• Journal of the Computational Structural Engineering Institute of Korea
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• v.16 no.1
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• pp.9-18
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• 2003

In static analysis of a variety of structures, the matrix method of structural analysis is the most widely used and powerful analysis method. However, this method has drawback requiring high-performance computers with many memory units and fast processing units in the case of analyzing accurately structures with a large number of degrees-of- freedom. Therefore, it's very difficult to analyze these structures accurately in personal computers. For overcoming the drawback of the matrix method of structural analysis, authors suggest the transfer stiffness coefficient method(TSCM). The TSCM is very suitable to a personal computer because the concept of the TSCM is based on the transfer of the stiffness coefficient for an analytical structure. In this paper, the static analysis algorithm for frame structures is formulated by the TSCM. We confirm the validity of the TSCM through the comparison of computation results by the TSCM, the NASTRAN, the matrix method of structural analysis and the analytical solution.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.12 no.3
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• pp.385-396
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• 1999

In the process of structural design for large-scale structures with several thousands of degrees of freedom, a plethora of structural calculations with large amount of data storage are required to obtain the forces and displacements of the members. However, current computational environment with single microprocessor such as a personal computer or a workstation is not capable of generating a high-level of efficiency in structural analysis and design process for large-scale structures. In this paper, a high-performance parallel computing system interconnected by a network of personal computers is proposed for an efficient structural analysis. Two distributed structural analysis algorithms are developed in the form of distributed or parallel preconditioned conjugate gradient (DPCG) method. To enhance the performance of the developed distributed structural analysis algorithms, the number of communications and the size of data to be communicated are minimized. These algorithms are applied to the structural analyses of three large space structures as well as a 144-story tube-in-tube framed structure.

• Journal of the Korea institute for structural maintenance and inspection
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• v.18 no.2
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• pp.30-37
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• 2014

In this study, we studied how to perform the structural analysis which need a large-capacity flash memory with the computer program when the flash memory storage of a personal computer has no enough room for the analysis of structure. As one of the solutions of this problem, the blocking method of stiffness matrix, which is a method that stiffness matrix is divided by a few blocks and each block is sequentially used for the calculation of matrix decomposition, is proposed and an algorithm available in computer program is derived on the method. Finally, A structural analysis program (sNs) based on this study is developed and the correctness and efficiency of the algorithm is founded through some examples which are fundamental in structural analysis.

• Computational Structural Engineering
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• v.7 no.4
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• pp.10-16
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• 1994

근본적으로 터널을 정확히 해석하려면 3차원 해석이 필요하다. 그러나 3차원 해석은 다루어야 할 자료가 방대하고 또한 시공 단계를 고려하는 3차원 소성해석을 정확히 하기 위해서는 슈퍼컴퓨터와 같은 컴퓨터 파워가 요구된다. 따라서 터널의 해석에서는 대개 하중분배율법을 사용하여 2차원 해석을 수행하고 있는 실정이다. 그러나 하중분배율법에 의한 2차원 해석의 결과는 선택한 하중분배율법에 의존함으로 정확한 하중분배율을 아는 것이 중요하다. 2차원 터널해석을 정확히 하기 위해서는 본문에 기술한 요건을 갖춘 프로그램의 확보, 하중분배율에 대한 정확한 평가, 측압 계수의 신중한 선택, 주위 지반의 물성에 대한 신중한 평가가 필요하다.

• Computational Structural Engineering
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• v.4 no.3
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• pp.40-43
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• 1991

한국과학기술연구원(KIST)부설 시스템공학연구소(SERI)가 보유하여 일반 사용자들에게 공개하고 있는 구조해석 S/W/로는 ABAQUS, ADINA, BOPACE-3D, DYNA-3D, MSC/NASTRAN, DIS/ADLPIPE, SAP5, KISTRAS, NONSAP, MARC 등을 들 수 있다. 이들 중 DIS/ADLPIPE, SAP5, KISTRAS, NONSAP은 CDC CYBER 960-31에 설치되어 있고 MARC는 NAS AS/XLV50에 설치되어 있으며 나머지는 CRAY-25 슈퍼컴퓨터에 설치되어 있다. 본 고에서는 이들 중에서 CRAY-2S 슈퍼컴퓨터에 설치되어 있으며 다양한 비선형 구조해석기능을 가지고 있는 ABAQUS, ADINA, MSC/NASTRAN 및 DYNA-3D에 대하여 개요, 기능 및 사용방법을 간략히 소개하고저 한다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.14 no.2
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• pp.127-134
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• 2001

