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ART000911470
|
oai_dc
|
On an improved numerical method to solve the equilibrium problems f solids with bounded tensile strength that are subjected to thermal strain
|
On an improved numerical method to solve the equilibrium problems f solids with bounded tensile strength that are subjected to thermal strain
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"GiovanniPimpinelli(Politencnico di Bari)"
] |
In this paper we recall briefly the constitutive equations for solids subjected to thermal straintaking in account the bounded tensile stress of the material. In view to solve the equilibrium problem viathe finite element method using the Newton Raphson procedure, we show that the tangent elasticity tensoris semi-definite positive. Therefore, in order to obtain a convergent numerical method, the constitutiveequation needs to be modified. Specifically, the dependency of the stress by the anelastic deformation ismade explicit by means of a parameter d, varying from 0 to 1, that factorizes the elastic tensor. Thisparameterization, for d near to 0, assures the positiveness of the tangent elasticity tensor and enforces theconvergence of the numerical method. Some numerical examples are illustrated.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART000911540
|
oai_dc
|
Analytical model for the prediction of the eigen modes of a beam with open cracks and external strengthening
|
Analytical model for the prediction of the eigen modes of a beam with open cracks and external strengthening
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"P.A.Ovigne(Universite Claude Bernard); M.Massenzio(Universite Claude Bernard); E.Jacquelin(Universite Claude Bernard); P.Hamelin(Universite Claude Bernard)"
] |
The aim of this study is to develop an analytical model of a beam with open cracks andexternal strengthening which is able to predict its modal scheme components (natural frequencies andmode shapes). The model is valid as far as the excitation level is low enough not to activate non lineareffects. The application field of the model are either the prediction of the efficiency of the reinforcementor the non destructive assessment of the structural properties. The degres of freedom associated to thefault lips must be taken into account in order to introduce the effect of the external strengthening. In afirst step, an analytical formulation of a beam with thin notches is proposed according to the references.The model is then extended to incorporate the strengthening consisting in a longitudinal stiffness appliedin the vicinity of the cracks. In a second step, the analytical results are compared with these obtainedfrom a finite element simulation.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART000911542
|
oai_dc
|
Modal control algorithm on optimal ontrol of intelligent struccture shape
|
Modal control algorithm on optimal ontrol of intelligent struccture shape
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"GuoFengYao(Jilin University); SuHanChen(Jilin University); WeiWang(Jilin University)"
] |
In this paper, a new block iterative algorithm is presented by using the special feature of thecontinuous Riccati equation in the optimal shape control. Because the real-time control require that theCPU time should be as short as possible, an appropriate modal control algorithm is sought. Thecomputing cost is less than the one of the all state feedback control. A numerical example is given toillustrate the algorithm.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART000911548
|
oai_dc
|
Numerical simulation of masonry shear panels with distinct element approach
|
Numerical simulation of masonry shear panels with distinct element approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y.Zhuge(University of South Australia); S.Hunt(University of Adelaide)"
] |
Masonry is not a simple material, the influence of mortar joints as a plane of weakness is asignificant feature and this makes the numerical modelling of masonry very dificult especially whendynamic (seismic) analysis is involved. In order to develop a simple numerical model for masonry underearthquake load, an analytical model based on Distinct Element Method (DEM) is being developed. Atthe first stage, the model is applied to simulate the in-plane shear behaviour of an unreinforced masonrywall with and without opening where the testing results are available for comparison. In DEM, a solid isrepresented as an assembly of discrete blocks. Joints are modelled as interface between distinct bodies. Itis a dynamic process and specially designed to model the behaviour of discontinuities. The numericalsolutions obtained from the distinct element analysis are validated by comparing the results with thoseobtained from existing experiments and finite element modelling.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART000911473
|
oai_dc
|
Nonlinear analysis of cable-styaed spatial latticed structures
|
Nonlinear analysis of cable-styaed spatial latticed structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"DaiZhou(TongJi University); HongyuLiu(TongJi University); BoJin(TongJi University)"
] |
The combination of spatial latticed structures (hereafter SLS) and flexible cables, the cable-stayed spatial latticed structures (hereafter CSLS) can cros longer span. According to variation principle,a novel geometric nonlinear formulation for 3-D bar elements considering large displacement andinfinitesimal rotation increments with second-order precision is developed. The cable nonlinearity isinvestigated and it is taken that the secant modulus method can be considered as an exact method for acable member. The tower column with which the cables link is regarded as a special kind of beamelement, and, a new simplified stiffness formulation is presented. The computational strategies for thenonlinear dynamic response of structures are given, and the ultimate load carrying capacities and seismicresponses are analyzed numerically. It is noted that, compared with corresponding spatial latticed shells,the cable-stayed spatial latticed shells have more strength and more stiffness, and that the vertical seismicresponses of both CSLS and CLS are remarkably greater than the horizontal ones. In addition, thecomputation shows that the stiffness of tower column influences the performance of CSLS to a certainextent and the improvement of structural strength and stiffness of CSLS is relevant not only to cables butalso to tower columns.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001195665
|
oai_dc
|
Nonlinear dynamic buckling of laminated angle-ply composite spherical caps
|
Nonlinear dynamic buckling of laminated angle-ply composite spherical caps
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.S.Gupta(Institute of Armament Technology); B.P.Patel(Institute of Armament Technology); M.Ganapathi(Institute of Armament Technology)"
] |
This paper deals with nonlinear asymmetric dynamic buckling of clamped laminated angle-ply composite spherical shells under suddenly applied pressure loads. The formulation is based on first-order shear deformation theory and Lagranges equation of motion. The nonlinearity due to finitedeformation of the shell considering von Karmans assumptions is included in the formulation. Thebuckling loads are obtained through dynamic response history using Newmarks numerical integrationscheme coupled with a Newton-Raphson iteration technique. An axisymmetric curved shell element isused to investigate the dynamic characteristics of the spherical caps. The pressure value beyond which themaximum average displacement response shows significant growth rate in the time history of the shelstructure is considered as critical dynamic load. Detailed numerical results are presented to highlight theinfluence of ply-angle, shell geometric parameter and asymmetric mode on the critical load of sphericalcaps.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115472
|
oai_dc
|
A continuity method for bridges constructed with precast prestressed concrete girders
|
A continuity method for bridges constructed with precast prestressed concrete girders
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이환우(Pukyong Nat. Univ.); R. W. Barnes(Auburn University); Kwang Yang Kim(Pukyong Nat. Univ.)"
] |
A method of making simply supported girders continuous is described for bridges with spansof 30-45 m. The splicing method takes advantage of an induced secondary moment to transform the self-weight stresses in the precast simply supported girders into values representative of a continuous girder.The secondary moment results from prestressing of continuity tendons and detensioning of temporarytendons in the girders. Preliminary sections are selected for spliced U-girder bridges with a range of spanlengths. Use of the proposed technique results in girder depth reductions of 50-800 mm when comparedto standard simply supported I-girder bridges. The flexural behavior of an example bridge with 40-mspans is examined to illustrate the necessary considerations for determining the optimum sequence ofsplicing operations.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001198099
|
oai_dc
|
A new hierarchic degenerated shell element for geometrically non-linear analysis of composite laminated square and skew plates
|
A new hierarchic degenerated shell element for geometrically non-linear analysis of composite laminated square and skew plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"우광성(영남대학교); Jin-Hwan Park(Yeungnam University); 홍종현(탐라대학교)"
] |
This paper extends the use of the hierarchic degenerated shell element to geometric non-linear analysis of composite laminated skew plates by the p-version of the finite element method. For thegeometric non-linear analysis, the total Lagrangian formulation is adopted with moderately largedisplacement and small strain being accounted for in the sense of von Karman hypothesis. The presentmodel is based on equivalent-single layer laminate theory with the first order shear deformation includinga shear correction factor of 5/6. The integrals of Legendre polynomials are used for shape functions withp-level varying from 1 to 10. A wide variety of linear and non-linear results obtained by the p-versionfinite element model are presented for the laminated skew plates as well as laminated square plates. Anumerical analysis is made to illustrate the influence of the geometric non-linear effect on the transversedeflections and the stresses with respect to width/depth ratio (a/h), skew angle (b), and stacking sequenceof layers. The present results are in good agreement with the results in literatures.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115390
|
oai_dc
|
A fourth order finite difference method applied to elastodynamics: Finite element and boundary element formulations
|
A fourth order finite difference method applied to elastodynamics: Finite element and boundary element formulations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"L. A. Souza(CT/UEL); J. A. M. Carrer(COPPE/UFRJ); C. J. Martins(COPPE/UFRJ)"
] |
This work presents a direct integration scheme, based on a fourth order finite diferenceapproach, for elastodynamics. The proposed scheme was chosen as an alternative for attenuating the errorsdue to the use of the central diference method, mainly when the time-step length approaches the criticaltime-step. In addition to eliminating the spurious numerical oscillations, the fourth order finite diferencescheme keeps the advantages of the central difference method: reduced computer storage and norequirement of factorisation of the effective stiffness matrix in the step-by-step solution. A studyconcerning the stability of the fourth order finite difference scheme is presented. The Finite ElementMethod and the Boundary Element Method are employed to solve elastodynamic problems. In order toverify the accuracy of the proposed scheme, two examples are presented and discussed at the end of thiswork.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115435
|
oai_dc
|
Bond strenth modeling for corroded reinforcement in reinforced concrete
|
Bond strenth modeling for corroded reinforcement in reinforced concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiaohui Wang(Shanghai Jiaotong Univ.); Xila Liu(Shanghai Jiaotong Univ.)"
] |
Steel corrosion in reinforced concrete structures leads to concrete cover cracking, reductionof bond strength, and reduction of stel cross section. Among theses consequences mentioned, reductionof bond strength between reinforcement and concrete is of great importance to study the behaviour of RCmembers with corroded reinforcement. In this paper, firstly, an analytical model based on smearedcracking and average stress-strain relationship of concrete in tension is proposed to evaluate the maximumbursting pressure development in the cover concrete for noncorroded bar. Secondly, the internal pressurecaused by the expansion of the corrosion products is evaluated by treating the cracked concrete as anorthotropic material. Finally, bond strength for corroded reinforcing bar is calculated and compared withtest results.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001198100
|
oai_dc
|
Structual analysis based on multiresolution blind system identification algorithm
|
Structual analysis based on multiresolution blind system identification algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gee-Pinn J. Too(Nat. Cheng Kung University); Chih-Chung K. Wang(Nat. Cheng Kung University); Rumin Chao(Inst. of High Performance Comput)"
] |
A new process for estimating the natural frequency and the corresponding damping ratio inlarge structures is discussed. In a practical situation, it is very difficult to analyze large structures preciselybecause they are too complex to model using the finite element method and too heavy to excite using theexciting force method; in particular, the measured signals are seriously influenced by ambient noise. Inorder to identify the structural impulse response associated with the information of natural frequency andthe corresponding damping ratio in large structures, the analysis process, a so-called ultiresolution blindsystem identification algorithm which combines Mallat algorithm and the bicepstrum method. High time-frequency concentration is attained and the phase information is kept. The experimental result hasdemonstrated that the new analysis process exploiting the natural frequency and the correspondingdamping ratio of structural response are useful tools in structural analysis application.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART000948161
|
oai_dc
|
Mesh distortion sensitivity of 8-node plane elsticity elements based on parametric, metric, parametric-metric, and metric-parametric formulations
|
Mesh distortion sensitivity of 8-node plane elsticity elements based on parametric, metric, parametric-metric, and metric-parametric formulations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Rajendran(Nanyang Tech. University); S. Subramanian(Microwave Tube Res & Development Ctr.)"
] |
The classical 8-node isoparametric serendipity element uses parametric shape functions forboth test and trial functions. Although this element performs well in general, it yields poor results undersevere mesh distortions. The distortion sensitivity is caused by the lack of continuity and/or completenessof shape functions used for test and trial functions. A recent element using parametric and metric shapefunctions for constructing the test and trial functions exhibits distortion imunity. This paper discuses thechoice of parametric or metric shape functions as the basis for test and/or trial functions, satisfaction ofcontinuity and completenes requirements, and their connection to distortion sensitivity. Also, theperformances of four types of elements, viz., parametric, metric, parametric-metric, and metric-parametric,are compared for distorted meshes, and their merits and demerits are discussed.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115433
|
oai_dc
|
The G. D. Q. method for the harmonic dynamic analysis of rotational shell structural elements
|
The G. D. Q. method for the harmonic dynamic analysis of rotational shell structural elements
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Erasmo Viola(D.I.S.T.A.R.T.); Edoardo Artioli(D.I.S.T.A.R.T.)"
