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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Computational Structural Engineering Institute of Korea
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Journal DOI :
The Computational Structural Engineering Institute
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Volume & Issues
Volume 18, Issue 4 - Dec 2005
Volume 18, Issue 3 - Sep 2005
Volume 18, Issue 2 - Jun 2005
Volume 18, Issue 1 - Mar 2005
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The Petrov-Galerkin Natural Element Method : I. Concepts
Cho, Jin-Rae ; Lee , Hong-Woo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 18, issue 2, 2005, Pages 103~111
In this paper, a new meshfree technique which improves the numerical integration accuracy is introduced. This new method called thc Petrov-Galerkin natural clement method(PG-NEM) by authors is based on the Voronoi diagram and the Delaunay triangulation which is based on the same concept used lot conventional natural clement method called the Bubnov-Galerkin natural element method(BG-NEM). But, unlike the BG-NEM, the test basis function is differently chosen, based on the concept of Petrov-Galerkin, such that its support coincides exactly with a regular integration region in background mesh. Therefore, it is expected that the proposed technique ensures the remarkably improved numerical integration accuracy in comparison with the BG-NEM.
The Petrov-Galerkin Natural Element Method : II. Linear Elastostatic Analysis
Cho, Jin-Rae ; Lee, Hong-Woo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 18, issue 2, 2005, Pages 113~121
In order to resolve a common numerical integration inaccuracy of meshfree methods, we introduce an improved natural clement method called Petrov-Galerkin natural element method(PG-NEM). While Laplace basis function is being taken for the trial shape function, the test shape function in the present method is differently defined such that its support becomes a union of Delaunay triangles. This approach eliminates the inconsistency of tile support of integrand function with the regular integration domain, and which preserves both simplicity and accuracy in the numerical integration. In this paper, the validity of the PG-NEM is verified through the representative benchmark problems in 2-d linear elasticity. For the comparison, we also analyze the problems using the conventional Bubnov-Galerkin natural element method(BG-NEM) and constant strain finite clement method(CS-FEM). From the patch test and assessment on convergence rate, we can confirm the superiority of the proposed meshfree method.
The Petrov-Galerkin Natural Element Method : III. Geometrically Nonlinear Analysis
Cho, Jin-Rae ; Lee, Hong-Woo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 18, issue 2, 2005, Pages 123~131
According to ow previous study, we confirmed That the Petrov-Galerkin natural element method(PG-NEM) completely resolves the numerical integration inaccuracy in the conventional Bubnov-Galerkin natural element method(BG-NEM). This paper is an extension of PG-NEM to two-dimensional geometrically nonlinear problem. For the analysis, a linearized total Lagrangian formulation is approximated with the PS-NEM. At every load step, the grid points ate updated and the shape functions are reproduced from the relocated nodal distribution. This process enables the PG-NEM to provide more accurate and robust approximations. The representative numerical experiments performed by the test Fortran program, and the numerical results confirmed that the PG-NEM effectively and accurately approximates The large deformation problem.
An Analysis of Plate on the Elastic Half-Space by Using the Improved Subsection Method
Han, Choong-Mok ;
Journal of the Computational Structural Engineering Institute of Korea, volume 18, issue 2, 2005, Pages 133~140
A Plate on the elastic half-space may be generally be analyzed by the finite element method. However, there ate some difficulties to obtain the flexibility matrix of the foundation based on the Boussinesq's theory. In this study, an efficient numerical procedure which uses the analysis results of the vertical displacements due to the uniformly distributed loading in a circular area is presented. Some numerical examples represent better results than those of numerical integration technique or subsection method especially in the case of irregular mesh pattern.
Dynamics Analysis for Flexible Systems using Finite Elements and Algebraic Quaternions
Lee, Dong-Hyun ; Yun, Seong-Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 18, issue 2, 2005, Pages 141~149
This paper deals with formulations of the energy equilibrium equation by an introduction of the algebraic description, quarternion, which meets conservations of system energy for the equation of motion. Then the equation is discretized to analyze the dynamits analysis of flexible multibody systems in such a way that the work done by the constrained force completely is eliminated. Meanwhile, Rodrigues parameters we used to express the finite rotation lot the proposed method. This method lot the initial essential step to a guarantee of developments of the 3D dynamical problem provides unconditionally stable conditions for the nonlinear problems through the numerical examples.
Eigenvalue Analysis of Stiffened Plates on Pasternak Foundations
Lee, Byoung-Koo ; Kim, Il-Jung ; Oh, Soog-Kyoung ; Lee, Yong-Soo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 18, issue 2, 2005, Pages 151~158
This research analyzes eigenvalue analysis of stiffened plates on the Pasternak foundations using the finite clement method. For analyzing the stiffened plates, both the Mindlin plate theory and Timoshenko beam-column theory were applied. In application of the finite element method, 8-nodes serendipity clement system and 3-nodes finite element system were used for plate and beam elements, respectively. Elastic foundations were modeled as the Pasternak foundations in which the continuity effect of foundations is considered. In order to verify the theory of this study, solutions obtained by this analysis were compared with the classical solutions in reference, experimental solutions and solutions obtained by SAP 2000. The natural frequency of stiffened plates on Pasternak foundations were determined according to changes or foundation parameters and dimensions of stiffener.
