymer (FRP) jackets. One of the preferred analytical tools to simulate the response of frame structures to earthquake loading is the lumped plasticity macromodels due
to their computational efficiency and reasonable accuracy. In these models, the columns’ nonlinear response is lumped at its ends. The most important input data for such type of models is the element’s lateral force-displacement backbone curve. The objective of this study is to verify an analytical method to
predict the lateral force-displacement ductility relationship of axially and laterally loaded rectangular RC squat columns retrofitted with FRP composites. The predicted relationship showed good accuracy when
compared with tests available in the literature.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465453
|
oai_dc
|
Experimental study on identification of stiffness change in a concrete frame experiencing damage and retrofit
|
Experimental study on identification of stiffness change in a concrete frame experiencing damage and retrofit
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"X. T. Zhou(The Hong Kong Polytechnic University); J. M. Ko(The Hong Kong Polytechnic University); Y. Q. Ni(The Hong Kong Polytechnic University)"
] |
This paper describes an experimental study on structural health monitoring of a 1:3-scaled one-story concrete frame subjected to seismic damage and retrofit. The structure is tested on a shaking table by exerting successively enhanced earthquake excitations until severe damage, and then retrofitted
using fiber-reinforced polymers (FRP). The modal properties of the tested structure at trifling, moderate, severe damage and strengthening stages are measured by subjecting it to a small-amplitude white-noise excitation after each earthquake attack. Making use of the measured global modal frequencies and a validated finite element model of the tested structure, a neural network method is developed to quantitatively identify the stiffness reduction due to damage and the stiffness enhancement due to strengthening. The identification results are compared with ‘true’ damage severities that are defined and determined based on visual inspection and local impact testing. It is shown that by the use of FRP retrofit, the stiffness of the severely damaged structure can be recovered to the level as in the trifling damage stage.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465433
|
oai_dc
|
Strength and behaviour of reinforced SCC wall panels in one-way action
|
Strength and behaviour of reinforced SCC wall panels in one-way action
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"N. Ganesan(National Institute of Technology Calicut); P.V. Indira(National Institute of Technology Calicut); S. Rajendra Prasad(National Institute of Technology Calicut)"
] |
A total of 28 wall panels were cast and tested under uniformly distributed axial load in oneway in-plane action to study the effect of slenderness ratio (SR) and aspect ratio (AR) on the ultimate load. Two concrete formulations, normal concrete (NC) and self compacting concrete (SCC), were used for the casting of wall panels. Out of 28 wall panels, 12 were made of NC and the remaining 16 panels were of SCC. All the 12 NC panels and 12 out of 16 SCC panels were used to study the influence of SR and the remaining 4 SCC panels were tested to study the effect of AR on the ultimate load. A brief review of studies available in literature on the strength and behaviour of reinforced concrete (RC) wall panels is presented. Load-deformation response was recorded and analyzed. The ultimate load of SCC wall panels decreases non-linearly with the increase in SR and decreases linearly with increasing values of AR. Based on this study a method is proposed to predict the ultimate load of reinforced SCC wall panels. The modified method includes the effect of SR, AR and concrete strength.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465440
|
oai_dc
|
Topological optimized design considering dynamic problem with non-stochastic structural uncertainty
|
Topological optimized design considering dynamic problem with non-stochastic structural uncertainty
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이동규(Research Institute of Industrial Science and Technology (RIST)); Uwe Starossek(Hamburg University of Technology); 신수미(부산대학교)"
] |
This study shows how uncertainties of data like material properties quantitatively have an influence on structural topology optimization results for dynamic problems, here such as both optimal topology and shape. In general, the data uncertainties may result in uncertainties of structural behaviors like deflection or stress in structural analyses. Therefore optimization solutions naturally depend on the uncertainties in structural behaviors, since structural behaviors estimated by the structural analysis method like FEM need to execute optimization procedures. In order to quantitatively estimate the effect of data uncertainties on topology optimization solutions of dynamic problems, a so-called interval analysis is utilized in this study, and it is a well-known non-stochastic approach for uncertainty estimate. Topology optimization is realized by using a typical SIMP method, and for dynamic problems the optimization seeks to maximize the first-order eigenfrequency subject to a given material limit like a volume. Numerical applications topologically optimizing dynamic wall structures with varied supports are studied to verify the non-stochastic interval analysis is also suitable to estimate topology optimization results with dynamic problems.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465444
|
oai_dc
|
Using multiple point constraints in finite element analysis of two dimensional contact problems
|
Using multiple point constraints in finite element analysis of two dimensional contact problems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C.H. Liu(Tamkang University); I Cheng(Tamkang University); An-Chi Tsai(Tamkang University); Lo-Jung Wang(UL International Services Ltd.-Taiwan Branch); J.Y. Hsu(Vivotek Inc.)"
