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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
Journal Basic Information
Journal DOI :
The Computational Structural Engineering Institute
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Volume & Issues
Volume 22, Issue 6 - Dec 2009
Volume 22, Issue 5 - Oct 2009
Volume 22, Issue 4 - Aug 2009
Volume 22, Issue 3 - Jun 2009
Volume 22, Issue 2 - Apr 2009
Volume 22, Issue 1 - Feb 2009
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Nonlinear Finite Element Analysis of UHPFRC I-Beam on the Basis of an Elastic-Plastic Fracture Model
Han, Sang-Mook ; Guo, Yi-Hong ;
Journal of the Computational Structural Engineering Institute of Korea, volume 22, issue 3, 2009, Pages 199~209
This paper deals with the three-dimensional finite element analysis of failure behavior of UHPFRC I-beam under monotonic load. Different from the constitutive law of normal and high strength concrete, an elastic-plastic fracture model that considers the tensile strain hardening is proposed to describe the material properties of UHPFRC. A multi-directional fixed crack criterion with tensile strain hardening is defined in the tensile region, and Drucker-Prager criterion with an associated flow rule is adopted in the compressive region. The influence of span, prestressing force and section on the behavior of UHPFRC I-beam are investigated. The comparison of the numerical results with the test results indicates a good agreement.
An Application of Construction Sequence Analysis for Checking Structural Stability of High-Rise Building under Construction
Eom, Tae-Sung ; Kim, Jae-Yo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 22, issue 3, 2009, Pages 211~221
With recent trends of super-tallness, atypical plan shapes and zoning constructions in high-rise buildings, a structural stability of the building under construction is arising as a key issue for design and construction plan. To ensure the structural stability under construction, the differential column shortening of vertical members, the lateral displacement of tower frames, and differential settlement of raft foundation by unbalanced distributions of a tower self-weight before the completion of a lateral load resisting system should be checked by construction sequence analysis, which should be performed by systematic combinations with structural health monitoring, construction compensation program, and construction panning. This paper presents the scheme of zone-based construction sequence analysis by using the existing commercial analysis program, to check the stability of high-rise building under construction. This scheme is applied to 3-dimensional structural analysis for a real high-rise building under construction. The analysis includes real construction zoning plans and schedules as well as creep and shrinkage effects and time-dependent properties of concrete. The simplified construction sequence and assumed material properties were continuously updated with the change on construction schedule and correlations with in-situ measurement data.
An Inverse Boundary Element Method for Finding Boundary Tractions of an Elastic Body
Lee, Sang-Hoon ; Kim, Hyun-Gyu ;
Journal of the Computational Structural Engineering Institute of Korea, volume 22, issue 3, 2009, Pages 223~229
Most of structural analyses are concerned with the deformation and stress in a body subjected to external loads. In many fields, however, the interpretation of inverse problems is needed to determine surface tractions or internal stresses from measured displacements. In this study, the inverse processes by using the boundary element method are formulated for the evaluation of boundary tractions from displacements measured on a remote surface. Small errors in measured displacements often result in a substantial loss of accuracy of an inverse system. Numerical results show that the error in reconstructed tractions by using the inverse boundary element methods is sensitive to measurement location and noise.
Efficient Dynamic Analysis of High-rise Buildings Having Belt Walls Connected by a Sky-Bridge
Lee, Dong-Guen ; Kim, Hyun-Su ; Yang, Ah-Ram ; Ko, Hyun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 22, issue 3, 2009, Pages 231~242
In the design of a sky-bridge, repetitive boundary nonlinear time history analyses are required to accurately predict dynamic behaviors of the connected buildings because the connection systems of a sky-bridge usually have high nonlinearity. If a conventional finite element model for entire high-rise buildings is used for repetitive boundary nonlinear time history analyses, computational efforts could be significant. In this study, an equivalent cantilever model considering the belt-wall effect has been proposed for an efficient dynamic analysis and a performance evaluation of vibration control of high-rise buildings connected by a sky-bridge. To verify the accuracy and efficiency of the proposed equivalent model, boundary nonlinear time history analyses of 49- and 42-story example buildings connected by a sky-bridge have been performed for wind excitation. Based on the analytical results, it has been verified that the proposed equivalent model can provide accurate dynamic responses of building structures connected by a sky-bridge with significantly reduced computational efforts.
Construction of 3D CAD Template for the Efficient Design of Refrigerator Components
Lim, O-Kaung ; Park, Sam-Kyu ; Choi, Eun-Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 22, issue 3, 2009, Pages 243~250
In order to reduce the time needed for design, enterprises recently need the customizing technology that can modify the functions of existing CAD systems according to the their purposes. So most of the companies developing commercial CAD system are providing API to make possible the preparation of macro or external programs, which allow automatic performance of a series of repeated tasks. The objective of the present paper is to achieve more convenient carrying out of a particular modeling, by developing 3D CAD template of the standardized engineering rule of the particular model in order to establish a knowledge-based product development system. The formula, data and design knowledge which are required for the designing of the components of refrigerator were made into a program by means of Unigraphics' UG/Open API. And examples of such a development were presented. By using them in connection with commercial CAD system, design verification and modification were efficiently applied to the product design business.