] |
This paper deals with the modal analysis of rotational shell structures by means of thenumerical solution technique known as the Generalized Differential Quadrature (G. D. Q.) method. Thetreatment is conducted within the Reissner first order shear deformation theory (F. S. D. T.) for linearlyelastic isotropic shells. Starting from a non-linear formulation, the compatibility equations via Principle ofVirtual Works are obtained, for the general shell structure, given the internal equilibrium equations interms of stress resultants and couples. These equations are subsequently linearized and specialized for therotational geometry, expanding all problem variables in a partial Fourier series, with respect to thelongitudinal coordinate. The procedure leads to the fundamental system of dynamic equilibrium equationsin terms of the reference surface kinematic harmonic components. Finally, a one-dimensional problem, bymeans of a set of five ordinary diferential equations, in which the only spatial coordinate appearing is theone along meridians, is obtained. This can be conveniently solved using an appropriate G. D. Q. methodin meridional direction, yielding accurate results with an extremely low computational cost and not usingthe so-called elta-pointtechnique.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115434
|
oai_dc
|
Nonlinear analysis of reinforced concrete beam elements subject to cyclical combined actions of torsion, biaxial flexure and axial forces
|
Nonlinear analysis of reinforced concrete beam elements subject to cyclical combined actions of torsion, biaxial flexure and axial forces
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gian Michele Cocci(Univ. of Ancona); Paolo Tiriaca(Univ. of Ancona)"
] |
This paper presents a method for the nonlinear analysis of beam elements subjected to thecyclical combined actions of torsion, biaxial flexure and axial forces based on an extension of thedisturbed compresion field (DSFM). The theoretical model is based on a hybrid formulation between thefull rotation of the cracks model and the fixed direction of the cracking model. The described formulation,which treats cracked concrete as an orthotropic material, includes a new approach for the evaluation ofthe re-orientation of both the compression field and the deformation field by removing the restriction oftheir coincidence. A new equation of congruence permits evaluating the deformation of the middle line.The problem consists in the solution of coupled nonlinear simultaneous equations expressing equilibrium,congruence and the constitutive laws. The proposed method makes it posible to determine thedeformations of the beam element according to the external stresses applied.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115307
|
oai_dc
|
Ultimate behavior of reinforced concrete cooling tower: Evaluation and comparison of design guidelines
|
Ultimate behavior of reinforced concrete cooling tower: Evaluation and comparison of design guidelines
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hyuk-Chun Noh(Columbia Univ.); Chang-Koon Choi(KAIST)"
] |
Control of structural response due to seismic excitation in a manner of coupling adjacentbuildings has been actively developed, and most attention focused on those buildings of similar height.However, with the rapid development of some modern cities, multi-story buildings constructed with anconstruction scheme. Being inspired by the positively examined coupling control approach for buildingswith similar height, this paper aims to provide a comprehensive analytical study on control effectivenessof using friction dampers to link the two buildings with significant height diference to supplement therecent experimental investigation carried out by the writers. The analytical model of a coupled buildingpotential advantage of coupling the main building and podium structure with control devices that providea lower degree of coupling, the inherent demerit of rigid-coupled configuration is then evaluated.Extensive parametric studies are finally performed. The concerned parameters influencing the design ofoptimal friction force and control efficiency include variety of earthquake excitation and diferences inthe feasibility of interaction control approach applied to the complex structure for vibration reduction dueto seismic excitation is supported by positive results.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001001882
|
oai_dc
|
Free vibration analysis of rotating cantilever plates using the p-version of the finite element method
|
Free vibration analysis of rotating cantilever plates using the p-version of the finite element method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sidi Mohammed Hamza-Cherif(Univ. Abou Bekr Belkaid)"
] |
The application of cellular materials in load-carrying and security-relevant structures requires
the exact prediction of their mechanical behavior, which necessitates the development of robust simulation
models and techniques based on appropriate experimental procedures. The determination of the yield
surface requires experiments under multi-axial stress states because the yield behavior is sensitive to the
hydrostatic stress and simple uniaxial tests aim only to determine one single point of the yield surface.
Therefore, an experimental technique based on a uniaxial strain test for the description of the influence of
the hydrostatic stress on the yield condition in the elastic-plastic transition zone at small strains is
proposed and numerically investigated. Furthermore, this experimental technique enables the determination
of a second elastic constant, e.g., Poisson’s ratio.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115260
|
oai_dc
|
Analytical solutions of in-plane static problems for non-uniform curved beams including axial and shear deformations
|
Analytical solutions of in-plane static problems for non-uniform curved beams including axial and shear deformations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ekrem Tufekci(Istanbul Technical Univ.); Alaeddin Arpaci(Istanbul Technical Univ.)"
] |
This paper presents a virtual boundary element-equivalent collocation method (VBEM) for
the plane magnetoelectroelastic solids, which is based on the fundamental solutions of the plane
magnetoelectroelastic solids and the basic idea of the virtual boundary element method for elasticity.
Besides all the advantages of the conventional boundary element method (BEM) over domain
discretization methods, this method avoids the computation of singular integral on the boundary by
introducing the virtual boundary. In the end, several numerical examples are performed to demonstrate the
performance of this method, and the results show that they agree well with the exact solutions. So the
method is one of the efficient numerical methods used to analyze megnatoelectroelastic solids.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115263
|
oai_dc
|
Non-linear time-dependent post-elastic analysis of suspended cable considering creep effect
|
Non-linear time-dependent post-elastic analysis of suspended cable considering creep effect
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Kmet(Tech. Univ. of Kosice); M. Tomko(Tech. Univ. of Kosice); J. Brda(Tech. Univ. of Kosice)"
] |
This paper deals with the effects of various moisture environments on the structural behaviorthe Laboratoire Central des Ponts et Chauses (LCPC), with Electricit de France (EDF) as a partner.The aim of this paper is to point out and to quantify the strains resulting from unidirectional moistureconditions: a drying gradient applied during 14 months, followed by the re-wetting of the dried surfaceabsorption is pointed out. Moreover, a lot of tests on companion cylinders and prisms were carried out todetermine the mechanical characteristics of the material and help checking analysis methods. The paperfocuses on numerous measurements obtained during the 23 months on one plain concrete beam and onereinforced concrete beam: variation of water content, followed by precise weighing and gammadensitometry,relative humidity measurements, local and global deformations in the three directions and deflection of thebeams. Thus, the effects of drying and water absorption on the behavior of concrete structures aredocumented and analyzed in comparison with existing representation of water diffusion.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115262
|
oai_dc
|
New development of artificial record generation by wavelet theory
|
New development of artificial record generation by wavelet theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"G. Ghodrati Amiri(Iran Univ. of Sci. & Technol.); P. Ashtari(Iran Univ. of Sci. & Technol); H. Rahami(Iran Univ. of Sci. & Technol)"
] |
The paper summarizes the dynamic-based assessment of a reinforced concrete arch bridge,
dating back to the 50’s. The outlined approach is based on ambient vibration testing, output-only modal
identification and updating of the uncertain structural parameters of a finite element model. The Peak
Picking and the Enhanced Frequency Domain Decomposition techniques were used to extract the modal
parameters from ambient vibration data and a very good agreement in both identified frequencies and
mode shapes has been found between the two techniques. In the theoretical study, vibration modes were
determined using a 3D Finite Element model of the bridge and the information obtained from the field
tests combined with a classic system identification technique provided a linear elastic updated model,
accurately fitting the modal parameters of the bridge in its present condition. Hence, the use of outputonly
modal identification techniques and updating procedures provided a model that could be used to
evaluate the overall safety of the tested bridge under the service loads.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001001883
|
oai_dc
|
A kind of NiTi-wire shape memory alloy damper to simultaneously damp tension, compression and torsion
|
A kind of NiTi-wire shape memory alloy damper to simultaneously damp tension, compression and torsion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yu-Lin Han(Southeast Univ.); Hai-Yang Yin(Southeast Univ.); Er-Tian Xiao(Southeast Univ.); Zhi-Lin Sun(Southeast Univ.); Ai-Qun Li(Southeast Univ.)"
] |
토목공학
| null |
kci_detailed_000082.xml
|
||||
ART001115261
|
oai_dc
|
Crack effect on the elastic buckling behavior of axially and eccentrically loaded columns
|
Crack effect on the elastic buckling behavior of axially and eccentrically loaded columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"L. Zhou(Xiln Univ. of Arch. Technol.); Y. Huang(Wuyi Univ.)"
] |
Three-dimensional description of building structure taking into consideration soil-structureinteraction is a very complex problem and solution of this problem is often obtained by using finiteelement method. However, this method takes a significant amount of computational time and memory.such as wall and floor slab elements, plane and three-dimensional joints and lintels, that could provideaccurate results with significantly reduced computational time, is proposed in this study for the analysisthree-dimensional structures subjected to dynamic load. The examples prove the efficiency and thecomputing possibilities of the model.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349654
|
oai_dc
|
Quantitative nondestructive evaluation of thin plate structures using the complete frequency information from impact testing
|
Quantitative nondestructive evaluation of thin plate structures using the complete frequency information from impact testing
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이상열(안동대학교); Guillermo Rus(University of Granada); 박대효(한양대학교)"
] |
This article deals the theory for solving an inverse problem of plate structures using the frequency-domain information instead of classical time-domain delays or free vibration eigenmodes or eigenvalues. A reduced set of output parameters characterizing the defect is used as a regularization technique to drastically overcome noise problems that appear in imaging techniques. A deconvolution scheme from an undamaged specimen overrides uncertainties about the input signal and other coherent noises. This approach provides the advantage that it is not necessary to visually identify the portion of the signal that contains the information about the defect. The theoretical model for Quantitative nondestructive evaluation, the relationship between the real and ideal models, the finite element method (FEM) for the forward problem, and inverse procedure for detecting the defects are developed. The theoretical
formulation is experimentally verified using dynamic responses of a steel plate under impact loading at several points. The signal synthesized by FEM, the residual, and its components are analyzed for different choices of time window. The noise effects are taken into account in the inversion strategy by designing a filter for the cost functional to be minimized. The technique is focused toward a exible and rapid inspection of large areas, by recovering the position of the defect by means of a single accelerometer, overriding experimental calibration, and using a reduced number of impact events.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349647
|
oai_dc
|
Effect of prestressing on the first flexural natural frequency of beams
|
Effect of prestressing on the first flexural natural frequency of beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"O. R. Jaiswal(Visvesvaraya National Institute of Technology)"
] |
In this paper the effect of prestressing force on the first flexural natural frequency of beams is studied. Finite element technique is used to model the beam-tendon system, and the prestressing force is applied in the form of initial tension in the tendon. It is shown that the effect of prestressing force on
the first natural frequency depends on bonded and unbonded nature of the tendon, and also on the eccentricity of tendon. For the beams with bonded tendon, the prestressing force does not have any appreciable effect on the first flexural natural frequency. However, for the beams with unbonded tendon,
the first natural frequency significantly changes with the prestressing force and eccentricity of the tendon. If the eccentricity of tendon is small, then the first natural frequency decreases with the prestressing force and if the eccentricity is large, then the first flexural natural frequency increases with the prestressing force. Results of the present study clearly indicate that the first natural frequency can not be used as an easy indicator for detecting the loss of prestressing force, as has been attempted in some of the past studies.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349657
|
oai_dc
|
Nonlinear dynamic analysis by Dynamic Relaxation method
|
Nonlinear dynamic analysis by Dynamic Relaxation method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Rezaiee-Pajand(Ferdowsi University); J. Alamatian(Ferdowsi University)"
] |
Numerical integration is an efficient approach for nonlinear dynamic analysis. In this paper, general category of the implicit integration errors will be discussed. In order to decrease the errors, Dynamic Relaxation method with modified time step (MFT) will be used. This procedure leads to an alternative algorithm which is very general and can be utilized with any implicit integration scheme. For numerical verification of the proposed technique, some single and multi degrees of freedom nonlinear dynamic systems will be analyzed. Moreover, results are compared with both exact and other available
solutions. Suitable accuracy, high efficiency, simplicity, vector operations and automatic procedures are the main merits of the new algorithm in solving nonlinear dynamic problems.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349662
|
oai_dc
|
Numerical method for biaxially loaded reinforced and prestressed concrete slender columns with arbitrary section
|
Numerical method for biaxially loaded reinforced and prestressed concrete slender columns with arbitrary section
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"T.J. Lou(Zhejiang University); Y.Q. Xiang(Zhejiang University)"
] |
In this study, a numerical procedure based on the finite element method for materially and geometrically nonlinear analysis of reinforced and prestressed concrete slender columns with arbitrary section subjected to combined biaxial bending and axial load is developed. In order to overcome the low computer efficiency of the conventional section integration method in which the reinforced concrete section is divided into a large number of small areas, an efficient section integration method is used to determine the section tangent stiffness. In this method, the arbitrary shaped cross section is divided into
several concrete trapezoids according to boundary vertices, and the contribution of each trapezoid to section stiffness is determined by integrating directly the trapezoid. The space frame flexural theory is utilized to derive the element tangent stiffness matrix. The nonlinear full-range member response is traced by an updated normal plane arc-length solution method. The analytical results agree well with the experimental ones.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349646
|
oai_dc
|
Mean moment effect on circular thin-walled tubes under cyclic bending
|
Mean moment effect on circular thin-walled tubes under cyclic bending