] |
Two-dimensional elastic contact problems, including normal, tangential, and rolling contacts, are treated with the finite element method in this study. Stress boundary conditions and kinematic conditions are transformed into multiple point constraints for nodal displacements in the finite element method. Upon imposing these constraints into the finite element system equations, the calculated nodal stresses and nodal displacements satisfy stress and displacement contact conditions exactly. Frictional and frictionless contacts between elastically identical as well as elastically dissimilar materials are treated in this study. The contact lengths, sizes of slip and stick regions, the normal and the shear stresses can be found.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465445
|
oai_dc
|
Response of a frame structure on a canyon site to spatially varying ground motions
|
Response of a frame structure on a canyon site to spatially varying ground motions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kaiming Bi(The University of Western Australia); Hong Hao(The University of Western Australia); Weixin Ren(Central South University)"
] |
This paper studies the effects of spatially varying ground motions on the responses of a bridge frame located on a canyon site. Compared to the spatial ground motions on a uniform flat site, which is the usual assumptions in the analysis of spatial ground motion variation effects on structures, the spatial ground motions at different locations on surface of a canyon site have different intensities owing to local site amplifications, besides the loss of coherency and phase difference. In the proposed approach, the spatial ground motions are modelled in two steps. Firstly, the base rock motions are assumed to have the same intensity and are modelled with a filtered Tajimi-Kanai power spectral density function and an empirical spatial ground motion coherency loss function. Then, power spectral density function of ground motion on surface of the canyon site is derived by considering the site amplification effect based on the one dimensional seismic wave propagation theory. Dynamic, quasi-static and total responses of the model structure to various cases of spatially varying ground motions are estimated. For comparison, responses to uniform ground motion, to spatial ground motions without considering local site effects, to spatial ground motions without considering coherency loss or phase shift are also calculated. Discussions on the ground motion spatial variation and local soil site amplification effects on structural responses are made. In particular, the effects of neglecting the site amplifications in the analysis as adopted in most studies of spatial ground motion effect on structural responses are highlighted.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465435
|
oai_dc
|
Estimation of load and resistance factors based on the fourth moment method
|
Estimation of load and resistance factors based on the fourth moment method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhao-Hui Lu(Central South University); Yan-gang Zhao(Kanagawa University); Alfredo H-S. Ang(University of California, Irvine)"
] |
The load and resistance factors are generally obtained using the First Order Reliability Method (FORM), in which the design point should be determined and derivative-based iterations have to be used. In this paper, a simple method for estimating the load and resistance factors using the first four moments of the basic random variables is proposed and a simple formula for the target mean resistance is also proposed to avoid iteration computation. Unlike the currently used method, the load and resistance factors can be determined using the proposed method even when the probability density functions (PDFs) of the basic random variables are not available. Moreover, the proposed method does not need either the iterative computation of derivatives or any design points. Thus, the present method provides a more convenient and effective way to estimate the load and resistance factors in practical engineering. Numerical examples are presented to demonstrate the advantages of the proposed fourth moment method for determining the load and resistance factors.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465437
|
oai_dc
|
Calculation of eigenvalue and eigenvector derivatives with the improved Kron’s substructuring method
|
Calculation of eigenvalue and eigenvector derivatives with the improved Kron’s substructuring method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yong Xia(The Hong Kong Polytechnic University); Shun Weng(The Hong Kong Polytechnic University); You-Lin Xu(The Hong Kong Polytechnic University); Hong-Ping Zhu(Huazhong University of Science and Technology)"
] |
