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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 24, Issue 6 - Dec 2011
Volume 24, Issue 5 - Oct 2011
Volume 24, Issue 4 - Aug 2011
Volume 24, Issue 3 - Jun 2011
Volume 24, Issue 2 - Apr 2011
Volume 24, Issue 1 - Feb 2011
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The Wavelet Series Analysis for the Fourth-order Elliptic Differential Equation
Jo, Jun-Hyung ; Woo, Kwang-Sung ; Sin, Young-Sik ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 355~364
In this study, the details of WSA(wavelet series analysis) have been demonstrated to solve the 4th-order elliptic differential equation. It is clear to solve the 2nd-order elliptic differential equation with the basis function of Hat wavelet series that is used in the previous study existed in
-space. However, it is difficult to solve the 4th order differential equation with same basis function of Hat wavelet series because of insufficient differentiability and integrability. To overcome this problem, the linear equations in terms of moment and deflection have been formulated and solved sequentially that are similar to extension of Elastic Load Method and Moment Area Method in some senses. Also, the differences and common points between the proposed method and the meshless method are discussed in the procedure of WSA formulation. As we expect, it is easy to ascertain that the more terms of Hat wavelet series are used, the better numerical solutions are improved. Also the solutions obtained by WSA have been compared with the conventional FEM solutions in case of Euler beam problems with stress singularity.
Analysis of Reinforced Concrete Panel subjected to Blast Load using Parallel and Domain Decomposition
Park, Jae-Won ; Yun, Sung-Hwan ; Park, Tae-Hyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 365~373
Damage of reinforced concrete panel subjected to blast load using parallel and domain decomposition is analyzed. The numerical results are sensitive to the mesh size because blast waves are generated during the extremely short term. In order to investigate the effect of mesh size on the blast wave, the analysis results from various wave mesh size using AUTODYN, the explicit finite element analysis program, were compared with existing experimental results. The smaller mesh size was, the higher accuracy was. However, in this case, the analysis was inefficient. Therefore, in order to increase numerical efficiency, the parallel analysis using decomposed method based on Euler and Lagrangian description was performed. Finally, the decomposed method using both the structure domain based on Lagrange description and the blast wave domain based on Euler description was more efficient than the decomposed method using only the Lagrange mesh on structure domain.
Preliminary Form Design of Cable Structure using Computer Graphics
Kim, Nam-Hee ; Koh, Hyun-Moo ; Hong, Sung-Gul ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 375~382
Nowadays computer graphic softwares have opened a lot of potential by providing parametric modeling and generative algorithms which are useful not only to describe various geometrical shapes but also to implement a designer's intent in terms of modules systematically. This study has proposed a way of developing a module for generating preliminary structural configuration using such potential computer graphics. Especially parametric modeling and generative algorithm are utilized to define various design alternatives, and moreover use of dynamic graphics enables designers to generate a structural form on one side and a force flow diagram correspondingly provided on the other. This ultimately leads to rational preliminary design of a structural form considering its force flow.
Analysis on the Dynamic Characteristics of a Rubber Mount Considering Temperature and Material Uncertainties
Lee, Doo-Ho ; Hwang, In-Sung ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 383~389
In this paper, a statistical calibration method is proposed in order to identify the variability of complex modulus for a rubber material due to operational temperature and experimental/model errors. To describe temperature- and frequency-dependent material properties, a fractional derivative model and a shift factor relationship are used. A likelihood function is defined as a product of the probability density functions where experimental values lie on the model. The variation of the fractional derivative model parameters is obtained by maximizing the likelihood function. Using the proposed method, the variability of a synthetic rubber material is estimated and applied to a rubber mount problem. The dynamic characteristics of the rubber mount are calculated using a finite element model of which material properties are sampled from Monte Carlo simulation. The calculated dynamic stiffnesses show very large variation.