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kao-Hua Chang(Nat. Cheng Kung Univ.); Wen-Fung Pan(National Cheng Kung University); Kuo-Long Lee(Far East College)"
] |
In this paper, experimental and theoretical investigations of the effect of the mean moment on the response and collapse of circular thin-walled tubes subjected to cyclic bending are discussed. To highlight the influence of the mean moment effect, three different moment ratios r (minimum moment/
maximum moment) of −1, −0.5 and 0, respectively, were experimentally investigated. It has been found that the moment-curvature loop gradually shrinks with the number of cycles, and becomes stable after a few cycles for symmetric cyclic bending (r = −1). However, the moment-curvature loop exhibits ratcheting and increases with the number of cycles for unsymmetric cyclic bending (r = −0.5 or 0). In addition, although the three groups of tested specimens had three different moment ratios, when plotted in a log-log scale, three parallel straight lines describe the relationship between the controlled moment range and the number of cycles necessary to produce buckling. Finally, the endochronic theory combined with the principle of virtual work was used to simulate the relationship among the moment, curvature and
ovalization of thin-walled tubes under cyclic bending. An empirical formulation was proposed for simulating the relationship between the moment range and the number of cycles necessary to produce buckling for thin-walled tubes subjected to cyclic bending with different moment ratios. The results of the
experimental investigation and the simulation are in good agreement with each other.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349666
|
oai_dc
|
A laminated composite plate finite element a-priori corrected for locking
|
A laminated composite plate finite element a-priori corrected for locking
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"João Elias Abdalla Filho(Pontifícia Univ Católica do Paraná (PUCPR)); Ivan Moura Belo(Pontifícia Univ Católica do Paraná (PUCPR)); Michele Schunemann Pereira(Pontifícia Univ Católica do Paraná (PUCPR))"
] |
A four-node plate finite element for the analysis of laminated composites which is developed using strain gradient notation is presented. The element is based on a first-order shear deformation theory and on the equivalent lamina assumption. Strains and stresses can be calculated at different points through the thickness of the plate. They are averaged values due to the equivalent lamina assumption. A shear correction factor is used as the transverse shear strain is taken to be constant over the plate thickness
while its actual variation is parabolic. Strain gradient notation, which is physically interpretable, allows for the detailed a-priori analysis of the finite element model. The polynomial expansions are inspected and spurious terms responsible for modeling errors are identified in the shear strains polynomial expansions. The element is corrected by simply removing the spurious terms from the shear strains expansions. The element is implemented into a FORTRAN finite element code in two versions; namely, with and without
spurious terms. Results are compared to show the effects of the spurious terms on the solutions. It is also shown that a refined mesh composed of corrected elements provides solutions which approximate very well the analytical solutions, validating the procedure.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349660
|
oai_dc
|
Earthquake behavior of stiffened RC frame structures with/without subsoil
|
Earthquake behavior of stiffened RC frame structures with/without subsoil
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y. I. Özdemir(Karadeniz Technical University); Y. Ayvaz(Karadeniz Technical University)"
] |
The purpose of this study is to investigate the linear earthquake behavior of the frame structures including subsoil with different stiffening members and to compare the results of each frame considered. These comparisons are made separately for displacement, bending moments and axial forces for frames with different storey and bay numbers for the time history and the modal analyses. The results of both methods are also compared. The results of the frames with subsoil are also compared with the results of the frames without subsoil. It is concluded that all stiffening members considered in this study
decrease the lateral displacement of the frame and the bending moment of the columns and increase the axial force in the columns and that configuration of the bracing members come out to be an important parameter in braced frames since the frames with the same type of bracing give different results
depending on configuration. It is also concluded that, in general, the absolute maximum displacements of the frames modeled with subsoil are larger than those of the frames modeled without subsoil.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001367658
|
oai_dc
|
Experimental and numerical verification of hydraulic displacement amplification damping system
|
Experimental and numerical verification of hydraulic displacement amplification damping system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tracy Sau-Kwai Chung(Hong Kong Polytechnic University); Eddie Siu-Shu Lam(Hong Kong Polytechnic University); Bo Wu(South China University of Technology); You-Lin Xu(Hong Kong Polytechnic University)"
] |
Hong Kong is now recognized as an area of moderate seismic hazard, but most of the buildings have been designed with no seismic provision. It is of great significance to develop effective and practical measures to retrofit existing buildings against moderate seismic attacks. Researches show
that beam-column joints are critical structural elements to be retrofitted for seismic resistance for reinforced concrete frame structures. This paper explores the possibility of using a Hydraulic Displacement Amplification Damping System (HDADS), which can be easily installed at the exterior of
beam-column joints, to prevent structural damage against moderate seismic attacks. A series of shaking table tests were carried out with a 1/3 prototype steel frame have been carried out to assess the performance of the HDADS. A Numerical model representing the HDADS is developed. It is also used in
numerical simulation of the shaking table tests. The numerical model of the HDADS and the numerical simulation of the shaking table tests are verified by experimental results.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001367661
|
oai_dc
|
Transient soil-structure interaction with consistent description of radiation damping
|
Transient soil-structure interaction with consistent description of radiation damping
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ediansjah Zulkifli(Technische Universität Dresden); Peter Ruge(Technische Universität Dresden)"
] |
Radiation damping due to wave propagation in unbounded domains may cause a significant reduction of structural vibrations when excited near resonance. Here a novel matrix-valued algebraic Padélike stiffness formulation in the frequency-domain and a corresponding state equation in the time domain are elaborated for a soil-structure interaction problem with a layered soil excited in a transient manner by a flexible rotor during startup and shutdown. The contribution of radiation damping caused by a soil-layer
upon a rigid bedrock is characterized by the corresponding amount of critical damping as it is used in structural dynamics.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001367660
|
oai_dc
|
Damage mechanics approach and modeling nonuniform cracking within finite elements for safety evaluation of concrete dams in 3D space
|
Damage mechanics approach and modeling nonuniform cracking within finite elements for safety evaluation of concrete dams in 3D space
|
{
"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); B. Jalalzadeh(KN-Toosi University of Technology)"
] |
An anisotropic damage mechanics approach is introduced which models the static and dynamic behavior of mass concrete in 3D space. The introduced numerical approach is able to model non-uniform cracking within the cracked element due to cracking in Gaussian points of elements. The validity of the proposed model is considered using available experimental and theoretical results under the static and dynamic loads. No instability and stress locking is observed in the conducted analyses. The Morrow Point dam is analyzed including dam-reservoir interaction effects to consider the nonlinear
seismic behavior of the dam. It is found that the resulting crack profiles are in good agreement with those obtained from the smeared crack approach. It is concluded that the proposed model can be used in nonlinear static and dynamic analysis of concrete dams in 3D space and enables engineers to define the damage level of these infrastructures. The performance level of the considered system is used to assess the static and seismic safety using the defined performance based criteria.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001367663
|
oai_dc
|
Spectral analysis of semi-actively controlled structures subjected to blast loading
|
Spectral analysis of semi-actively controlled structures subjected to blast loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C.M. Ewing(University of Canterbury); C. Guillin(University of Canterbury); R.P. Dhakal(University of Canterbury); J.G. Chase(University of Canterbury)"
] |
This paper investigates the possibility of controlling the response of typical portal frame structures to blast loading using a combination of semi-active and passive control devices. A one storey reinforced concrete portal frame is modelled using non-linear finite elements with each column discretised
into multiple elements to capture the higher frequency modes of column vibration response that are typical features of blast responses. The model structure is subjected to blast loads of varying duration, magnitude and shape, and the critical aspects of the response are investigated over a range of structural periods in the form of blast load response spectra. It is found that the shape or length of the blast load is not a factor in the response, as long as the period is less than 25% of the fundamental structural period.
Thus, blast load response can be expressed strictly as a function of the momentum applied to the structure by a blast load. The optimal device arrangements are found to be those that reduce the first peak of the
structural displacement and also reduce the subsequent free vibration of the structure. Semi-active devices that do not increase base shear demands on the foundations in combination with a passive yielding tendon are found to provide the most effective control, particularly if base shear demand is an important consideration, as with older structures. The overall results are summarised as response spectra for eventual potential use within standard structural design paradigms.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001367662
|
oai_dc
|
Nonlinear analysis of the influence of increments amounts and history load on soil response
|
Nonlinear analysis of the influence of increments amounts and history load on soil response
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Krešo Ivandic(Faculty of Geotechnical Engineering); Božo Soldo(Faculty of Geotechnical Engineering)"
] |
The soil response calculation is described, by which, threw the fictive path of stress, the stress-deformation diagrams are determined, considering the nonlinear soil behavior. The calculation are lead incrementally, by which is shown that in the presented soil model (modified Cam Clay), considering the influence of overconsolidated soil pressure OCR, the number of calculation steps may, but not necessarily, have a sufficient influence on the value of failure load and definite soil deformation. The simplicity and the practicalness of the procedure, the enables modeling the complex relations in soil.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001367659
|
oai_dc
|
Non linear vibrations of stepped beam systems using artificial neural networks
|
Non linear vibrations of stepped beam systems using artificial neural networks
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. M. Ba datli(Celal Bayar University); E. Özkaya(Celal Bayar University); H.A. Özyi it(Zonguldak Karaelmas University); A. Tekin(Celal Bayar University)"
] |
In this study, the nonlinear vibrations of stepped beams having different boundary conditions were investigated. The equations of motions were obtained by using Hamilton’s principle and made non dimensional. The stretching effect induced non-linear terms to the equations. Natural
frequencies are calculated for different boundary conditions, stepped ratios and stepped locations by Newton-Raphson Method. The corresponding nonlinear correction coefficients are also calculated for the fundamental mode. At the second part, an alternative method is produced for the analysis. The calculated natural frequencies and nonlinear corrections are used for training an artificial neural network (ANN) program which has a multi-layer, feed-forward, back-propagation algorithm. The results of the algorithm
produce errors less than 2.5% for linear case and 10.12% for nonlinear case. The errors are much lower for most cases except clamped-clamped end condition. By employing the ANN algorithm, the natural frequencies and nonlinear corrections are easily calculated by little errors, and the computational time is drastically reduced compared with the conventional numerical techniques.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001367664
|
oai_dc
|
Vibration analysis of asymmetric shear wall and thin walled open section structures using transfer matrix method
|
Vibration analysis of asymmetric shear wall and thin walled open section structures using transfer matrix method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kanat Burak Bozdogan(Ege University); Duygu Ozturk(Ege University)"
] |
A method for vibration analysis of asymmetric shear wall and Thin walled open section structures is presented in this paper. The whole structure is idealized as an equivalent bending-warping torsion beam in this method. The governing differential equations of equivalent bending-warping torsion beam are formulated using continuum approach and posed in the form of simple storey transfer matrix. By using the storey transfer matrices and point transfer matrices which consider the inertial forces, system transfer matrix is obtained. Natural frequencies can be calculated by applying the boundary conditions. The structural properties of building may change in the proposed method. A numerical example has been solved at the end of study by a program written in MATLAB to verify the presented method. The results of this example display
the agreement between the proposed method and the other valid method given in literature.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001367665
|
oai_dc
|
Design of materials with prescribed elastic properties using D-functions
|
Design of materials with prescribed elastic properties using D-functions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guangyu Qiu(Dalian University of Technology); Xingsi Li(Dalian University of Technology)"
] |
토목공학
| null |
kci_detailed_000082.xml
|
||||
ART001349863
|
oai_dc
|
Simple nonlinear static analysis of steel portal frame with pitched roof exposed to fire
|
Simple nonlinear static analysis of steel portal frame with pitched roof exposed to fire
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Panagis G. Papadopoulos(Aristotle University of Thessaloniki); Anastassia K. Papadopoulou(Aristotle University of Thessaloniki); Kyriakos K. Papaioannou(Aristotle University of Thessaloniki)"
] |
Plane steel portal frames, with pitched roof, exposed to fire, are examined. First, a determinate frame is analysed by hand. For flexible columns and shallow roof, snap-through occurs before plastic hinges mechanism is formed. An indeterminate frame with shorter columns and taller roof is also
analysed by hand. Then, the same frame is simulated by a truss and a nonlinear static analysis is performed by use of a short computer program. The results of computer analysis by use of truss model are compared with those of analysis by hand and a satisfactory approximation between them is observed.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349866
|
oai_dc
|
Shear lag prediction in symmetrical laminated composite box beams using artificial neural network
|
Shear lag prediction in symmetrical laminated composite box beams using artificial neural network
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rajeev Chandak(Indian Institute of Technology); Akhil Upadhyay(Indian Institute of Technology); Pradeep Bh(Indian Institute of Technology)"
] |
Presence of high degree of orthotropy enhances shear lag phenomenon in laminated composite box-beams and it persists till failure. In this paper three key parameters governing shear lag behavior of laminated composite box beams are identified and defined by simple expressions. Uniqueness
of the identified key parameters is proved with the help of finite element method (FEM) based studies. In addition to this, for the sake of generalization of prediction of shear lag effect in symmetrical laminated composite box beams a feed forward back propagation neural network (BPNN) model is developed. The network is trained and tested using the data base generated by extensive FEM studies carried out for various b/D, b/tF, tF/tW and laminate configurations. An optimum network architecture has been
