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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 23, Issue 6 - Dec 2010
Volume 23, Issue 5 - Oct 2010
Volume 23, Issue 4 - Aug 2010
Volume 23, Issue 3 - Jun 2010
Volume 23, Issue 2 - Apr 2010
Volume 23, Issue 1 - Feb 2010
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Determination of Effective Flange Width in Single Plane Cable-Stayed Concrete Bridge
Lee, Hwan-Woo ; Kim, Kwang-Soo ; Kang, Ho-Jun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 343~351
Bending and axial compressive stresses are distributed across the whole upper flange of a box girder bridge which has the span-to-depth ratio (B/L) of below 0.5, according to Korea Bridge Design Specifications (Minister of Land, Transport and Maritime Affairs, 2005). Shear lag phenomenon, however, can take place in the construction phase of cable-stayed bridge, in which stresses combining bending moment due to dead weight and cable vertical compression are induced. This study aims to analyze the effective width of flange over which composite stresses are given, which should be calculated during the construction phase of stiffening girder of single plane cable-stayed box girder bridge. The study results indicate that the full width of stiffening girder can be regarded as the effective flange width when the span-to-depth ratio for the deck is below 0.38. In other words, the area, where shear lag is taken into consideration, is larger than the width of box girder in single plane cable-stayed box girder bridges. Therefore, the current practice of considering the full width as the effective flange width regardless of changes of the span-to-depth ratio during the construction stage can produce an unsafe bridge. If the effective flange width is determined according to the single span structural system in the early stage of construction when the span-to depth ratio for the deck is high and composite stresses of every part expect each end of the bridge are calculated, it can result in a safe structural design. Since the span-to-depth ratio gradually decreases, however, it is appropriate to determine the effective width of flange on the basis of the full width and the cantilever structural system.
A Method of Measuring the Plastic Properties of Materials using Spherical Indentation
Li, Guanghe ; Kang, Yoon-Sik ; Xi, Chen ; Park, Tae-Hyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 353~360
In this paper, an efficient algorithm is established in order to estimate the plastic properties of power-law hardening bulk specimen materials with one simple spherical indentation impression test. This work is based on a new formulation of representative strain and, therefore, compare to the preceding approaches the fitting parameters are significantly reduced. Moreover, the new definition of representative strain endowed more physical meaning to the representative strain. In order to verify the reliability of the reverse analysis, we have studied a broad set of materials whose property ranges cover essentially all engineering metals and alloys. Based on the indentation force-displacement P-
curves obtained from numerical simulations, the characteristics of the indentation response and material elastoplastic properties are bridged via explicit functions. Next, through the procedure of reverse analysis the yield stress and power-law hardening exponent of bulk specimen materials can be determined. Finally, good agreement between the result from reverse analysis and initial input data from experiment can be observed.
The Mixed Finite Element Analysis for Nearly Incompressible and Impermeable Porous Media Using Parallel Algorithm
Tak, Moon-Ho ; Kang, Yoon-Sik ; Park, Tae-Hyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 361~368
In this paper, the parallel algorithm using MPI(Message-Passing Interface) library is introduced in order to improve numerical efficiency for the staggered method for nearly incompressible and impermeable porous media which was introduced by Park and Tak(2010). The porous media theory and the staggered method are also briefly introduced in this paper. Moreover, we account for MPI library for blocking, non-blocking, and collective communication, and propose combined the staggered method with the blocking and nonblocking MPI library. And then, we present how to allocate CPUs on the staggered method and the MPI library, which is related with the numerical efficiency in order to solve unknown variables on nearly incompressible and impermeable porous media. Finally, the results comparing serial solution with parallel solution are verified by 2 dimensional saturated porous model according to the number of FEM meshes.
The Mixed Finite Element Analysis for Porous Media using Domain Decomposition Method
Lee, Kyung-Jae ; Tak, Moon-Ho ; Kang, Yoon-Sik ; Park, Tae-Hyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 369~378
The mixed finite element analysis is the most widely used method for saturated porous media. Generally, in this method, direct method and iterative method are proposed to obtain unknown variable, however, the iterative method is recommended because the method provide numerical stability and accuracy under the material properties for solid and fluid are different. In this paper, we introduce staggered method which has strong numerical stability, and FETI(Finite Element Tearing and Interconnecting) which is one of decomposition methods are applied into the method in order to obtain numerical efficiency. In which, Lagrange Multipliers and conjugated gradient method to solve decomposed domain are proposed, and then, the proposed method is verified numerical efficiency by point to point MPI(Message Passing Interface) library.
Form Generation of Structural Bridges based on Geometric Approach
Kim, Nam-Hee ; Koh, Hyun-Moo ; Hong, Sung-Gul ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 379~386
In conceptual design stage it is important to develop structural forms freely. However, structural engineers are prompt to consider types of structural systems following load paths rather than to imagine various forms. This study attempts to expand the limit of imagination that was blocked within engineering approach newly from geometric perspective view. First of all, existing bridge structures are reviewed in terms of geometric vocabulary. Some bridge forms showing apparent geometric features are regenerated through the geometric approach proposed in this study. This study is not to develop geometric principle to build new structural forms, but to propose the geometric approach to generate design alternatives using the well established geometry concepts.
An Evaluation of Blast Resistance Performance of RC Columns According to the Shape of Cross Section
Kim, Han-Soo ; Park, Jae-Pyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 387~394
The alternative load path method based on a column removal scenario has been commonly used to protect building structures from being progressively collapsed due to probable blast loading. However, this method yields highly conservative result when the columns still have substantial load resisting capacity after blast. In this study, the behavior of RC columns with rectangular and circular sections under the blast loading was investigated and the remaining capacity of the partially damaged columns was compared. AUTODYN which is a hydrocode for the analysis of the structure on the impact and blast loading was used for this study. The blast loading was verified with the experiment results. The analysis results showed that the circular columns are preferable to the rectangular ones in respect of the blast resistance performance.