구조물이 점점 더 커짐에 따라 그들을 분석하고 설계하는 것이 더 복잡해지고 더 많은 시간이 요구된다. 현재 사용되는 단일 프로세서를 가진 컴퓨터는 그와 같은 구조물을 해석하기에 효율적이지 못하다고 여겨진다. 이 논문에서는 거대규모의 구조물을 분석하기 위하여 컴포넌트 모우드법(CMM)과 메시지전달 시스템(MPI)을 이용함으로써 표준 병렬기법과 고도로 효율적이고 이식성 있는 프로그램을 새로 개발하였다. 이 연구에서는 구조물의 동적 해석을 위해 병렬처리기법을 지닌 컴퓨터 프로그램이 제시되고 새로 개발된 프로그램이 신뢰도를 갖고 있다는 것이 입증된다. 또한 이 프로그램은 상업용 프로그램보다 훨씬 처리속도가 빠르고 병렬처리 컴퓨터에서도 사용될 수 있다는 것을 보여준다.

• Computational Structural Engineering
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• v.10 no.1
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• pp.7-18
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• 1997

본 고에서는 컴퓨터를 이용하여 비선형문제를 어떻게 다룰 것인가에 관해 기초 지식에서부터 응용까지를 간단히 설명한다. 먼저 기하학적 비선형 문제를 중심으로, 기존의 비선형 해석기법에 관해 기초적인 기법부터 고난도의 기법까지 일반적으로 많이 사용되는 것을 자세히 소개한다. 또 대공간 구조물의 비선형 해석기법에 관한 이해를 돕기 위해 비교적 간단한 부재인 케이블/트러스 요소를 이용한 몇몇 예제와 비선형해석으로 인한 구조물 거동의 특성도 다룬다.

• Journal of Advanced Navigation Technology
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• v.23 no.5
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• pp.460-465
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• 2019

In this study, we aim to derive a solution from the structural analysis for electrical failure of single board computers for computing navigation information. By analyzing the characteristic factor, we identify that crack occur on the central processing unit board due to a certain structural problem, and that the physical effect by the crack make communication function be impossible to perform, which it causes booting error. In order to find the location of excessive stress causing the crack, structural analysis for the single board computer is done. From the structural analysis, the areas where stress concentration occurs are identified, and improvement methods changing the structures are developed. As a result, we shows that stresses are reduced entirely on the stress distribution for the improved structure. In addition, heat analysis shows that changing the structure to reduce stresses is not affect to the heat radiation, and the thermal resistance of the actual equipment is verified by measuring the temperature of the heat sink applied with the improved structure.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.14 no.1
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• pp.21-28
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• 1994

This paper discusses the block method on cable stayed bridge. The block method is one of the structural analysis methods, and it calculates the sectional forces and the displacements by combining results of several sub-structural system after analyzing each divided structure by means of finite element method. The block method has two branches, one is based on the force method and the other is based on the displacement method. We can select one of two methods by considering structural stability of divided structures. The conclusion gives some thoughts about cable stayed bridge analysis using this block method. Those are as follows. First, the results of analysis on divided structural system are consistent with those of analysis on global structural system. Second. saving memory volume of computer, we can analyze the complicated multi-cable stayed bridge on personal computer.

• Computational Structural Engineering
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• v.6 no.3
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• pp.45-48
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• 1993

일반적으로 구조설계 실무자들은 컴퓨터 프로그램을 통한 구조물 해석시, 구조물의 안정성 여부로 인하여 한두번쯤은 고민을 하였을 것이라 생각된다. 본문은 해석프로그램이 언제 "구조물이 불안정하다"는 메시지를 출력하게 되는지, 왜 이런 문제가 발생하게 되는지와 함께 어떻게 이러한 문제에 대처해야 하는지에 대하여 설명하는 것을 목적으로 하고 있다.