established which can effectively learn the pattern. Computational efficiency of the developed ANN makes it suitable for use in optimum design of laminated composite box-beams.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001350113
|
oai_dc
|
In-plane bulk material displacement and deformation measurements using digital image correlation of ultrasonic C-scan images
|
In-plane bulk material displacement and deformation measurements using digital image correlation of ultrasonic C-scan images
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Brad Regez(Southern Illinois University at Carbondale); Ying Zhang(Southern Illinois University at Carbondale); Tsuchin Chu(Southern Illinois University at Carbondale); Jarlen Don(Southern Illinois University at Carbondale); Ajay Mahajan(Southern Illinois University at Carbondale)"
] |
토목공학
| null |
kci_detailed_000082.xml
|
||||
ART001349864
|
oai_dc
|
Two collinear Mode-I cracks in piezoelectric/piezomagnetic materials
|
Two collinear Mode-I cracks in piezoelectric/piezomagnetic materials
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhen-Gong Zhou(Harbin Institute of Technology); Jia-Zhi Wang(Harbin Institute of Technology); Lin-Zhi Wu(Harbin Institute of Technology)"
] |
In this paper, the behavior of two collinear Mode-I cracks in piezoelectric/piezomagnetic materials subjected to a uniform tension loading was investigated by the generalized Almansi’s theorem. Through the Fourier transform, the problem can be solved with the help of two pairs of triple integral equations, in which the unknown variables were the jumps of displacements across the crack surfaces. To solve the triple integral equations, the jumps of displacements across the crack surfaces were directly expanded as a series of Jacobi polynomials to obtain the relations among the electric displacement intensity factors, the magnetic flux intensity factors and the stress intensity factors at the crack tips. The interaction of two collinear cracks was also discussed in the present paper.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349867
|
oai_dc
|
Computational modeling of coupled fluid-structure systems with applications
|
Computational modeling of coupled fluid-structure systems with applications
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y. Kerboua(École Polytechnique de Montréal); A.A. Lakis(École Polytechnique de Montréal); M. Thomas(École de Technologie Supérieure); L. Marcouiller(Institut de Recherche d’Hydro Quebec)"
] |
This paper outlines the development of a computational model in order to analyze the dynamic behaviour of coupled fluid-structure systems such as a) liquid containers, b) a set of parallel or radial plates. In this work a hybrid fluid-solid element is developed, capable of simulating both membrane
and bending effects of the plate. The structural mass and stiffness matrices are determined using exact integration of governing equations which are derived using a combination of classical plate theory and a finite element approach. The Bernoulli equation and velocity potential function are used to describe the liquid pressure applied on the solid-fluid element. An impermeability condition assures a permanent contact at the fluid-structure interface. Applications of this model are presented for both parallel and radial
plates as well as fluid-filled rectangular reservoir. The effect of physical parameters on the dynamic behaviour of a coupled fluid-structure system is investigated. The results obtained using the presented approach for dynamic characteristics such as natural frequency are in agreement to those calculated using other theories and experiments.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349858
|
oai_dc
|
Numerical modeling of coupled structural and hydraulic interactions in tunnel linings
|
Numerical modeling of coupled structural and hydraulic interactions in tunnel linings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. H. Shin(건국대학교)"
] |
Tunnels are generally constructed below the ground water table, which produces a long-term interaction between the tunnel lining and the surrounding geo-materials. Thus, in conjunction with tunnel design, the presence of water may require a number of considerations such as: leakage and water load. It has been reported that deterioration of a drainage system of tunnels is one of the main factors governing the long-term hydraulic and structural lining-ground interaction. Therefore, the design procedure of an
underwater tunnel should address any detrimental effects associated with this interaction. In this paper an attempt to identify the coupled structural and hydraulic interaction between the lining and the ground was made using a numerical method. A main concern was given to local hindrance of flow into tunnels. Six cases of local deterioration of a drainage system were considered to investigate the effects of deterioration on tunnels. It is revealed that hindrance of flow increased pore-water pressure on the deteriorated areas, and caused detrimental effects on the lining structures. The analysis results were compared with those from fully permeable and impermeable linings.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349861
|
oai_dc
|
Behaviour of welded beam-to-column joints subjected to the static load
|
Behaviour of welded beam-to-column joints subjected to the static load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Davor Skejic(University of Zagreb); Darko Dujmovic(University of Zagreb); Boris Androic(University of Zagreb)"
] |
Neglecting the real joint behaviour in frame analysis may result in unrealistic predictions of the response and reliability of steel frames. The reliability of the prediction of main joint properties according to the component method (Eurocode 3-Part 1.8) still remains open to further investigation. The first step toward the solution is to compare the theoretical expressions given in EN 1993-1-8 and the experimental results. With that goal in mind six nominally the same, but really different specimens of welded beam-to-column joints subjected to static load were tested. The specimens present a combination of nominally identical structural elements produced in different European mills. This paper provides these tests, as well as their detailed evaulation and interpretation. All three joint structural properties (rotational
stiffness, moment resistance and rotation capacity) have been considered. Four models for determining the plastic resistance out of experimental Mj-φ curves have been applied. The results that have been discussed in detail, point to the fact that EN 1993-1-8 underestimates the real structural properties of the tested type of joint, as well as to the conclusion that detailed research of this problem needs to be conducted using the probabilistic reliability methods.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358174
|
oai_dc
|
Modelling of concrete structures subjected to shock and blast loading: An overview and some recent studies
|
Modelling of concrete structures subjected to shock and blast loading: An overview and some recent studies
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yong Lu(The University of Edinburgh)"
] |
The response of concrete structures subjected to shock and blast load involves a rapid transient phase, during which material breach may take place. Such an effect could play a crucial role in determining the residual state of the structure and the possible dispersion of the fragments. Modelling of the transient phase response poses various challenges due to the complexities arising from the dynamic behaviour of the materials and the numerical difficulties associated with the evolving material discontinuity and large deformations. Typical modelling approaches include the traditional finite element method in conjunction with an element removal scheme, various meshfree methods such as the SPH, and the mesoscale model. This paper is intended to provide an overview of several alternative approaches and
discuss their respective applicability. Representative concrete material models for high pressure and high rate applications are also commented. Several recent application studies are introduced to illustrate the
pros and cons of different modelling options.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358169
|
oai_dc
|
Reinforced concrete wall as protection against accidental explosions in the petrochemical industry
|
Reinforced concrete wall as protection against accidental explosions in the petrochemical industry
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Daniel Ambrosini(National University of Cuyo); Bibiana Maria Luccioni(Natiuonal University of Tucuman)"
] |
In this paper the study of a reinforced concrete wall used as protection against accidental explosions in the petrochemical industry is presented. Many alternatives of accidental scenarios and sizes of the wall are analyzed and discussed. Two main types of events are considered, both related to vessel bursts: Pressure vessel bursts and BLEVE. The liberated energy from the explosion was calculated following procedures firmly established in the practice and the effects over the structures and the reinforced concrete wall were calculated by using a CFD tool. The results obtained show that the
designed wall reduces the values of the peak overpressure and impulse and, as a result, the damage levels to be expected. It was also proved that a reinforced concrete wall can withstand the blast load for the considered events and levels of pressure and impulse, with minor damage and protect the buildings.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358166
|
oai_dc
|
Explosive loading of multi storey RC buildings: Dynamic response and progressive collapse
|
Explosive loading of multi storey RC buildings: Dynamic response and progressive collapse
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. Weerheijm(Delft University of Technology); J. Mediavilla(TNO Defence); J.C.A.M. van Doormaal(TNO Defence)"
] |
The resilience of a city confronted with a terrorist bomb attack is the background of the paper. The resilience strongly depends on vital infrastructure and the physical protection of people. The protection buildings provide in case of an external explosion is one of the important elements in safety assessment. Besides the aspect of protection, buildings facilitate and enable many functions, e.g., offices, data storage, -handling and -transfer, energy supply, banks, shopping malls etc. When a building is damaged, the loss of functions is directly related to the location, amount of damage and the damage level. At TNO Defence, Security and Safety methods are developed to quantify the resilience of city infrastructure systems (Weerheijm et al. 2007b). In this framework, the dynamic response, damage levels and residual bearing capacity of multi-storey RC buildings is studied. The current paper addresses the aspects of dynamic response and progressive collapse, as well as the proposed method to relate the structural damage to a volume-damage parameter, which can be linked to the loss of functionality. After a general introduction to the research programme and progressive collapse, the study of the dynamic response and damage due to blast loading for a single RC element is described. Shock tube experiments on plates are used as a reference to study the possibilities of engineering methods and an explicit finite element code to quantify the response and residual bearing capacity. Next the dynamic response and progressive collapse of a multi storey RC building is studied numerically, using a number of models. Conclusions are drawn on the ability to predict initial blast damage and progressive collapse. Finally the link between the structural damage of a building and its loss of functionality is described, which is essential input for the envisaged method to quantify the resilience of city infrastructure.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358179
|
oai_dc
|
Bond slip modelling and its effect on numerical analysis of blast-induced responses of RC columns
|
Bond slip modelling and its effect on numerical analysis of blast-induced responses of RC columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yanchao Shi(Tianjin University); Hong Hao(the University of Western Australia); Zhong-Xian Li(Tianjin University)"
] |
Reinforced concrete (RC) structures consist of two different materials: concrete and steel bar. The stress transfer behaviour between the two materials through bond plays an important role in the loadcarrying
capacity of RC structures, especially when they subject to lateral load such as blast and seismic load. Therefore, bond and slip between concrete and reinforcement bar will affect the response of RC structures under such loads. However, in most numerical analyses of blast-induced structural responses, the perfect bond between concrete and steel bar is often assumed. The main reason is that it is very difficult to model bond slip in the commercial finite element software, especially in hydrodynamic codes. In the present study, a one-dimensional slide line contact model in LS-DYNA for modeling sliding of
rebar along a string of concrete nodes is creatively used to model the bond slip between concrete and steel bars in RC structures. In order to model the bond slip accurately, a new approach to define the parameters of the one-dimensional slide line model from common pullout test data is proposed. Reliability and accuracy of the proposed approach and the one-dimensional slide line in modelling the bond slip between concrete and steel bar are demonstrated through comparison of numerical results and experimental data. A case study is then carried out to investigate the bond slip effect on numerical analysis of blast-induced responses of a RC column. Parametric studies are also conducted to investigate the effect of bond shear modulus, maximum elastic slip strain, and damage curve exponential coefficient
on blast-induced response of RC columns. Finally, recommendations are given for modelling the bond slip in numerical analysis of blast-induced responses of RC columns.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358208
|
oai_dc
|
Behavior and simplified analysis of steel-concrete composite beams subjected to localized blast loading
|
Behavior and simplified analysis of steel-concrete composite beams subjected to localized blast loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guo-Qiang Li(Tongji University); Su-Wen Chen(Tongji University); Tao-Chun Yang(Tongji University)"
] |
Finite element simulations are increasingly used in structural analysis and design, especially in cases where complex structural and loading conditions are involved. Due to considerable progresses in computer technology as well as nonlinear finite-element analysis techniques in past years, it has become possible to pursue an accurate analysis of the complex blast-induced structural effects by means of numerical simulations. This paper aims to develop a better understanding of the behavior of steel-concrete composite beams (SCCB) under localized blast loading through a numerical parametric study. A finite element model is set up to simulate the blast-resistant features of SCCB using the transient dynamic analysis software LS-DYNA. It is demonstrated that there are three dominant failure modes for SCCB
subjected to localized blast loading. The effect of loading position on the behavior of SCCB is also investigated. Finally, a simplified model is proposed for assessing the overall response of SCCB subjected to localized blast loading.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358206
|
oai_dc
|
Inelastic two-degree-of-freedom model for roof frame under airblast loading
|
Inelastic two-degree-of-freedom model for roof frame under airblast loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"박종일(국방과학연구소); Theodor Krauthammer(University of Florida)"
] |
When a roof frame is subjected to the airblast loading, the conventional way to analyze the damage of the frame or design the frame is to use single degree of freedom (SDOF) model. Although a roof frame consists of beams and girders, a typical SDOF analysis can be conducted only separately for each component. Thus, the rigid body motion of beams by deflections of supporting girders can not be easily considered. Neglecting the beam-girder interaction in the SDOF analysis may cause serious inaccuracies in the response values in both Pressure-Impulse curve (P-I) and Charge Weight-Standoff Diagrams (CWSD). In this paper, an inelastic two degrees of freedom (TDOF) model is developed, based on force equilibrium equations, to consider beam-girder interaction, and to assess if the modified SDOF
analysis can be a reasonable design approach.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358198
|
oai_dc
|
Validation study on numerical simulation of RC response to close-in blast with a fully coupled model
|
Validation study on numerical simulation of RC response to close-in blast with a fully coupled model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yong Lu(University of Edinburgh); Shunfeng Gong(Zhejiang Univ.); Zhenguo Tu(University of Edinburgh); Weiliang Jin(Zhejiang Univ.)"