For large-scale structures, the calculation of the eigensolution and the eigensensitivity is usually very time-consuming. This paper develops the Kron’s substructuring method to compute the firstorder derivatives of the eigenvalues and eigenvectors with respect to the structural parameters. The global structure is divided into several substructures. The eigensensitivity of the substructures are calculated via the conventional manner, and then assembled into the eigensensitivity of the global structure by performing some constraints on the derivative matrices of the substructures. With the proposed substructuring method, the eigenvalue and eigenvector derivatives with respect to an elemental parameter are computed within the substructure solely which contains the element, while the derivative matrices of all other substructures with respect to the parameter are zero. Consequently this can reduce the computation cost significantly. The proposed substructuring method is applied to the GARTEUR AG-11 frame and a highway bridge, which is proved to be computationally efficient and accurate for calculation of the eigensensitivity. The influence of the master modes and the division formations are also discussed.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001465438
|
oai_dc
|
reinforced concrete frame element with shear effect
|
reinforced concrete frame element with shear effect
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hamid R. Valipour(University of Technology, Sydney); Stephen J. Foster(The University of New South Wales)"
] |
A novel flexibility-based 1D element that captures the material nonlinearity and second order P-Δ effects within a reinforced concrete frame member is developed. The formulation is developed for 2D planar frames in the modified fiber element framework but can readily be extended to 3D cases. The nonlinear behavior of concrete including cracking and crushing is taken into account through a modified hypo-elastic model. A parabolic and a constant shear stress distribution are used at section level to couple the normal and tangential tractions at material level. The lack of objectivity due to softening of concrete is addressed and objectivity of the response at the material level is attained by using a technique derived from the crack band approach. Finally the efficiency and accuracy of the formulation is compared with experimental results and is demonstrated by some numerical examples.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001632770
|
oai_dc
|
Using integrated displacement method to time-history analysis of steel frames with nonlinear flexible connections
|
Using integrated displacement method to time-history analysis of steel frames with nonlinear flexible connections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.A. Hadianfard(Shiraz University of Technology)"
] |
Most connections of steel structures exhibit flexible behaviour under cyclic loading. The flexible connections can be assumed as nonlinear rotational springs attached to the ends of each beam. The nonlinear behaviour of the connections can be considered by suitable moment-rotation relationship.
Time-history analysis by direct integration method can be used as a powerful technique to determine the nonlinear dynamic response of the structure. In conventional numerical integration, the response is evaluated for a series of short time increments. The limitations on the size of time intervals can be removed by using Chen and Robinson improved time history analysis method, in which the integrated displacements are used as the new variables in integrated equation of motion. The proposed method permits longer time intervals and reduces the computational works. In this paper the nonlinearity behaviour of the structure is summarized on the connections, and the step by step improved time-history analysis is used to calculate the dynamic response of the structure. Several numerical calculations which indicate the applicability and advantages of the proposed methodology are presented. These calculations illustrate the importance of the effect of the nonlinear behaviour of the flexible connections in the calculation of the dynamic response of steel frames.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001632765
|
oai_dc
|
Guided viscoelastic wave in circumferential direction of orthotropic cylindrical curved plates
|
Guided viscoelastic wave in circumferential direction of orthotropic cylindrical curved plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jiangong Yu(Henan Polytechnic University); Zhijuan Ma(Henan Polytechnic University)"
] |
In this paper, guided circumferential wave propagating in an orthotropic viscoelastic cylindrical curved plate subjected to traction-free conditions is investigated in the frame of the Kelvin-Voight viscoelastic theory. The obtained three wave equations are decoupled into two groups, Lamb-like wave and SH wave. They are separately solved by the Legendre polynomial series approach. The availability of the method is confirmed through the comparison with the published data of the SH wave for a viscoelastic flat plate. The dispersion curves and attenuation curves for the carbon fiber and prepreg cylindrical plates are illustrated and the viscous effect on dispersion curves is shown. The influences of the ratio of radius to thickness are analyzed.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001632767
|
oai_dc
|
The motion editor and high precision integration for optimal control of robot manipulators in dynamic structural systems
|