Fire Power Analysis for Concept Exploration of Combat Vehicle
Lim, O-Kaung ; Choi, Eun-Ho ; Ryoo, Jae-Bong ;
Journal of the Computational Structural Engineering Institute of Korea, volume 22, issue 3, 2009, Pages 251~258
At the stage conceptual design, combat vehicle is classified into three general categories of fire power, mobility and physical properties of system. The present research is restricted to fire power and its optimization. At the stage of conceptual designing of system, it is appropriate to consider major variables affecting fire power - including the weight of bullet, which exerts a direct influence on destroying effect, maximum range which takes long range firing in consideration. To estimate the maximum firing range, a simple interior ballistic and an exterior ballistic model were built by using the lumped parameter method, Le Duc method and point mass trajectory model. Design of experiment and regression analysis was used to derive simulations of fire power. Finally, response surface models were built and design variables were analyzed.
Element Connectivity Based Topology Optimization for Linear Dynamic Compliance
Yoon, Gil-Ho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 22, issue 3, 2009, Pages 259~265
This paper studies the Element Connectivity Parameterization Method(ECP method) for topology optimization considering dynamic compliance. The previous element density based topology optimization method interpolates Young's modulus with respect to design variables defined in each element for topology optimization. Despite its various applications, these element density based methods suffer from numerical instabilities for nonlinear structure and multiphysics systems. To resolve these instabilities, recently a new numerical method called the Element Connectivity Parameterization(ECP) Method was proposed. Unlike the existing design methods, the ECP method optimizes the connectivities among plane or solid elements and it shows some advantages in topology optimization for both nonlinear structure and multiphysics systems. In this study, the method was expanded for topology optimization for the dynamic compliance by developing a way to model the mass matrix in the framework of the ECP method.
Partial Layerwise-to-ESL Coupling Elements for Multiple Model Analysis
Shin, Young-Sik ; Woo, Kwang-Sung ; Ahn, Jae-Seok ;
Journal of the Computational Structural Engineering Institute of Korea, volume 22, issue 3, 2009, Pages 267~275
This paper presents the p-convergent coupling element on the basis of the ESSE(equivalent single layer shell element) and the PLLE(partial-linear layerwise element) to analyze laminated composite plates. The ESSE is formulated by the degenerated shell theory, on the other hand, the assumption of the PLLE is piecewise linear variation of the in-plane displacement and a constant value of lateral displacement across the thickness. The proposed finite element model is based on p-convergence approach. The integrals of Legendre polynomials and Gauss-Lobatto technique are chosen to interpolate displacement fields and to implement numerical quadrature, respectively. This study has been focused on the verification of p-convergent element. For this purpose, various finite element multiple models associated with the combination of ESSE and PLLE elements are tested to show numerical stability. The simple examples such as a cantilever beam subjected vertical load and a plate with tension are adopted to evaluate the performance of proposed element.
Structural Optimization of High-rise Buildings using High-strength Steels
Seo, Ji-Hyun ; Kwon, Bong-Keun ; Kim, Sang-Bum ; Park, Hyo-Seon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 22, issue 3, 2009, Pages 277~287
Recently, the high-strength steel of 400~600MPa tensile strength is producing in the country. Use of high-strength steel member in the design of high-rise buildings is expected to increase the efficiency of structural design in the aspect of structure material weight and cost, however it has been used only a narrow extent. No efficient design method to use high-strength steel in the design of high-rise buildings has been developed. Therefore, in this study structural cost optimization technique that can minimize the structural material cost of high-rise buildings using high-strength steels is developed. The efficiency of the technique is evaluated by comparing the experience-based design for 6 high-rise building examples. As a result, the proposed techniques can save 7~21% of structural material cost compared with experienced-based design. And also, the rough guideline for effective use of high-strength steels in the structural design of high-rise buildings is introduced on the basis of results.
Modal Properties of a Tall Reinforced Concrete Building Based on the Field Measurement and Analytical Models
Kim, Ji-Young ; Kim, Ju-Yeon ; Kim, Mi-Jin ; Yu, Eun-Jong ; Kim, Dae-Young ;
Journal of the Computational Structural Engineering Institute of Korea, volume 22, issue 3, 2009, Pages 289~296
Natural frequency is a key parameter to determine the seismic and wind loading of tall flexible structures, and to assess the wind-induced vibration for serviceability check. In this study, natural frequencies and associated mode shapes were obtained from measured acceleration data and system identification technique. Subsequently, finite element(FE) models for a tall reinforced concrete buildings were built using a popular PC-based finite element analysis program and calibrated to match their natural frequencies and mode shapes to actual values. The calibration of the FE model included: 1) compensation of modulus of elasticity considering the mix design strength, 2) flexural stiffness of floor slabs, and 3) major non-structural components such as plain concrete walls. Natural frequencies and mode shapes from the final FE model showed best agreement with the measured values.