] |
The characteristic response of a structure to blast load may be divided into two distinctive phases, namely the direct blast response during which the shock wave effect and localized damage take place, and the post-blast phase whereby progressive collapse may occur. A reliable post-blast analysis depends on a sound understanding of the direct blast effect. Because of the complex loading environment and the stress wave effects, the analysis on the direct effect often necessitates a high fidelity numerical model with coupled fluid (air) and solid subdomains. In such a modelling framework, an appropriate representation of the blast load and the high nonlinearity of the material response is a key to a reliable outcome. This paper presents a series of calibration study on these two important modelling considerations
in a coupled Eulerian-Lagrangian framework using a hydrocode. The calibration of the simulated blast load is carried out for both free air and internal explosions. The simulation of the extreme dynamic response of concrete components is achieved using an advanced concrete damage model in conjunction with an element erosion scheme. Validation simulations are conducted for two representative scenarios; one involves a concrete slab under internal blast, and the other with a RC column under air blast, with a particular focus on the simulation sensitivity to the mesh size and the erosion criterion.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358185
|
oai_dc
|
Modelling the dynamic response and failure modes of reinforced concrete structures subjected to blast and impact loading
|
Modelling the dynamic response and failure modes of reinforced concrete structures subjected to blast and impact loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tuan Ngo(University of Melbourne); Priyan Mendis(University of Melbourne)"
] |
Responding to the threat of terrorist attacks around the world, numerous studies have been conducted to search for new methods of vulnerability assessment and protective technologies for critical infrastructure under extreme bomb blasts or high velocity impacts. In this paper, a two-dimensional behavioral rate dependent lattice model (RDLM) capable of analyzing reinforced concrete members subjected to blast and impact loading is presented. The model inherently takes into account several major influencing factors: the progressive cracking of concrete in tension, the inelastic response in compression, the yielding of reinforcing steel, and strain rate sensitivity of both concrete and steel. A computer code using the explicit algorithm was developed based on the proposed lattice model. The explicit code along with the proposed numerical model was validated using experimental test results from the Woomera blast trial.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358204
|
oai_dc
|
Damage assessment for buried structures against internal blast load
|
Damage assessment for buried structures against internal blast load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"G.W. Ma(Nanyang Technological University); X. Huang(Nanyang Technological University); J.C. Li(Nanyang Technological University)"
] |
Damage assessment for buried structures against an internal blast is conducted by considering the soil-structure interaction. The structural element under analysis is assumed to be rigid-plastic and simply-supported at both ends. Shear failure, bending failure and combined failure modes are included based on five possible transverse velocity profiles. The maximum deflections with respect to shear and bending failure are derived respectively by employing proper failure criteria of the structural element. Pressure-Impulse diagrams to assess damage of the buried structures are subsequently developed. Comparisons have been done to evaluate the influences of the soil-structure interaction and the shear-tobending strength ratio of the structural element. A case study for a buried reinforced concrete structure
has been conducted to show the applicability of the proposed damage assessment method.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358214
|
oai_dc
|
Tearing of metallic sandwich panels subjected to air shock loading
|
Tearing of metallic sandwich panels subjected to air shock loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Feng Zhu(Swinburne University of Technology); Dong Ruan(Swinburne University of Technology); Dongwei Shu(Nanyang Technological University); Guoxing Lu(Swinburne University of Technology)"
] |
This paper presents a computational study for the structural response of blast loaded metallic sandwich panels, with the emphasis placed on their failure behaviours. The fully-clamped panels are square, and the honeycomb core and skins are made of the same aluminium alloy. A material model considering strain and strain rate hardening effects is used and the blast load is idealised as either a uniform or localised pressure over a short duration. The deformation/failure procedure and modes of the sandwich panels are identified and analysed. In the uniform loading condition, the effect of core density and face-sheets thicknesses is analysed. Likewise, the influence of pulse shape on the failure modes is investigated by deriving a pressure-impulse (P-I) diagram. For localised loading, a comparative study is
carried out to assess the blast resistant behaviours of three types of structures: sandwich panel with honeycomb core, two face-sheets with air core and monolithic plate, in terms of their permanent deflections and damage degrees. The finding of this research provides a valuable insight into the engineering design of sandwich constructions against air blast loads.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349697
|
oai_dc
|
Effect of design parameters on the anti-penetration properties of space armor
|
Effect of design parameters on the anti-penetration properties of space armor
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tso-Liang Teng(Da-Yeh University); Ta-Ming Shih(Chung Cheng Institute of Technology); Cheng-Chung Lu(Chung Cheng Institute of Technology)"
] |
New types of armor, including space armor, multiple-layered armor, composite armor and modular armor have been successfully developed and installed on the armored vehicles of several nations. The protective capability of armor against penetration is established. Of developed composite armor, space
armor has a simple structure and is easy to produce and can be produced at low cost. This study uses the finite element package DYTRAN and the pre and post processor PNTRAN to elucidate the ballistic resistance and penetration of space armor. Factors such as armor thickness, space between armors and projectile profile are considered. A technique for simulating the protection afforded by armor and supporting the design of space armor is developed.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349693
|
oai_dc
|
An effective solution of electro-thermo-structural problem of uni-axially graded material
|
An effective solution of electro-thermo-structural problem of uni-axially graded material
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. Murín(Slovak University of Technology); V. Kutis(Slovak University of Technology,); M. Masny(Slovak University of Technology)"
] |
The aim of this contribution is to present a new link/beam finite element suitable for electrothermo-structural analysis of uni-axially graded materials. Continuous polynomial variation of geometry and material properties will be considered. The element matrix and relations for solution of Joule’s heat
(and its distribution to the element nodes) have been established in the sense of a sequence method of a coupled problem solution. The expression for the solution of nodal forces caused by a continuously distributed temperature field has also been derived. The theoretical part of this contribution is completed by numerical validation, which proves the high accuracy and effectiveness of the proposed element. The results of the performed experiments are compared with those obtained using the more expensive multiphysical link element and solid element of the FEM program Ansys. The proposed finite element could be used not only in the multiphysical analysis of the current paths and actuators but also in analysis
of other 1D construction parts made of composite or uni-axially graded materials.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349855
|
oai_dc
|
The unsymmetric finite element formulation and variational incorrectness
|
The unsymmetric finite element formulation and variational incorrectness
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Rajendran(Nanyang Tech. University)"
] |
토목공학
| null |
kci_detailed_000082.xml
|
||||
ART001349679
|
oai_dc
|
Free vibration analysis of a uniform beam carrying multiple spring-mass systems with masses of the springs considered
|
Free vibration analysis of a uniform beam carrying multiple spring-mass systems with masses of the springs considered
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jia-Jang Wu(National Kaohsiung Marine Univ.)"
] |
The reports regarding the free vibration analysis of uniform beams carrying single or multiple spring-mass systems are plenty, however, among which, those with inertia effect of the helical spring(s) considered are limited. In this paper, by taking the mass of the helical spring into consideration, the
stiffness and mass matrices of a spring-mass system and an equivalent mass that may be used to replace the effect of a spring-mass system are derived. By means of the last element stiffness and mass matrices, the natural frequencies and mode shapes for a uniform cantilever beam carrying any number of springmass systems (or loaded beam) are determined using the conventional finite element method (FEM). Similarly, by means of the last equivalent mass, the natural frequencies and mode shapes of the same
loaded beam are also determined using the presented equivalent mass method (EMM), where the cantilever beam elastically mounted by a number of lumped masses is replaced by the same beam rigidly attached by the same number of equivalent masses. Good agreement between the numerical results of FEM and those of EMM and/or those of the existing literature confirms the reliability of the presented approaches.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349676
|
oai_dc
|
Free vibration analysis of plates resting on elastic foundations using modified Vlasov model
|
Free vibration analysis of plates resting on elastic foundations using modified Vlasov model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yusuf Ayvaz(Karadeniz Technical University); Celal Burak O uzhan(12th Regional Directorate of State Hydraulic Works)"
] |
An application is presented of a modified Vlasov model to the free vibration analysis of plates resting on elastic foundations. The effects of the subsoil depth, the ratio of the plate dimensions, the ratio of the subsoil depth to the plate dimension in the longer direction, and the value of the vertical
deformation parameter within the subsoil on the frequency parameters of plates on an elastic foundation are investigated. This analysis has been caried out by the aid of a computer program. The first ten frequency parameters are presented in tabular and the graphical forms to evaluate the effects of the parameters considered in this study. Then mode shapes corresponding to the first six of the frequency parameters are given in graphs. It is concluded that the effect of the subsoil depth on the frequency
parameters of the plates on an elastic foundation is generally larger than those of the other parameters considered in this study.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349702
|
oai_dc
|
Comparative assessment of seismic rehabilitation techniques on a full scale 3-story RC moment frame structure
|
Comparative assessment of seismic rehabilitation techniques on a full scale 3-story RC moment frame structure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Di Ludovico(University of Naples Federico II); A. Balsamo(University of Naples Federico II); A. Prota(University of Naples Federico II); G. Manfredi(University of Naples Federico II)"
] |
In the framework of the SPEAR (Seismic PErformance Assessment and Rehabilitation) research Project, an under-designed three storey RC frame structure, designed to sustain only gravity loads, was subjected, in three different configurations ‘as-built’, Fiber Reinforced Polymer (FRP) retrofitted and rehabilitated by reinforced concrete (RC) jacketing, to a series of bi-directional pseudodynamic (PsD) tests under different values of peak ground acceleration (PGA) (from a minimum of 0.20g to a maximum of 0.30g). The seismic deficiencies exhibited by the ‘as-built’ structure after the test at
PGA level of 0.20g were confirmed by a post – test assessment of the structural seismic capacity performed by a nonlinear static pushover analysis implemented on the structure lumped plasticity model. To improve the seismic performance of the ‘as-built’ structure’, two rehabilitation interventions by using
either FRP laminates or RC jacketing were designed. Assumptions for the analytical modeling, design criteria and calculation procedures along with local and global intervention measures and their installation details are herein presented and discussed. Nonlinear static pushover analyses for the assessment of the theoretical seismic capacity of the structure in each retrofitted configuration were performed and compared with the experimental outcomes.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349704
|
oai_dc
|
Axisymmetric vibrations of layered cylindrical shells of variable thickness using spline function approximation
|
Axisymmetric vibrations of layered cylindrical shells of variable thickness using spline function approximation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K.K. Viswanathan(Inha University); 김경수(Inha University); 이장현(인하대학교); 이창현(인하대학교); 이재범(인하대학교)"
] |
Free axisymmetric vibrations of layered cylindrical shells of variable thickness are studied using spline function approximation techniques. Three different types of thickness variations are considered namely linear, exponential and sinusoidal. The equations of axisymmetric motion of layered cylindrical shells, on the longitudinal and transverse displacement components are obtained using Love’s first approximation theory. A system of coupled differential equations on displacement functions are obtained by assuming the displacements in a separable form. Then the displacements are approximated
using Bickley-spline approximation. The vibrations of two-layered cylindrical shells, made up of several types of layered materials and different boundary conditions are considered. Parametric studies have been made on the variation of frequency parameter with respect to the relative layer thickness, length ratio and type of thickness variation parameter.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349687
|
oai_dc
|
Design optimization of vibration isolation system through minimization of vibration power flow
|
Design optimization of vibration isolation system through minimization of vibration power flow
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shilin Xie(The Hong Kong Polytechnic University); Siu Wing Or(The Hong Kong Polytechnic University); Helen Lai Wa Chan(The Hong Kong Polytechnic University); Ping Kong Choy(ASM Assembly Automation Ltd.); Peter Chou Kee Liu(ASM Assembly Automation Ltd.)"
] |
A vibration power minimization model is developed, based on the mobility matrix method, for a vibration isolation system consisting of a vibrating source placed on an elastic support structure through multiple resilient mounts. This model is applied to investigate the design optimization of an X-Y motion stage-based vibration isolation system used in semiconductor wire-bonding equipment. By varying the stiffness coefficients of the resilient mounts while constraining the dynamic displacement amplitudes of the X-Y motion stage, the total power flow from the X-Y motion stage (the vibrating source) to the
equipment table (the elastic support structure) is minimized at each frequency interval in the concerned frequency range for different stiffnesses of the equipment table. The results show that when the equipment table is relatively flexible, the optimal design based on the proposed vibration power inimization model gives significantly little power flow than that obtained using a conventional vibration force minimization model at some critical frequencies. When the equipment table is rigid enough, both models provide almost the same predictions on the total power flow.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349599
|
oai_dc
|
Fatigue life prediction of horizontally curved thin walled box girder steel bridges
|
Fatigue life prediction of horizontally curved thin walled box girder steel bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K. Nallasivam(Indian Institute of Technology Guwahati-781039); Sudip Talukdar(Indian Institute of Technology Guwahati); Anjan Dutta(Indian Institute of Technology)"
] |
The fatigue damage accumulation rates of horizontally curved thin walled box-girder bridge have been estimated from vehicle-induced dynamic stress history using rain flow cycle counting method in the time domain approach. The curved box-girder bridge has been numerically modeled using computationally efficient thin walled box-beam finite elements, which take into account the important structural actions like torsional warping, distortion and distortional warping in addition to the conventional displacement and rotational degrees of freedom. Vehicle model includes heave-pitch-roll degrees of freedom with longitudinal and transverse input to the wheels. The bridge deck unevenness, which is taken as inputs to the vehicle wheels, has been assumed to be a realization of homogeneous random process
specified by a power spectral density (PSD) function. The linear damage accumulation theory has been applied to calculate fatigue life. The fatigue life estimated by cycle counting method in time domain has been compared with those found by estimating the PSD of response in frequency domain. The frequency domain method uses an analytical expression involving spectral moment characteristics of stress process. The effects of some of the important parameters on fatigue life of the curved box bridge have been studied.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349641
|
oai_dc
|
Use of moving substructure element for vibration analyses of a structure due to a moving trolley carrying a swinging mass
|
Use of moving substructure element for vibration analyses of a structure due to a moving trolley carrying a swinging mass
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jia-Jang Wu(National Kaohsiung Marine Univ.)"