The motion editor and high precision integration for optimal control of robot manipulators in dynamic structural systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chen-Yuan Chen(National Pingtung University of Education); Ling-Huei Wang(National Pingtung University of Education)"
] |
The paper presents the motion editor for the robotic movement in the study. The Motion Editor can edit all motions which we want to need. This method is easy when the beginners edit to motions of robots. And let them have interesting in robot control. This paper proposes two methods to edit movements. First, we edit the robot's movement in VB environment, and then we use the Motion Editor to make it. Finally, we compared merit and defect with two methods. Indeed, it is convenient when we use the Motion Editor.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001632764
|
oai_dc
|
An iteration approach for multiple notch problem based on complex variable boundary integral equation
|
An iteration approach for multiple notch problem based on complex variable boundary integral equation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y. Z. Chen(Jiangsu University)"
] |
This paper provides an iteration approach for the solution of multiple notch problem, which is based on the complex variable boundary integral equation (CVBIE). The contours of notches are applied by some loadings. The source points are assumed on the boundary of individual notch and the displacements along the boundaries become unknowns to be investigated. After discretization of the BIE, many influence matrices are obtained. One does not need to assemble many influence matrices into a larger matrix. This will considerably reduce the work in the program. The displacements along the many boundaries can be obtained from an iteration. There is no limitation for the configuration of notches. Several numerical examples are provided to prove the efficiency of the suggested approach.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001632768
|
oai_dc
|
Simulation of corroded RC structures using a three-dimensional irregular lattice model
|
Simulation of corroded RC structures using a three-dimensional irregular lattice model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kunhwi Kim(Yonsei University); John E. Bolander(University of California, Davis); 임윤묵(연세대학교)"
] |
Deteriorative effects of steel corrosion on the structural response of reinforced concrete are simulated for varying degrees of corrosion. The simulation approach is based on a three-dimensional irregular lattice model of the bulk concrete, in which fracture is modeled using a crack band approach that conserves fracture energy. Frame elements and bond link elements represent the reinforcing steel and its interface with the concrete, respectively. Polylinear stress-slip properties of the link elements are determined, for several degrees of corrosion, through comparisons with direct pullout tests reported in the literature. The link properties are then used for the lattice modeling of reinforced concrete beams with similar degrees of corrosion of the main reinforcing steel. The model is successful in simulating several important effects of steel corrosion, including increased deflections, changes in flexural cracking behavior, and reduced yield load of the beam specimens.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001632769
|
oai_dc
|
Multiple damages detection in beam based approximate waveform capacity dimension
|
Multiple damages detection in beam based approximate waveform capacity dimension
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhibo Yang(Xi’an Jiaotong University); Xuefeng Chen(Xi’an Jiaotong University); Shaohua Tian(Xi’an Jiaotong University); Zhengjia He(Xi’an Jiaotong University)"
] |
A number of mode shape-based structure damage identification methods have been verified by numerical simulations or experiments for on-line structure health monitoring (SHM). However, many of them need a baseline mode shape generated by the healthy structure serving as a reference to identify damages. Otherwise these methods can hardly perform well when multiple cracks conditions occur. So it is important to solve the problems above. By aid of the fractal dimension method (FD), Qiao and Wang proposed a generalized fractal dimension (GFD) to detect the delamination damage. As a modification of GFD, Qiao and Cao proposed the approximate waveform capacity dimension (AWCD) technique to simplify the calculation of fractal and overcome the false peak appearing in the high mode shapes. Based on their valued work, this paper combined and applied the AWCD method and curvature mode shape data to detect multiple damages in beam. In the end, the identification properties of the AWCD for multiple damages have been verified by groups of Monte Carlo simulations and experiments.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001632763
|
oai_dc
|
Reliability analysis of tested steel I-beams with web openings
|
Reliability analysis of tested steel I-beams with web openings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guliz Bayramoglu(Istanbul Technical University)"
] |