Sensitivity Analysis of Parameters Affecting Seismic Response for RC Shear Wall with Age-Related Degradation
Park, Jun-Hee ; Choun, Young-Sun ; Choi, In-Kil ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 391~398
After a concrete is poured, reinforced concrete structures were distressed by physical and chemical factor over time. It is in need to define important variables related to structural behavior for effectively conducting seismic analysis of structures with age-related degradation. In this study, a sensibility analysis using the first-order second moment method was performed to analyze an important variables for the reinforced concrete shear wall with age-related degradation. Because the seismic capacity of aging structures without a concrete hardening effect can be underestimated, the sensibility of analysis variables was analyzed according to the concrete hardening. Important variables for RC shear wall with age-related degradation was presented by using the tornado diagram.
A Study for Smart Overload Vehicle Regulation System
Jo, Byung-Wan ; Yoon, Kwang-Won ; Park, Jung-Hoon ; Choi, Ji-Sun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 399~404
Overload vehicles have demoralizing influence upon the social overhead capital, economics of nation, traffic flow and road safe as various components. Accordingly, this study established a ubiquitous sensor network system to develop an intelligent regulation system to monitor overloaded vehicles in motion. and Unlike WIM, after detecting the axle of driving vehicles by measuring deformation of roads, this system calculates the weights of vehicles by using signals from the strain sensors installed under the road and an analysis method. Also the study conducted an simulation test for vehicle load analysis using genetic algorithm. and tested wireless sensor for USN system.
Application of the Preconditioned Conjugate Gradient Method to the Generalized Finite Element Method with Global-Local Enrichment Functions
Choi, Won-Jeong ; Kim, Min-Sook ; Kim, Dae-Jin ; Lee, Young-Hak ; Kim, Hee-Cheul ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 405~412
This paper introduces the generalized finite element method with global-local enrichment functions using the preconditioned conjugate gradient method. The proposed methodology is able to generate enrichment functions for problems where limited a-priori knowledge on the solution is available and to utilize a preconditioner and initial guess of good quality with only small addition of computational cost. Thus, it is very effective to analyze problems where a complex behavior is locally exhibited. Several numerical experiments are performed to confirm its effectiveness and show that it is computationally more efficient than the analysis utilizing direct solvers such as Gauss elimination method.
The Prediction of Elastic Behavior of the Nano-Sized Honeycombs Based on the Continuum Theory
Lee, Yong-Hee ; Jeong, Joon-Ho ; Cho, Maeng-Hyo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 413~419
The nano-size hoenycomb structures have the higher ratio of the surface to the volume than macro-size honeycomb structures, and they can maximize the functionality of the electrical and chemical catalyst. The mechanical behaviors of the nano-sized structures are different from ones of the macro-size structure, and it is caused by the surface effect. This surface effect can be investigated by the atomistic simulation; however, the prediction of mechanical behaviors of the nano-sized honeycombs are practically impossible due to excessive computational resources and computation time. In this paper, by combining the bridging method considering the surface stress elasticity model with homogenization method, the mechanical behaviors of the nano-sized honeycombs are predicted efficiently.
Seismic Analysis Process of Steel Box girder Bridge based on BIM
Lee, Heon-Min ; Lee, Jin-Kyoung ; Yoo, Jae-Myoung ; Shin, Hyun-Mock ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 421~428
The communication of each others is lack between planing, design, construction and maintenance in domestic construction industry. This problem makes the omission of information and the loss of cost. So, the introduction of BIM can be the solution about that. BIM manages all information generated during all life-cycle of a structure and consequently maximizes the efficiency of utilizing information. This is done through 3D information model associated with a three-dimensional(3D) parametric CAD. This study proposes the seismic analysis process of steel box bridge for structural design of bridge construction project based on BIM. The additional process is needed for the purpose that structural data is inherent in the property information of 3D information model. This process has 3D modeling progress done by using the information decided in design phase. The design document of seismic analysis can be derived with the proposed process to steel box bridge.
Thermal analysis of two main CCS(cargo containment system) insultaion box by using experimental thermal properties
Choi, Sung-Woong ; Roh, Jeong-U ; Kim, Moo-Sun ; Lee, Woo-Il ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 429~438
In this paper, experiment of thermal conductivity among thermal properties for CCS insulation material was carried out under the condition ranged from room temperature to cryogenic temperature. CCS insulation system should be sustained under cryogenic temperature(
), and lots of investigations will be conducted how to block the heat to insulation material. CCS components which consist of various materials are especially the main interests, and how the temperature of the entire CCS along the location is should be investigated through these studies. With the experimental thermal properties, the steady state thermal analysis of the entire cargo system was conducted. When the LNG leaked through the insulation system with external impact, temperature distribution and thermal safety of secondary barrier, especially plywood and hull structure, was observed.