] |
토목공학
| null |
kci_detailed_000082.xml
|
||||
ART001349635
|
oai_dc
|
A method for static and dynamic analyses of stiffened multi-bay coupled shear walls
|
A method for static and dynamic analyses of stiffened multi-bay coupled shear walls
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kanat Burak Bozdogan(Ege University); Duygu Ozturk(Ege University)"
] |
In this study an approximate method based on the continuum approach and transfer matrix method for static and dynamic analyses of stiffened multi-bay coupled shear walls is presented. In this method the whole structure is idealized as a sandwich beam. Initially the differential equation of this
equivalent sandwich beam is written then shape functions for each storey is obtained by the solution of differential equations. By using boundary conditions and storey transfer matrices which are obtained by
these shape functions, system modes and periods can be calculated. Reliability of the study is shown with a few examples. A computer program has been developed in MATLAB and numerical samples have been
solved for demonstration of the reliability of this method. The results of the samples show the agreement between the present method and the other methods given in literature.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349629
|
oai_dc
|
Strength buckling predictions of cold-formed steel built-up columns
|
Strength buckling predictions of cold-formed steel built-up columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Megnounif(Belkaid University of Tlemcen); M. Djafour(); A. Belarbi(Missouri University of Science and Technology); D. Kerdal(University of Sciences and Technology of Oran)"
] |
The aim of this paper is to propose a design procedure for predicting the buckling strength of built-up, cold-formed steel columns based on the two well known methods; the effective width method and the Direct Strength Method. Several design approaches, based on different elastic buckling solutions, were considered in this investigation. Traditional hand methods, without interaction effects between the different modes, and a new numerical spline finite strip method were used to predict the buckling stresses.
All of the proposed methods were compared with experimental data on plain and lipped, built-up columns. Results have shown that the effective width approaches are more accurate than the Direct Strength Method. However, both methods can be investigated using more experimental data to assess a
practical design method for built-up columns.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349592
|
oai_dc
|
Impact of uncertain natural vibration period on quantile of seismic demand
|
Impact of uncertain natural vibration period on quantile of seismic demand
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H.P. Hong(University of Western Ontario); S.S. Wang(University of Western Ontario); A.K.H. Kwan(University of Hong Kong)"
] |
This study investigates effect of uncertainty in natural vibration period on the seismic demand. It is shown that since this uncertainty affects the acceleration and displacement responses differently, two ratios, one relating peak acceleration responses and the other relating the peak displacement responses, are not equal and both must be employed in evaluating and defining the critical seismic demand. The evaluation of the ratios is carried out using more than 200 strong ground motion records. The results suggest that the uncertainty in the natural vibration period impacts significantly the
statistics of the ratios relating the peak responses. By using the statistics of the ratios, a procedure and sets of empirical equations are developed for estimating the probability consistent seismic demand for both linear and nonlinear systems.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349623
|
oai_dc
|
Near-fault ground motion effects on the nonlinear response of dam-reservoir-foundation systems
|
Near-fault ground motion effects on the nonlinear response of dam-reservoir-foundation systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Alemdar Bayraktar(Karadeniz Technical Univ.); Ahmet Can Altuni ik(Karadeniz Technical University); Baris Sevim(Karadeniz Technical University); Murat Emre Kartal(Zonguldak Karaelmas University); Temel Türker(Karadeniz Technical University,)"
] |
Ground motions in near source region of large crustal earthquakes are significantly affected by rupture directivity and tectonic fling. These effects are the strongest at longer periods and they can have a significant impact on Engineering Structures. In this paper, it is aimed to determine near-fault
ground motion effects on the nonlinear response of dams including dam-reservoir-foundation interaction. Four different types of dam, which are gravity, arch, concrete faced rockfill and clay core rockfill dams, are selected to investigate the near-fault ground motion effects on dam responses. The behavior of reservoir is taken into account by using Lagrangian approach. Strong ground motion records of Duzce (1999), Northridge (1994) and Erzincan (1992) earthquakes are selected for the analyses. Displacements,
maximum and minimum principal stresses are determined by using the finite element method. The displacements and principal stresses obtained from the four different dam types subjected to these nearfault strong-ground motions are compared with each other. It is seen from the results that near-fault
ground motions have different impacts on the dam types.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349595
|
oai_dc
|
Stochastic analysis of external and parametric dynamical systems under sub-Gaussian Lévy white-noise
|
Stochastic analysis of external and parametric dynamical systems under sub-Gaussian Lévy white-noise
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mario Di Paola(Viale delle Scienze); Antonina Pirrotta(Viale delle Scienze); Massimiliano Zingales(Viale delle Scienze)"
] |
In this study stochastic analysis of non-linear dynamical systems under α-stable,
multiplicative white noise has been conducted. The analysis has dealt with a special class of α-stable
stochastic processes namely sub-Gaussian white noises. In this setting the governing equation either of the
probability density function or of the characteristic function of the dynamical response may be obtained
considering the dynamical system forced by a Gaussian white noise with an uncertain factor with α/2-
stable distribution. This consideration yields the probability density function or the characteristic function
of the response by means of a simple integral involving the probability density function of the system
under Gaussian white noise and the probability density function of the α/2-stable random parameter. Some
numerical applications have been reported assessing the reliability of the proposed formulation. Moreover
a proper way to perform digital simulation of the sub-Gaussian α-stable random process preventing
dynamical systems from numerical overflows has been reported and discussed in detail.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001349633
|
oai_dc
|
J-integral calculation by domain integral technique using adaptive finite element method
|
J-integral calculation by domain integral technique using adaptive finite element method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sutthisak Phongthanapanich(King Mongkut’s University of Technology North Bangkok, Thailand); Kobsak Potjananapasiri(Chulalongkorn University); Pramote Dechaumphai(Chulalongkorn University, Thailand)"
] |
An adaptive finite element method for analyzing two-dimensional and axisymmetric nonlinear elastic fracture mechanics problems with cracks is presented. The J-integral is used as a parameter to characterize the severity of stresses and deformation near crack tips. The domain integral technique, for
which all relevant quantities are integrated over any arbitrary element areas around the crack tips, is utilized as the J-integral solution scheme with 9-node degenerated crack tip elements. The solution accuracy is further improved by incorporating an error estimation procedure onto a remeshing algorithm with a solution mapping scheme to resume the analysis at a particular load level after the adaptive remeshing technique has been applied. Several benchmark problems are analyzed to evaluate the efficiency of the combined domain integral technique and the adaptive finite element method.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358140
|
oai_dc
|
Validity of simplified analysis for the stability of laminated composite stiffened panels subjected to in-plane shear
|
Validity of simplified analysis for the stability of laminated composite stiffened panels subjected to in-plane shear
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Upendra K. Mallela(Indian Institute of Technology Roorkee); Akhil Upadhyay(Indian Institute of Technology Roorkee)"
] |
토목공학
| null |
kci_detailed_000082.xml
|
||||
ART001358139
|
oai_dc
|
Probabilistic seismic hazard assessment of Sanandaj, Iran
|
Probabilistic seismic hazard assessment of Sanandaj, Iran
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gholamreza Ghodrati Amiri(Iran University of Science & Technology); Kaveh Andisheh(University of Kurdistan); Seyed Ali Razavian Amrei(Iran University of Science & Technology)"
] |
In this paper, the peak horizontal ground acceleration over the bedrock (PGA) is calculated by a probabilistic seismic hazard assessment (PSHA). For this reason, at first, all the occurred earthquakes in a radius of 200 km of Sanandaj city have been gathered. After elimination of the aftershocks and foreshocks, the main earthquakes were taken into consideration to calculate the seismic parameters (SP) by Kijko (2000) method. The seismotectonic model of the considered region and the seismic sources of the region have been modeled. In this research, Sanandaj and its vicinity has been meshed as an 8 (vertical lines) * 10 (horizontal lines) and the PGA is calculated for each point of the mesh using the logic tree method and the five attenuation relationships (AR) with different weighted coefficient. These calculations have been performed by the Poisson distribution of four hazard levels. Then by using it, four regional maps of the seismic hazard regions have been provided for Sanandaj and its vicinity. The results show that the maximum and minimum value of PGA for the return periods of 75, 225, 475, 2475 years are (0.114, 0.074) (0.157, 0.101), (0.189, 0.121) and (0.266, 0.170), respectively.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358132
|
oai_dc
|
Central angle effect on connection behavior of steel box beam-to-circular column
|
Central angle effect on connection behavior of steel box beam-to-circular column
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"황원섭(인하대학교); 윤태양(RIST); 김영필((주)유신코퍼레이션)"
] |
This paper presents the experimental results on the strength behavior and failure modes of box beam-to-circular column connections in steel piers. Previous research introduced parameters such as joint central angles, extension of horizontal stiffeners, and use of equivalent web depth, which ignored strength behavior and failure modes of box beam-to-circular column connections. The use of equivalent web depth d2 is not reasonable when central angle α is closer to 90o; therefore, a monotonic loading test has been performed for eight connection specimens. From the test, it is identified that the connection with the circular column is stronger than the connection with the box-sectioned substitution column. Also, the strength of the beam-to-column connections with horizontal stiffeners is higher than the one of the no
column stiffeners. The concrete-filled effect of box beam-to-circular column connection is also investigated, and the experimental yield strength of the connection is compared with the theoretical one. Also, more a
reasonable equivalent web depth is suggested. The failure modes of connection are clearly defined.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358103
|
oai_dc
|
Evaluation of slip coefficient of slip critical joints with high strength bolts
|
Evaluation of slip coefficient of slip critical joints with high strength bolts
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"나환선(한국전력공사); 이현주(한국전력공사); 김강석(한국전력공사); 김우범(공주대학교)"
] |
A slip critical joint has various values to adopt the proper slip coefficient in various conditions of faying surfaces in the following codes: AISC, AIJ and Eurocode 3. However, the Korean Building Code still regulates the unique slip coefficient, 0.45, regardless of the diverse faying conditions. In this study, the slip resistance test, including five kinds of surface treatments were conducted to obtain the proper slip coefficients available to steel plate KS SM490A. The faying surfaces were comprised of a clean mill, rust, red lead paint, zinc primer, and shot blast treatment. The candidates for high strength
bolts were torque-shear bolts, torque-shear bolts with zinc coating, and ASTM A490 bolts. Based on the test results, the specimens with a shot blasted surface and rusted surface exhibited ks, 0.61, and 0.5,
respectively. It is recommended that the specimens with zinc primer exhibit ks
≥ 0.40. The clean mill treated surface had prominently lower values, 0.27. For red lead painted treatment, the thickness of the coating affects the determinant of slip coefficient, so it is necessary to establish a minimum ks of 0.2, with
a coating thickness of 65 μm. During 1,000 hours of relaxation, the uncoated surfaces exhibited the loss of clamping force behind 3%, while the coated surfaces within a certain limited thickness exhibited the loss of clamping within a range of 4.71% and 8.37%.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358112
|
oai_dc
|
A comparative analysis of structural damage detection techniques by wavelet, kurtosis and pseudofractal methods
|
A comparative analysis of structural damage detection techniques by wavelet, kurtosis and pseudofractal methods
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vikram Pakrashi(Roughan & O’Donovan Consulting Engineers); Alan O’Connor(Trinity College Dublin); Biswajit Basu(Trinity College Dublin)"
] |
The aim of this paper is to compare wavelet, kurtosis and pseudofractal based techniques for structural health monitoring in the presence of measurement noise. A detailed comparison and assessment of these techniques have been carried out in this paper through numerical experiments for the calibration of damage extent of a simply supported beam with an open crack serving as an illustrative example. The numerical experiments are deemed critical due to limited amount of experimental data available in the field of singularity based detection of damage. A continuous detectibility map has been proposed for comparing various techniques qualitatively. Efficiency surfaces have been constructed for wavelet, kurtosis and pseudofractal based calibration of damage extent as a function of damage location and measurement noise level. Levels of noise have been identified for each technique where a sudden drop of calibration efficiency is observed marking the onset of damage masking regime by measurement noise.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358118
|
oai_dc
|
Large deflections of spatial variable-arc-length elastica under terminal forces
|
Large deflections of spatial variable-arc-length elastica under terminal forces
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Boonchai Phungpaingam(King Mongkut’s University of Technology); Chainarong Athisakul(King Mongkut’s University of Technology); Somchai Chucheepsakul(King Mongkut’s University of Technology)"
] |
This paper aims to study the large deflections of variable-arc-length elastica subjected to the terminal forces (e.g., axial force and torque). Based on Kirchhoff’s rod theory and with help of Euler parameters, the set of nonlinear governing differential equations which free from the effect of singularity are established together with boundary conditions. The system of nonlinear differential equations is solved by using the shooting method with high accuracy integrator, seventh-eighth order Runge-Kutta with adaptive step-size scheme. The error norm of end conditions is minimized within the prescribed tolerance (10.5). The behavior of VAL elastica is studied by two processes. One is obtained by applying slackening first. After that keeping the slackening as a constant and then the twist angle is varied in subsequent
order. The other process is performed by reversing the sequence of loading in the first process. The results are interpreted by observing the load-deflection diagram and the stability properties are predicted via fold rule. From the results, there are many interesting aspects such as snap-through phenomenon, secondary bifurcation point, loop formation, equilibrium configurations and effect of variable-arc-length to behavior of elastica.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358138
|
oai_dc
|
Numerical experiments on the determination of stress concentration factors in orthotropic perforated plates subjected to in - plane loading
|
Numerical experiments on the determination of stress concentration factors in orthotropic perforated plates subjected to in - plane loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"D.V. Bambill(Universidad Nacional del Sur); C.A. Rossit(Universidad Nacional del Sur); A. Susca(Universidad Nacional del Sur)"
] |