This paper presents a reliability analysis of steel I-beams with rectangular web openings, based on a combination of the common probabilistic reliability methods, such as RSM, FORM and SORM and using data obtained from experimental tests performed at the Istanbul Technical University. A procedure is proposed to obtain the optimum design load that can be applied to this type of structural members, by taking into account specified target values of reliability indices for ultimate and serviceability limit states. The goal of the paper is to present an algorithm to obtain more realistic and economical design of beams and to demonstrate that it can be applied efficiently to steel I-beams with web openings. Finally, a sensitivity analysis is performed allowing to ranking the random variables according to their importance in the reliability analysis.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001632766
|
oai_dc
|
NURBS-based isogeometric analysis for thin plate problems
|
NURBS-based isogeometric analysis for thin plate problems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Shojaee(Shahid Bahonar University of Kerman); N. Valizadeh(Shahid Bahonar University of Kerman)"
] |
An isogeometric approach is presented for static analysis of thin plate problems of various geometries. Non-Uniform Rational B-Splines (NURBS) basis function is applied for approximation of the thin plate deflection, as for description of the geometry. The governing equation based on Kirchhoff plate theory, is discretized using the standard Galerkin method. The essential boundary conditions are enforced by the Lagrange multiplier method. Several typical examples of thin plate and thin plate on elastic foundation are solved and compared with the theoretical solutions and other numerical methods. The numerical results show the robustness and efficiency of the proposed approach.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001519222
|
oai_dc
|
Experimentally validated FEA models of HF2V damage free steel connections for use in full structural analyses
|
Experimentally validated FEA models of HF2V damage free steel connections for use in full structural analyses
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jonathan Desombre(University of Canterbury); Geoffrey W. Rodgers(University of Canterbury); Gregory A. MacRae(University of Canterbury); Timon Rabczuk(University of Canterbury); Rajesh P. Dhakal(University of Canterbury); J. Geoffrey Chase(University of Canterbury)"
] |
The aim of this research is to model the behaviour of recently developed high force to volume (HF2V) passive energy dissipation devices using a simple finite element (FE) model. Thus, the end result will be suitable for use in a standard FE code to enable computationally fast and efficient analysis and design. Two models are developed. First, a detailed axial model that models an experimental setup is created to validate the approach versus experimental results. Second, a computationally and geometrically simpler equivalent rotational hinge element model is presented. Both models are created in ABAQUS, a standard nonlinear FE code. The elastic, plastic and damping properties of the elements used to model the HF2V devices are based on results from a series of quasi-static force-displacement loops and velocity based tests of these HF2V devices. Comparison of the FE model results with the experimental results from a half scale steel beam-column sub-assembly are within 10% error. The rotational model matches the output of the more complex and computationally expensive axial element model. The simpler model will allow computationally efficient non-linear analysis of large structures with many degrees of freedom, while the more complex and physically accurate axial model will allow detailed analysis of joint connection architecture. Their high correlation to experimental results helps better guarantee the fidelity of the results of such investigations.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001519225
|
oai_dc
|
The Homotopy Perturbation Method for free vibration analysis of beam on elastic foundation
|
The Homotopy Perturbation Method for free vibration analysis of beam on elastic foundation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Baki Ozturk(Nigde University); Safa Bozkurt Coskun(Kocaeli University)"
] |
In this study, the homotopy perturbation method (HPM) is applied to free vibration analysis of beam on elastic foundation. This numerical method is applied on three different axially loaded cases, namely: 1) one end fixed, the other end simply supported; 2) both ends fixed and 3) both ends simply supported cases. Analytical solutions and frequency factors are evaluated for different ratios of axial load N acting on the beam to Euler buckling load, N_r. The application of HPM for the particular problem in this study gives results which are in excellent agreement with both analytical solutions and the variational iteration method (VIM) solutions for all the cases considered in this study and the differential transform method (DTM) results available in the literature for the fixed-pinned case.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001519218
|
oai_dc
|
Nonlinear vibration of hybrid composite plates on elastic foundations
|
Nonlinear vibration of hybrid composite plates on elastic foundations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wei-Ren Chen(Chinese Culture University); Chun-Sheng Chen(Lunghwa University of Science and Technology); Szu-Ying Yu(Lee Ming Institute of Technology)"