An Improved Stability Design of Plane Frames using System Buckling and Second-order Elastic Analysis
Song, Ju-Young ; Kyung, Yong-Soo ; Kim, Nam-Il ; Kim, Moon-Young ;
Journal of the Computational Structural Engineering Institute of Korea, volume 18, issue 2, 2005, Pages 159~168
An improved stability design method for beam-columns of plane frames is proposed based on system buckling analysis and second-order elastic analysis. For this, the tangent stiffness matrix of beam-column elements is first derived using stability functions and a procedure for evaluating effective buckling lengths is reviewed using elastic system buckling analysis. And then the second-order analysis procedure is presented considering
effects and is compared with the closed-form solution through numerical examples. Design examples showing the validity of the proposed method we presented and their numerical results are compared with those obtained from the conventional stability design methods. Finally some useful conclusions are drawn.
Determination of Effective Buckling Length of Plane Frames using Elastic and Inelastic System Buckling Analysis
Song, Ju-Young ; Kyung, Yong-Soo ; Kim, Moon-Young ;
Journal of the Computational Structural Engineering Institute of Korea, volume 18, issue 2, 2005, Pages 169~179
An improved method for evaluating effective buckling lengths of beam-column members in plane frames is newly proposed based on system inelastic buckling analysis. To this end, the tangent stiffness matrix of be am-column elements is first calculated using stability functions and then the inelastic buckling analysis method is presented. The scheme for determining effective length of individual members is also addressed. Design examples and numerical results ?uc presented to show the validity of the proposed method.
Forces and Displacements of Highrise Braced Frames with Facade Riggers
Yuk, Min-Hye ; Jung, Dong-Jo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 18, issue 2, 2005, Pages 181~190
In the conventional outrigger system, the outriggers are located in the planes of the core walls and this system has disadvantage of obstructing flexibility in the interior layout. But thc facade riggers in the structure uc located In the exterior frames in the direction of the lateral loading. The interaction between the traced frames and facade riggers is through the floor diaphragms adjacent to the chords of the riggers. This paper presents an approximate analysis technique lot preliminary analysis of multiple facade rigger stiffened braced frames in tall buildings subjected to uniformly and triangularly distributed loads as well as a lateral point load at the top of the structure. Comparisons with the results by the program MIDAS for the structural models have shown that this analysis can give reasonably accurate results for highrise braced frames with multiple facade riggers. The method allows a simple procedure for obtaining the optimum level of the facade riggers in addition to a rapid assessment of the influence of the facade riggers on the performance of the highrise structure such as the reduction in lateral deflection at the top and the overturning moment at the base of the braced frame.
Comparative Study on the Flexural Characteristics of Composite Bridge Deck Fabricated with Filament Winding and Pultrusion
Lee, Sung-Woo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 18, issue 2, 2005, Pages 191~200
To develop composite bridge deck, comparative study on the flexural characteristics of deck fabricated with filament winding and pultrusion was performed. In this study, composite deck of triangular shape was fabricated with filament winding process and flexural tests were conducted along with pultruded 'Duraspan' deck. Failure load, maximum deflection and strains were compared with each other. Also finite element analysis for filament winding deck was carried out and the results were compared with those from experiments.
Prediction of Shear Strength Using Artificial Neural Networks for Reinforced Concrete Members without Shear Reinforcement
Jung, Sung-Moon ; Han, Sang-Eul ; Kim, Kang-Su ;
Journal of the Computational Structural Engineering Institute of Korea, volume 18, issue 2, 2005, Pages 201~211
Due to the complex mechanism and various parameters that affect shear behavior of reinforced concrete (RC) members, models on shear tend to be complex and difficult to utilize for design of structural members, and empirical relationships formulated with limited test data often work lot members having a specific range of influencing parameters on shear. As an alternative approach tot solving this problem, artificial neural networks have been suggested by some researchers. In this paper, artificial neural networks were used to predict shear strengths of RC beams without shear reinforcement. Especially, a large database that consists of shear test results of 398 RC members without shear reinforcement was used for artificial neural network analysis. Three well known approaches for shear strength of RC members, ACI 318-02 shear provision, Zsutiy's equation, and Okamura's relationship, are also evaluated with test results in the shear database and compared with neural network approach. While ACI 318-02 provided inaccurate predictions for RC members without shear reinforcement, the empirical equations by Zsutty and Okamura provided more improved prediction of Shear strength than ACI 318-02. The artificial neural networks, however provided the best prediction of shear strengths of RC beams without shear reinforcement that was closest to test results.
`변형률 보간 9절점 쉘 요소를 이용한 적층복합판과 쉘의 선형 정적 해석 및 자유진동 해석`에 대한 토론
Lee, Sang-Jin ;
Journal of the Computational Structural Engineering Institute of Korea, volume 18, issue 2, 2005, Pages 212~213