As it is known, laminated composite materials are increasingly used in many technological applications, and in some instance, cutouts must be made into laminated panels for practical reasons, changing the stress distribution. The present study deals with the determination of the stress concentration factor that holes of square shape cause in an orthotropic plate subjected to distributed in . plane loading. Square holes of rounded corners in a rectangular plate are considered, and the effect of different combinations of axial and tangential forces applied to its middle plane at the external edges, is studied. The mutually perpendicular axes, which define the principal axes of orthotropy, are assumed in many different directions referred to the sides of the plate. Numerical experiments by means of a finite element code is performed, evaluating the influence of the fiber orientation with respect to the edges of the plate and the characteristics of the orthotropic materials since such structures do not exhibit easily predictable behavior.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001358124
|
oai_dc
|
Vibration mitigation of guyed masts via tuned pendulum dampers
|
Vibration mitigation of guyed masts via tuned pendulum dampers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Walter Lacarbonara(Sapienza University of Rome); Stefano Ballerini(Sapienza University of Rome)"
] |
A passive vibration mitigation architecture is proposed to damp transverse vibrations of guyed masts. The scheme is based on a number of pendula attached to the mast and tuned to the vibration modes to be controlled. This scheme differs from the well-known autoparametric pendulum absorber system. The equations of motion of the guyed mast with an arbitrary number of pendula are obtained. The leading bending behaviour of a typical truss mast is described by an equivalent beam model whereas the guys are conveniently modeled as equivalent transverse springs whose stiffness comprises the
elastic and geometric stiffness. By assuming a mast with an inertially and elastically isotropic crosssection, a planar model of the guyed mast is investigated. The linearization of the equations of motion of the mast subject to a harmonic distributed force leads to the transfer functions of the structure without the dampers and with the dampers. The transfer functions allow to investigate the mitigation effects of the pendula. By employing one pendulum only, tuned to the frequency of the lowest mode, the effectiveness of the passive vibration potential in reducing the motion and acceleration of the top section of the mast is demonstrated.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470843
|
oai_dc
|
Stochastic analysis of fluid-structure interaction systems by Lagrangian approach
|
Stochastic analysis of fluid-structure interaction systems by Lagrangian approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Alemdar Bayraktar(Karadeniz Technical University); Ebru Hançer(Karadeniz Technical University)"
] |
In the present paper it is aimed to perform the stochastic dynamic analysis of fluid and fluidstructure systems by using the Lagrangian approach. For that reason, variable-number-nodes twodimensional isoparametric fluid finite elements are programmed in Fortran language by the authors and incorporated into a general-purpose computer program for stochastic dynamic analysis of structure systems, STOCAL. Formulation of the fluid elements includes the effects of compressible wave propagation and surface sloshing motion. For numerical example a rigid fluid tank and a dam-reservoir
interaction system are selected and modeled by finite element method. Results obtained from the modal analysis are compared with the results of the analytical and numerical solutions. The Pacoima Dam record S16E component recorded during the San Fernando Earthquake in 1971 is used as a ground motion. The mean of maximum values of displacements and hydrodynamic pressures are compared with the deterministic analysis results.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470857
|
oai_dc
|
Added effect of uncertain geometrical parameter on the response variability of Mindlin plate
|
Added effect of uncertain geometrical parameter on the response variability of Mindlin plate
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hyuk Chun Noh(Columbia University); Chang Koon Choi(Korea Advanced Institute of Science and Technology)"
] |
In case of Mindlin plate, not only the bending deformation but also the shear behavior is allowed. While the bending and shear stiffness are given in the same order in terms of elastic modulus, they are in different order in case of plate thickness. Accordingly, bending and shear contributions have to
be dealt with independently if the stochastic finite element analysis is performed on the Mindlin plate taking into account of the uncertain plate thickness. In this study, a formulation is suggested to give the response variability of Mindlin plate taking into account of the uncertainties in elastic modulus as well as in the thickness of plate, a geometrical parameter, and their correlation. The cubic function of thickness and the correlation between elastic modulus and thickness are incorporated into the formulation by means
of the modified auto- and cross-correlation functions, which are constructed based on the general formula for n-th joint moment of random variables. To demonstrate the adequacy of the proposed formulation, a plate with various boundary conditions is taken as an example and the results are compared with those obtained by means of classical Monte Carlo simulation.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470845
|
oai_dc
|
Efficient geometric nonlinear analyses of circular plate bending problems
|
Efficient geometric nonlinear analyses of circular plate bending problems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mei Duan(The University of New South Wales)"
] |
In this paper, a hybrid/mixed nonlinear shell element is developed in polar coordinate system based on Hellinger/Reissner variational principle and the large-deflection theory of plate. A numerical solution scheme is formulated using the hybrid/mixed finite element method (HMFEM), in which the nodal values of bending moments and the deflection are the unknown discrete parameters. Stability of the present element is studied. The large-deflection analyses are performed for simple supported and clamped circular plates under uniformly distributed and concentrated loads using HMFEM and the traditional displacement finite element method. A parametric study is also conducted in the research. The accuracy of the shell element is investigated using numerical computations. Comparisons of numerical solutions are
made with theoretical results, finite element analysis and the available numerical results. Excellent agreements are shown.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470854
|
oai_dc
|
Free vibration of orthotropic functionally graded beams with various end conditions
|
Free vibration of orthotropic functionally graded beams with various end conditions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chao-Feng Lü(Zhejiang University); W. Q. Chen(Zhejiang University)"
] |
Free vibration of orthotropic functionally graded beams, whose material properties can vary arbitrarily along the thickness direction, is investigated based on the two-dimensional theory of elasticity. A hybrid state space/differential quadrature method is employed along with an approximate laminate model, which allows us to obtain the semi-analytical solution easily. With the introduction of continuity conditions at each fictitious interface and boundary conditions at the top and bottom surfaces, the frequency equation for an inhomogeneous beam is derived. A completely exact solution of an FGM beam with material constants varying in exponential way through the thickness is also presented, which serves a benchmark to verify the present method. Numerical results are performed and discussed.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470848
|
oai_dc
|
Numerical studies on the effects of the lateral boundary on soil-structure interaction in homogeneous soil foundations
|
Numerical studies on the effects of the lateral boundary on soil-structure interaction in homogeneous soil foundations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Z. N. Li(Hunan University); Q. S. Li(City University of Hong Kong); M. L. Lou(Tongji University)"
] |
In this paper, the finite element method is applied to investigate the effect of the lateral boundary in homogenous soil on the seismic response of a superstructure. Some influencing factors are presented and discussed, and several parameters are identified to be important for conducting soil-structure
interaction experiments on shaking tables. Numerical results show that the cross-section width L, thickness H, wave propagation velocity and lateral boundaries of soil layer have certain influences on the computational accuracy. The dimensionless parameter L/H is the most significant one among the influencing factors. In other words, a greater depth of soil layer near the foundation should be considered in shaking table tests as the thickness of the soil layer increases, which can be regarded as a linear
relationship approximately. It is also found that the wave propagation velocity in soil layer affects the numerical accuracy and it is suggested to consider a greater depth of the soil layer as the wave propagation velocity increases. A numerical study on a soil-structure experimental model with a rubber ring surrounding the soil on a shaking table is also conducted. It is found the rubber ring has great effect on the soil-structure interaction experiments on shaking table. The experimental precision can be improved by reasonably choosing the elastic parameter and width of the rubber ring.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470850
|
oai_dc
|
Dynamic instability of functionally graded material plates subjected to aero-thermo-mechanical loads
|
Dynamic instability of functionally graded material plates subjected to aero-thermo-mechanical loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"T. Prakash(Indian Institute of Technology Delhi); M. Ganapathi(Institute of Armament Technology)"
] |
Here, the dynamic instability characteristics of aero-thermo-mechanically stressed functionally graded plates are investigated using finite element procedure. Temperature field is assumed to be a uniform distribution over the plate surface and varied in thickness direction only. Material properties are
assumed to be temperature dependent and graded in the thickness direction according to simple power law distribution. For the numerical illustrations, silicon nitride/stainless steel is considered as functionally graded material. The aerodynamic pressure is evaluated based on first-order high Mach number approximation to the linear potential flow theory. The boundaries of the instability region are obtained using the principle of Bolotin’s method and are convenienty represented in the non-dimensional excitation frequency-load amplitude plane. The variation dynamic instability width is highlighted considering various parameters such as gradient index, temperature, aerodynamic and mechanical loads, thickness and aspect ratios, and boundary condition.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470851
|
oai_dc
|
Transient energy flow in ship plate and shell structures under low velocity impact
|
Transient energy flow in ship plate and shell structures under low velocity impact
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Z. S. Liu(Institute of High Performance Computing); S. Swaddiwudhipong(National University of Singapore); C. Lu(Institute of High Performance Computing); J. Hua(National University of Singapore)"
] |
Structural members commonly employed in marine and off-shore structures are usually fabricated from plates and shells. Collision of this class of structures is usually modeled as plate and shell structures subjected to dynamic impact loading. The understanding of the dynamic response and energy transmission of the structures subjected to low velocity impact is useful for the efficient design of this type of structures. The transmissions of transient energy flow and dynamic transient response of these structures under low velocity impact are presented in the paper. The structural intensity approach is adopted to study the elastic transient dynamic characteristics of the plate structures under low velocity impact. The nine-node degenerated shell elements are adopted to model both the target and impactor in the dynamic impact response analysis. The structural intensity streamline representation is introduced to interpret energy flow paths for transient dynamic response of the structures. Numerical results, including contact force and transient energy flow vectors as well as structural intensity stream lines, demonstrate the efficiency of the present approach and attenuating impact effects on this type of structures.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470884
|
oai_dc
|
Dynamic interaction analysis of vehicle-bridge system using transfer matrix method
|
Dynamic interaction analysis of vehicle-bridge system using transfer matrix method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tianyu Xiang(Southwest Jiaotong University); Renda Zhao(Southwest Jiaotong University)"
] |
The dynamic interaction of vehicle-bridge is studied by using transfer matrix method in this paper. The vehicle model is simplified as a spring-damping-mass system. By adopting the idea of Newmark-β method, the partial differential equation of structure vibration is transformed into a differential
equation irrelevant to time. Then, this differential equation is solved by transfer matrix method. The prospective application of this method in real engineering is finally demonstrated by several examples.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470865
|
oai_dc
|
Seismic response and failure modes for a water storage structure − A case study
|
Seismic response and failure modes for a water storage structure − A case study
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kapilesh Bhargava(Bhabha Atomic Research Centre); A. K. Ghosh(Bhabha Atomic Research Centre); S. Ramanujam(Bhabha Atomic Research Centre)"
] |
The present paper deals with the seismic response analysis and the evaluation of most likely failure modes for a water storage structure. For the stress analysis, a 3-D mathematical model has been adopted to represent the structure appropriately. The structure has been analyzed for both static and
seismic loads. Seismic analysis has been carried out considering the hydrodynamic effects of the contained water. Based on the stress analyses results, the most likely failure modes viz. tensile cracking and compressive crushing of concrete for the various structural elements; caused by the seismic event have been investigated. Further an attempt has also been made to quantify the initial leakage rate and average emptying time for the structure during seismic event after evaluating the various crack parameters viz. crack-width and crack-spacing at the locations of interest. The results are presented with reference to peak ground acceleration (PGA) of the seismic event. It has been observed that, an increase in PGA would result in significant increase in stresses and crack width in the various structural members. Significant increase in initial leakage rate and decrease in average emptying time for the structure has also been observed with the increase in PGA.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470885
|
oai_dc
|
An approach for failure analysis of composite bridge deck systems with openings
|
An approach for failure analysis of composite bridge deck systems with openings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lei Zhao(University of Central Florida); Vistasp M. Karbhari(University of California San Diego)"
] |
Design details pertaining to the connection between some recently developed fiber reinforced polymer (FRP) composite deck systems and the supporting girders require openings through cells of the deck. This significantly changes the stress distribution in these components. As a result, the conventional
assumptions that deck designs are controlled by their stiffness, and not strength, needs a closer examination. This paper proposes an analytical method to investigate the stress states and failure mechanisms using a type of “global-local” modeling perspective, incorporating classical lamination theory and first ply failure criterion with use of appropriate stress concentration factors around the cutouts. The use of a “smeared-stress” approach is presented as a potential means of simplifying certain FRP specific
complexities, while still enabling prediction of overall failure.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470876
|
oai_dc
|
Shear modulus and stiffness of brickwork masonry: An experimental perspective
|
Shear modulus and stiffness of brickwork masonry: An experimental perspective
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vlatko Z. Bosiljkov(Slovenian National Building and Civil Engineering Institute (ZAG)); Yuri Z. Totoev(University Drive); John M. Nichols(Texas A&M University)"
] |
Masonry is a composite non-homogeneous structural material, whose mechanical properties depend on the properties of and the interaction between the composite components − brick and mortar, their volume ratio, the properties of their bond, and any cracking in the masonry. The mechanical