] |
In this paper, nonlinear partial differential equations of motion for a hybrid composite plate subjected to initial stresses on elastic foundations are established to investigate its nonlinear vibration behavior. Pasternak foundation and Winkler foundations are used to represent the plate-foundation interaction. The initial stress is taken to be a combination of pure bending stress plus an extensional stress in the example problems. The governing equations of motion are reduced to the time-dependent ordinary differential equations by the Galerkin's method. Then, the Runge-Kutta method is used to evaluate the nonlinear vibration frequency and frequency ratio of hybrid composite plates. The nonlinear vibration behavior is affected by foundation stiffness, initial stress, vibration amplitude and the thickness ratio of layer. The effects of various parameters on the nonlinear vibration of hybrid laminated plate are investigated and discussed.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001519215
|
oai_dc
|
Estimation of structure system input force using the inverse fuzzy estimator
|
Estimation of structure system input force using the inverse fuzzy estimator
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ming-Hui Lee(Chinese Military Academy)"
] |
This study proposes an inverse estimation method for the input forces of a fixed beam structural system. The estimator includes the fuzzy Kalman Filter (FKF) technology and the fuzzy weighted recursive least square method (FWRLSM). In the estimation method, the effective estimator are accelerated and weighted by the fuzzy accelerating and weighting factors proposed based on the fuzzy logic inference system. By directly synthesizing the robust filter technology with the estimator, this study presents an efficient robust forgetting zone, which is capable of providing a reasonable trade-off between the tracking capability and the flexibility against noises. The period input of the fixed beam structure system can be effectively estimated by using this method to promote the reliability of the dynamic performance analysis. The simulation results are compared by alternating between the constant and adaptive and fuzzy weighting factors. The results demonstrate that the application of the presented method to the fixed beam structure system is successful.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001519228
|
oai_dc
|
Fatigue life prediction based on Bayesian approach to incorporate field data into probability model
|
Fatigue life prediction based on Bayesian approach to incorporate field data into probability model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Dawn An(Korea Aerospace University); 최주호(한국항공대학교); Nam H. Kim(University of Florida); Sriram Pattabhiraman(University of Florida)"
] |
In fatigue life design of mechanical components, uncertainties arising from materials and manufacturing processes should be taken into account for ensuring reliability. A common practice is to apply a safety factor in conjunction with a physics model for evaluating the lifecycle, which most likely relies on the designer’s experience. Due to conservative design, predictions are often in disagreement with field observations, which makes it difficult to schedule maintenance. In this paper, the Bayesian technique, which incorporates the field failure data into prior knowledge, is used to obtain a more dependable prediction of fatigue life. The effects of prior knowledge, noise in data, and bias in measurements on the distribution of fatigue life are discussed in detail. By assuming a distribution type of fatigue life, its parameters are identified first, followed by estimating the distribution of fatigue life, which represents the degree of belief of the fatigue life conditional to the observed data. As more data are provided, the values will be updated to reduce the credible interval. The results can be used in various needs such as a risk analysis, reliability based design optimization, maintenance scheduling, or validation of reliability analysis codes. In order to obtain the posterior distribution, the Markov Chain Monte Carlo technique is employed,which is a modern statistical computational method which effectively draws the samples of the given distribution. Field data of turbine components are exploited to illustrate our approach, which counts as a regular inspection of the number of failed blades in a turbine disk.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001519224
|
oai_dc
|
Nonlinear aerodynamic stability analysis of orthotropic membrane structures with large amplitude
|
Nonlinear aerodynamic stability analysis of orthotropic membrane structures with large amplitude
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhoulian Zheng(Chongqing University); Yunping Xu(Chongqing University); Changjiang Liu(Chongqing University); Xiaoting He(Chongqing University); Weiju Song(Chongqing University)"
] |