Average Correction for Compensation of Differential Column Shortening in High-rise Buildings
Park, Sung-Woo ; Choi, Se-Woon ; Park, Hyo-Seon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 395~401
The vertical members of structures are shortened as time goes on. Because structures have been high-rising and atypical there should be different axial loads among vertical members and it causes differential column shortenings. The differential column shortening add stresses to connections, make slab tilt, and damage to non-structural components. To reduce these influences compensation is need. The rational compensation means the exact expectation of amounts of column shortenings and the reasonable corrections. The expectation of column shortenings are more exact as researched, however, there is little research about the compensation. This paper presents the average correction method and the constraints for differential column shortenings considering errors due to the construction precision. The relations between constraints and the number of correction groups give an objective criterion for decision of constraints.
A Study of Adhesive Mechanism of Gecko Adhesion System using Adhesive Beam Contact Model
Kim, Won-Bae ; Cho, Maeng-Hyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 403~407
Gecko adhesion system consists of beam-shaped seta and spatula which has the role of adhesive pad. In this paper, adhesion mechanism of gecko adhesion system is performed by using adhesive beam contact model. this model has a feature of non-uniform stress profile on the contact surface and adhesion/detachment mechanism is determined by the tensile stress of the contact region. a spatula tip pad has the role of reduction of maximum tensile stress and adhesive force is increased due to this effect. As for a reverse loading case, maximum compressive stress drops by the spatula effect and this cause unsymmetric loading conditions between adhesion and detachment forces. In this study, finite element method is used for the analysis of adhesive beam contact model and the results for spatula effect are presented.
Analytical Study on Punching Shear of Reinforced Concrete Flat Plates
Kim, Min-Sook ; Lee, Young-Hak ; Kim, Hee-Cheul ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 409~415
A finite element model for punching shear of flat plate structures is presented. A parametric study also has been conducted to verification of influence of several parameters in terms of the flexural reinforcement ratio, slab thickness. Reisnner-Mindlin assumptions are adopted to consider of shear deformation. Layered shell element is considered for the material non-linearities. The finite element model of this study was verified comparing with existing experimental results. The model is able to predict the capacity of the flat plate structures. The punching shear of flat plate structures varied depending on the flexural reinforcement ratio, slab thickness.
A Parametric Modeling Method for Automatic Fitting of Longitudinal Geometry of Box Girder in FCM Bridge
Lee, Sang-Ho ; An, Hyun-Jung ; Kim, Bong-Geun ; Eom, In-Soo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 417~424
This study proposes a parametric modeling method for efficient preliminary design of FCM(Free Cantilever Method) bridge. The method is capable of automatic fitting of cross section according to variation of span length of box girder which has variational section. Parameters for forming longitudinal geometry of box girder are defined, then implicit and explicit constraints, and functional relations among them are defined by applying statistics of parameters used in FCM bridge designs. The constraints and relations are applied to a sample bridge for verifying applicability of parametric modeling. In addition, material quantity of the sample model generated by parametric modeling is estimated and compared to the quantity of the real designed model to check the accuracy of the automatically designed parametric model.
A Study on the Alternative Evaluation of the High-rise Building Structural System
Kim, Yeong-Min ; Kim, Chee-Kyeon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 425~434
This study presents the alternative evaluation technique for the high-rise building structural system. The alternative evaluation of the structural system is performed in three steps, that is, preliminary evaluation, main evaluation and detailed evaluation. The evaluation categories are composed of structural performance, economic feasibility and term of work. Each categories are composed of detailed items to evaluate of its own. In preliminary evaluation, qualitative evaluation based on experimental knowledge is performed. In main and detailed evaluations, quantitative evaluations based on numeric data are performed. The weighted-sum method is applied to integrate the evaluated results of each items and its importance. The applicability of the proposed method was verified by applying it to the practical buildings and simulate the procedures.
Response Reduction of a SDOF Structure based on Friction Force Ratio of MR Controller
Seong, Ji-Young ; Min, Kyung-Won ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 435~443
This study presents key parameters for the structure installed with MR controller in reducing its responses. MR controller is regarded as Bingham model of which control forces are frictional and viscous ones. The parameters are identified as friction force ratios,
which are, respectively, ratio of MR controller friction force to static restoring force for free vibration and ratio of the friction force to amplitude of harmonic force. Structure-MR controller system shows nonlinear response behavior due to friction force. Energy balance strategy is adopted to transform the behavior to linear one with equivalent damping ratio. Finally, proposed equivalent linear process is compared to the nonlinear one, which turns out to give acceptably good results.
Assessment of the Internal Pressure Fragility of the CANDU Type Containment Buildings using Nonlinear Finite Element Analysis
Hahm, Dae-Gi ; Choi, In-Kil ; Lee, Hong-Pyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 23, issue 4, 2010, Pages 445~452
In this paper an assessment of the internal pressure fragility of the CANDU type containment buildings is performed. The uncertainties of the performance of the containment buildings, material properties and tendon characteristics are referred from the in-service reports of Wolsung Unit 1. The containment buildings are modeled as a three-dimensional finite elements with considering the major opening and penetrations. A new method to evaluate the probabilistic fragility of the massive structural system is developed. The fragility curves of the target containment building are presented with repect to the failure modes and reliability levels. The center of wall is reveled as the most weak structural component of the containment building in the sense of the rupture and catastrophic rupture failure modes.