A Numerical Study for Deformation Characteristics of the Wearing Surface on a Steel Plate Deck under Wheel Loads
Kim, Hae-Na-Rae ; Ock, Chang-Kwon ; Kim, Moon-Young ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 439~447
Longitudinal cracks due to traffic truck loadings that are caused by local deformations of steel orthotropic bridge decks are sometimes observed in the wearing surface. So, underlying causes of the longitudinal pavement crack induced by structural behaviors of steel decks are investigated in this study. For this purpose, The rational finite element model of the steel deck and the pavement having the box girder is developed and a parametric study is performed by varying thickness or elastic modulus ratios of both the steel deck plate and the pavement. As a result, a large tensile strain above the webs of the u-rib and the box girder, which becomes the main cause of the cracks of the pavement, is detected from variation of the normal strain component of the wearing surface in the transverse direction.
A Study on the Performance Assessment of PHWR Containment Building
Lee, Hong-Pyo ; Jang, Jung-Bum ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 449~455
Recently, international collaborative research which was organized at Bhabha Atomic Research Centre in India, was conducted to develop for pressure capacity and nonlinear behavior of PHWR 1/4 scale nuclear containment building between experimental test and numerical code. In this paper, a nonlinear finite element analysis was carried out in order to predict ultimate pressure capacity and nonlinear behavior of the 1/4 scale containment building. The 1/4 scale containment building is consisted of basemat, cylinder wall, dome and 4-buttress. For the finite element analysis, commercial program ABAQUS was used. Finite element models including concrete, rebar and tendon have been developed for assessment of ultimate pressure capacity and failure mode for nuclear containment building. From the analysis results, first crack of the concrete, the yielding of the rebar and ultimate capacity pressure occurred at
Design of Friction Dampers installed at a Multi-Story Building under Seismic Load
Seong, Ji-Young ; Min, Kyung-Won ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 457~462
In this study, a simplified design procedure for friction dampers of a multi-story structure in order to reduce seismic response is proposed. To get insight for control effect of the structure with friction dampers is difficult, because of a nonlinear characteristic by a friction damper. Since a control force of a friction damper is influenced by coupling velocity between floors, adjoining modes are coupled. Thus structural response are derived by assuming steady-state response in resonance. As it is impossible that an exact solution is obtained for seismic load, first, a closed form solution can be achieved under harmonic vibration. Second, to convert a three-story building into a single-degree-of-freedom(SDOF) structure, modal analysis is performed. Third, an equivalent damping ratio is derived with utilizing closed form solution. And response reducing factor is proposed by it. Finally, friction force of a damper is designed for using response reducing factor, and then designed dampers are verified for seven seismic data. The nonlinear analysis results confirm the validity of the proposed procedure.
A Study on the Construction Management Method based on BIM for Civil Engineering Project
Kim, Sung-Hoon ; Lee, Sang-Ho ; Nam, Sang-Hyeok ; Sun, Oh-Young ;
Journal of the Computational Structural Engineering Institute of Korea, volume 24, issue 4, 2011, Pages 463~469
BIM(Building Information Modeling) technologies should be applied for the construction life cycle to maximize its efficiency, but the utilization for the construction phase has been significantly lower than that for the planning and design phase. Recently, some of BIM techniques such as 3D design review, 4D schedule management and so on are being introduced for efficient managing to the big national construction projects. In this study, the utilization plans of BIM are presented for the construction phase of civil engineering facilities. The methods of utilization of BIM are discussed for each type of construction, and the techniques applied to the Seoul Subway Lot No. 919 are analyzed for checking the applicability and usability. In particular, a web construction management system based on BIM can help field engineers, headquarters and contractors to use BIM more effectively, and it can be extended to maintenance phase for more efficiencies.