The aerodynamic stability of orthotropic tensioned membrane structures with rectangular plane is theoretically studied under the uniform ideal potential flow. The aerodynamic force acting on the membrane surface is determined by the potential flow theory in fluid mechanics and the thin airfoil theory in aerodynamics. Then, based on the large amplitude theory and the D'Alembert's principle, the interaction governing equation of wind-structure is established. Under the circumstances of single mode response, the Bubnov-Galerkin approximate method is applied to transform the complicated interaction equation into a system of second order nonlinear differential equation with constant coefficients. Through judging the stability of the system characteristic equation, the critical divergence instability wind velocity is determined. Finally, from different parametric analysis, we can conclude that it has positive significance to consider the characteristics of orthotropic and large amplitude for preventing the instability destruction of structures.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001519229
|
oai_dc
|
Numerical investigation of an MR damper-based smart passive control system for mitigating vibration of stay cables
|
Numerical investigation of an MR damper-based smart passive control system for mitigating vibration of stay cables
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김인호(한국과학기술원); 정형조(한국과학기술원); 김정태(부경대학교)"
] |
An extensive numerical investigation on the magnetorheological (MR) damper-based smart passive control system for mitigating vibration of stay cables under wind loads has been conducted. The smart passive system is incorporated with an electromagnetic induction (EMI) device for reducing complexity of the conventional MR damper based semi-active control system by eliminating an external power supply part and a feedback control part (i.e., sensors and controller). In this study, the control performance of the smart passive system has been evaluated by using a cable structure model extracted from a full-scale long stay cable with high tension. Numerical simulation results of the proposed smart damping system are compared with those of the passive and semi-active control systems employing MR dampers. It is demonstrated from the results that the control performance of the smart passive control system is better than those of the passive control cases and comparable to those of the semi-active control systems in the forced vibration analysis as well as the free vibration analysis, even though there is no external power source in the smart passive system.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001359133
|
oai_dc
|
Influence of various sources in micropolar thermoelastic medium with voids
|
Influence of various sources in micropolar thermoelastic medium with voids
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rajneesh Kumar(Kurukshetra University); Praveen Ailawalia(Maharishi Markandeshwar University)"
] |
The present problem is concerned with the study of deformation of micropolar thermoelastic medium with voids under the influence of various sources acting on the plane surface. The analytic expressions of displacement components, force stress, couple stress, change in volume fraction field and temperature distribution are obtained in the transformed domain for Lord-Shulman (L-S) theory of thermoelasticity after applying the integral transforms. A numerical inversion technique has been applied to obtain the solution in the physical domain. The numerical results are presented graphically. Some
useful particular cases have also been deduced.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001359148
|
oai_dc
|
Variability of displacements and stresses at random variable state
|
Variability of displacements and stresses at random variable state
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"노혁천(세종대학교); 이필승(한국과학기술원 ); 최창근(한국과학기술원)"
] |
토목공학
| null |
kci_detailed_000078.xml
|
||||
ART001470916
|
oai_dc
|
Large deflection analysis of orthotropic, elliptic membranes
|
Large deflection analysis of orthotropic, elliptic membranes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Somchai Chucheepsakul(King Mongkut’s University of Technology Thonburi); Sakdirat Kaewunruen(RailCorp - Track Engineering); Apiwat Suwanarat(King Mongkut’s University of Technology Thonburi)"
] |
Applications of membrane mechanisms are widely found in nano-devices and nano-sensor technologies nowadays. An alternative approach for large deflection analysis of the orthotropic, elliptic membranes – subject to gravitational, uniform pressures often found in nano-sensors – is described in this paper. The material properties of membranes are assumed to be orthogonally isotropic and linearly elastic, while the principal directions of elasticity are parallel to the coordinate axes. Formulating the potential
energy functional of the orthotropic, elliptic membranes involves the strain energy that is attributed to inplane stress resultant and the potential energy due to applied pressures. In the solution method, Rayleigh-Ritz method can be used successfully to minimize the resulting total potential energy generated. The set of equilibrium equations was solved subsequently by Newton-Raphson. The unparalleled model formulation capable of analyzing the large deflections of both circular and elliptic membranes is verified