properties of masonry depend on the orientation of the bed joints and the stress state of the joints, and so the values of the shear modulus, as well as the stiffness of masonry structural elements can depend on various factors. An extensive testing programme in several countries addresses the problem of
measurement of the stiffness properties of masonry. These testing programs have provided sufficient data to permit a review of the influence of different testing techniques (mono and bi-axial tests), the variations caused by distinct loading conditions (monotonic and cyclic), the impact of the mortar type, as well as influence of the reinforcement. This review considers the impact of the measurement devices used for determining the shear modulus and stiffness of walls on the results. The results clearly indicate a need to re-assess the values stated in almost all national codes for the shear modulus of the masonry, especially for masonry made with lime mortar, where strong anisotropic behaviour is in the stiffness properties.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470883
|
oai_dc
|
Statistical models from weigh-in-motion data
|
Statistical models from weigh-in-motion data
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tommy H.T. Chan(The Hong Kong Polytechnic University); T. J. Miao(The Hong Kong Polytechnic University); Demeke B. Ashebo(The Hong Kong Polytechnic University)"
] |
This paper aims at formulating various statistical models for the study of a ten year Weighin-Motion (WIM) data collected from various WIM stations in Hong Kong. In order to study the bridge live load model it is important to determine the mathematical distributions of different load affecting parameters such as gross vehicle weights, axle weights, axle spacings, average daily number of trucks etc. Each of the above parameters is analyzed by various stochastic processes in order to obtain the mathematical distributions and the Maximum Likelihood Estimation (MLE) method is adopted to calculate the statistical parameters, expected values and standard deviations from the given samples of data. The Kolmogorov-Smirnov (K-S) method of approach is used to check the suitability of the statistical model selected for the particular parameter and the Monte Carlo method is used to simulate the distributions of maximum value stochastic processes of a series of given stochastic processes. Using the statistical analysis approach the maximum value of gross vehicle weight and axle weight in bridge design life has been determined and the distribution functions of these parameters are obtained under both free-flowing traffic
and dense traffic status. The maximum value of bending moments and shears for wide range of simple spans are obtained by extrapolation. It has been observed that the obtained maximum values of the gross vehicle weight and axle weight from this study are very close to their legal limitations of Hong Kong which are 42 tonnes for gross weight and 10 tonnes for axle weight.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470879
|
oai_dc
|
‘Modularised’ Closed-Form Mathematical model for predicting the bracing performance of plasterboard clad walls
|
‘Modularised’ Closed-Form Mathematical model for predicting the bracing performance of plasterboard clad walls
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y. L. Liew(The University of Melbourne); E. F. Gad(Swinburne University of Technology); C. F. Duffield(Melbourne University Private)"
] |
This paper presents a new approach to predict the racking load-displacement response of plasterboard clad walls found in Australian light-framed residential structures under monotonic racking load. The method is based on a closed-form mathematical model, described herein as the ‘Modularised’
Closed-Form Mathematical model or MCFM model. The model considers the non-linear behaviour of the connections between the plasterboard cladding and frame. Furthermore, the model is flexible as it enables incorporation of different nailing patterns for the cladding. Another feature of this model is that the shape of stud deformation is not assumed to be a specific function, but it is computed based on the strain energy approach to take account of the actual load deformation characteristics of particular walls. Verification of the model against the results obtained from a detailed Finite Element (FE) model is also reported. Very good agreement between the closed form solution and that of the FE model was achieved.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470881
|
oai_dc
|
The buried arch structural system for underground structures
|
The buried arch structural system for underground structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Enrique Hernández-Montes(University of Granada); Mark Aschheim(Santa Clara University); Luisa María Gil-Martín(University of Granada)"
] |
In many cases, underground structures are built using conventional above-grade structural systems to carry gravity load. This paper proposes the use of underground arches, termed “buried arches”, to support gravity loads, wherein the horizontal thrust of the arch is equilibrated by soil pressure. Because the horizontal soil pressure increases with depth, the depth of the arch may be reduced as the depth below grade increases. Critical to the success of such an approach is a proper accounting of creep and shrinkage
for arches made of reinforced concrete. This paper addresses the influence of equilibrium, creep, and shrinkage as they affect the design of the arch from a theoretical perspective. Several examples illustrate the use of buried arches for the design of underground parking structures.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115398
|
oai_dc
|
Large deflection behavior of a flexible circular cantilever arc device subjected to inward or outward polar force
|
Large deflection behavior of a flexible circular cantilever arc device subjected to inward or outward polar force
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Samir Z. Al-Sadder(Hashemite Univ.)"
] |
The problem of very large deflection of a circular cantilever arc device subjected to inward or
outward polar force is studied. An exact elliptic integral solution is derived for the two cases and the
results are checked using large displacement finite element analysis via the ANSYS package by performing
a new novel modeling simulation technique for this problem. Excellent agreements have been obtained
between the exact analytical solution and the numerical approach. From this study, a design chart for
engineers is developed to predict the required value for the inward polar force for the device to switch on
for a given angle forming the circular arc (θo). This study has several interesting applications in mechanical
engineering, integrated circuit technology, nanotechnology and especially in microelectromechanical systems
(MEMs) such as a MEM circular device switch subjected to attractive or repulsive magnetic forces due to
the attachments of two magnetic poles at the fixed and at the free end of the circular cantilever arc switch
device.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115396
|
oai_dc
|
An optimal regularization for structural parameter estimation from modal response
|
An optimal regularization for structural parameter estimation from modal response
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Thanyawat Pothisiri(Chulalongkorn Univ.)"
] |
Solutions to the problems of structural parameter estimation from modal response using least-squares minimization of force or displacement residuals are generally sensitive to noise in the responsemeasurements. The sensitivity of the parameter estimates is governed by the physical characteristics of thecan be used to reduce effects of the measurement noise on the estimation error through adding aregularization function to the parameter estimation objective function. In this paper, we adopt theregularization function as the Euclidean norm of the difference between the values of the curentlyestimated parameters and the a priori parameter estimates. The effect of the regularization function on theoutcome of parameter estimation is determined by a regularization factor. Based on a singular valuedecomposition of the sensitivity matrix of the structural response, it is shown that the optimalregularization factor is obtained by using the maximum singular value of the sensitivity matrix. Thisselection exhibits the condition where the effect of the a prioriestimation problem is minimal. The performance of the proposed algorithm is investigated in comparisonwith certain algorithms selected from the literature by using a numerical example.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115399
|
oai_dc
|
Experimental study and modeling of masonry-infilled concrete frames with and without CFRP jacketing
|
Experimental study and modeling of masonry-infilled concrete frames with and without CFRP jacketing
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chao-Hsun Huang(Nat. Taipei Univ. of Technol.); Yu-Chi Sung(Nat. Taipei Univ. of Technol.); Chi-Hsin Tsai(Futai Engineering Co.)"
] |
Most existing concrete structures in Taiwan are considered nonductile due to insufficient
transverse reinforcement and poor detailing of frame elements. Such features are fairly typical for
buildings constructed prior to 1997, at which time the local building code was revised based on ACI 318-
95. Among these structures, many contain perimeter or partition walls made of concrete or clay brick for
architectural purposes. These walls, though treated as non-structural components in common design
practice, could affect the structural behavior of the buildings during an earthquake. To study the behavior
of such structures under seismic load, experiments were conducted on concrete frames of various
configurations to show the force-deformation relationships, damage patterns, and other characteristics of
the frames. For further interest, similar units with columns jacketed by carbon-fiber-reinforced-polymer
(CFRP) were also tested to illustrate the effectiveness of this technique in the retrofit of concrete frames.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115442
|
oai_dc
|
Dynamic instability analysis of laminated composite stiffened shell panels subjected to in-plane harmonic edge loading
|
Dynamic instability analysis of laminated composite stiffened shell panels subjected to in-plane harmonic edge loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. N. Patel(I.I.T. Kharagpur); P. K. Datta(I.I.T. Kharagpur); A. H. Sheikh(I.I.T. Kharagpur)"
] |
The dynamic instability characteristics of laminated composite stiffened shell panels subjected
to in-plane harmonic edge loading are investigated in this paper. The eight-noded isoparametric
degenerated shell element and a compatible three-noded curved beam element are used to model the shell
panels and the stiffeners respectively. As the usual formulation of degenerated beam element is found to
overestimate the torsional rigidity, an attempt has been made to reformulate it in an efficient manner.
Moreover the new formulation for the beam element requires five degrees of freedom per node as that of
shell element. The method of Hill’s infinite determinant is applied to analyze the dynamic instability
regions. Numerical results are presented to demonstrate the effects of various parameters like shell
geometry, lamination scheme, stiffening scheme, static and dynamic load factors and boundary conditions,
on the dynamic instability behaviour of laminated composite stiffened panels subjected to in-plane
harmonic loads along the boundaries. The results of free vibration and buckling of the laminated
composite stiffened curved panels are also presented.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115397
|
oai_dc
|
Behaviors of box-shape steel reinforced concrete composite beam
|
Behaviors of box-shape steel reinforced concrete composite beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chun Yang(South China Univ. of Tech.); Jian Cai(South China Univ. of Tech.); Yi Wu(Guangzhou Univ.); Jiangang He(Guangzhou Civil Arch. Res. & Design Inst.); Haifeng Chen(Guangzhou Civil Arch. Res. & Design Inst.)"
] |
Experimental studies on the behaviors of box-shape steel reinforced concrete (SRC)composite beams were conducted. Seven 1:3 scale model composite beams were tested to failure. Each ofspan and two-thirds span respectively. Experimental results indicate that the flexural strength can beenhanced when the ratio of flexural reinforcements and flange thickness of the shape steel are increased;the shear strength is enhanced with increase of web thickness of the shape steel. Insignificant effects ofbox-shape SRC composite beams, thus concrete inside the box-shape steel can be saved, and the weightof the SRC beams can be decreased. Shear studs can strengthen the connection and co-work effectsbetween the shape steel and the concrete and enhance the shear strength, but stud design for thebeams are proposed, and the calculated results are in good agrement with the experimental results. Ingeneral, the box-shape SRC composite beam is a kind of ductile member, and suitable for extensiveengineering application.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001115441
|
oai_dc
|
Stationary random response analysis of linear fuzzy truss
|
Stationary random response analysis of linear fuzzy truss
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. Ma,(Xidian Univ.); J. J. Chen(Xidian Univ.); W. Gao(The Univ. of New South Wales); Y. Y.Zhao(Xidian Univ.)"
] |
A new method called fuzzy factor method for the stationary stochastic response analysis of
fuzzy truss with global fuzzy structural parameters is presented in this paper. Considering the fuzziness of
the structural physical parameters and geometric dimensions simultaneously, the fuzzy correlation function
matrix of structural displacement response in time domain is derived by using the fuzzy factor method
and the optimization method, the fuzzy mean square values of the structural displacement and stress
response in the frequency domain are then developed with the fuzzy factor method. The influences of the
fuzziness of structural parameters on the fuzziness of mean square values of the displacement and stress
response are inspected via an example and some important conclusions are obtained. Finally, the example
is simulated by Monte-Carlo method and the results of the two methods are close, which verified the
feasibility of the method given in this paper.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001001887
|
oai_dc
|
Application of force-resultant models to the analysis of offshore pipelines
|
Application of force-resultant models to the analysis of offshore pipelines
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mark Jason Cassidy(The Univ. of Western Australia)"
] |
토목공학
| null |
kci_detailed_000082.xml
|
||||
ART001470729
|
oai_dc
|
Modal and structural identification of a R.C. arch bridge
|
Modal and structural identification of a R.C. arch bridge
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C. Gentile(Politecnico di Milano)"
] |
The paper summarizes the dynamic-based assessment of a reinforced concrete arch bridge, dating back to the 50’s. The outlined approach is based on ambient vibration testing, output-only modal identification and updating of the uncertain structural parameters of a finite element model. The Peak
Picking and the Enhanced Frequency Domain Decomposition techniques were used to extract the modal parameters from ambient vibration data and a very good agreement in both identified frequencies and mode shapes has been found between the two techniques. In the theoretical study, vibration modes were determined using a 3D Finite Element model of the bridge and the information obtained from the field tests combined with a classic system identification technique provided a linear elastic updated model, accurately fitting the modal parameters of the bridge in its present condition. Hence, the use of outputonly modal identification techniques and updating procedures provided a model that could be used to evaluate the overall safety of the tested bridge under the service loads.
|
토목공학
| null |
kci_detailed_000082.xml
|
|||
ART001470726
|
oai_dc
|
Analysis of 3D wall building structures dynamic response
|
Analysis of 3D wall building structures dynamic response
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"T. Chyzy(Bialystok University of Technology); J. Kretowska(Bialystok University of Technology); Cz. Miedzialowski(Bialystok University of Technology)"
] |
Three-dimensional description of building structure taking into consideration soil-structure interaction is a very complex problem and solution of this problem is often obtained by using finite element method. However, this method takes a significant amount of computational time and memory.
Therefore, an efficient computational model based on subdivision of the structure into building elements such as wall and floor slab elements, plane and three-dimensional joints and lintels, that could provide accurate results with significantly reduced computational time, is proposed in this study for the analysis three-dimensional structures subjected to dynamic load. The examples prove the efficiency and the computing possibilities of the model.
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토목공학
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kci_detailed_000083.xml
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