by making numerical comparisons with existing results of circular membranes as well as finite element solutions. The results are found in excellent agreements at all cases. Then, the parametric investigations are given to delineate the impacts of the aspect ratios and orthotropic elasticity on large static tensions and deformations of the orthotropic, elliptic membranes.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001470919
|
oai_dc
|
Exact solution for forced torsional vibration of finite piezoelectric hollow cylinder
|
Exact solution for forced torsional vibration of finite piezoelectric hollow cylinder
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. M. Wang(Zhejiang University); C. B. Liu(Zhejiang University); H. J. Ding(Zhejiang University)"
] |
An exact solution is obtained for forced torsional vibration of a finite class 622 piezoelectric hollow cylinder with free-free ends subjected to dynamic shearing stress and time dependent electric potential at both internal and external surfaces. The solution is first expanded in axial direction with
trigonometric series and the governing equations for the new variables about radial coordinate r and time t are derived with the aid of Fourier series expansion technique. By means of the superposition method and the separation of variables technique, the solution for torsional vibration is finally obtained. Natural frequencies and the transient torsional responses for finite class 622 piezoelectric hollow cylinder with free-free ends are computed and illustrated.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001359128
|
oai_dc
|
Seismic performance of high strength reinforced concrete columns
|
Seismic performance of high strength reinforced concrete columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hakim Bechtoula(National Earthquake Engineering Center); Susumu Kono(Kyoto University); Fumio Watanabe(Kyoto University)"
] |
This paper summarizes an experimental and analytical study on the seismic behavior of high strength reinforced concrete columns under cyclic loading. In total six cantilever columns with different sizes and concrete compressive strengths were tested. Three columns, small size, had a 325 × 325 ㎜ cross section and the three other columns, medium size, were 520 × 520 ㎜. Concrete compressive strength was 80, 130 and 180 MPa. All specimens were designed in accordance with the Japanese design guidelines. The tests demonstrated that, for specimens made of 180 MPa concrete compressive strength, spalling of cover concrete was very brittle followed by a significant decrease in strength. Curvature was much important for the small size than for the medium size columns. Concrete compressive strength had
no effect on the curvature distribution for a drift varying between .2% and +2%. However, it had an effect on the drift corresponding to the peak moment and on the equivalent viscous damping variation. Simple equations are proposed for 1) evaluating the concrete Young’s modulus for high strength concrete and for 2) evaluating the moment-drift envelope curves for the medium size columns knowing that of the small size columns. Experimental moment-drift and axial strain-drift histories were well predicted using a fiber model developed by the authors.
|
토목공학
| null |
kci_detailed_000078.xml
|
|||
ART001470920
|
oai_dc
|
Stresses around an underground opening with sharp corners due to non-symmetrical surface load
|
Stresses around an underground opening with sharp corners due to non-symmetrical surface load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Karinski Y.S.(National Building Research Institute); Yankelevsky D.Z.(National Building Research Institute); Antes M.Y.(National Building Research Institute)"
] |
The paper aims at analyzing the stress distribution around an underground opening that is subjected to non-symmetrical surface loading with emphasis on opening shapes with sharp corners and the stress concentrations developed at these locations. The analysis is performed utilizing the BIE method coupled with the Neumann’s series. In order to implement this approach, the special recurrent relations for half plane were proven and the modified Shanks transform was incorporated to accelerate the series
convergence. To demonstrate the capability of the developed approach, a horseshoe shape opening with sharp corners was investigated and the location and magnitude of the maximum hoop stress was calculated. The dependence of the maximum hoop stress location on the parameters of the surface loading (degree of asymmetry, size of loaded area) and of the opening (the opening height) was studied. It was found that the absolute magnitude of the maximum hoop stress (for all possible surface loading locations) is developed at the roof points when the opening height/width ratio is relatively large or when the pressure loading area is relatively narrow (compared to the roof arch radius), and contrarily, when the opening height/width ratio is relatively small or when the surface pressure is applied to a relatively wide area, the absolute magnitude of the maximum hoop stress is developed at the bottom sharp corner points.
|
토목공학
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kci_detailed_000079.xml
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