• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.623-630
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• 2006

In this paper, a geometric nonlinear analysis procedure of beam-column element including multi-noded cable element is presented. For this, first a stiffness matrix about beam-column element which considers the second effect of initial force supposing the curved shape at each time step with Hermitian polynomials as the shape function is derived and second, tangent stiffness matrix about multi-noded cable element being too. To verify geometric nonlinearity of this newly developed multi-noded cable-truss element, IPS(Innovative Prestressed Support) system using this theory is analysed by geometric nonlinear method and the results are compared with those by linear analysis.

• 대한조선학회논문집
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• 제53권5호
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• pp.388-399
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• 2016

A motion analysis of an underwater towed cable is a complex task due to its nonlinear nature of the problem. The major source of the nonlinearity of the underwater cable analysis is that the motion of the cable involves large rigid-body motion. This large rigid-body motion makes difficult to use standard displacement-based finite element method. In this paper, the authors apply recently developed nodal position-based finite element method which can deal with the geometric nonlinearity due to the large rigid-body motion. In order to enhance the stability of the large-scale nonlinear cable motion simulation, an efficient time-integration scheme is proposed, namely predictor/multi-corrector Newmark scheme. Three different predictors are introduced, and the best predictor in terms of stability and robustness for impulsive cable motion analysis is proposed. As a result, the nonlinear motion of underwater cable is predicted in a very efficient manner compared to the classical finite element of finite difference methods. The efficacy of the method is demonstrated with several test cases, involving static and dynamic motion of a single cable element, and also under water towed cable composed of multiple cable elements.

• Structural Engineering and Mechanics
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• 제43권5호
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• pp.583-605
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• 2012

This paper presents a spatial catenary cable element for the nonlinear analysis of cable-supported structures. An incremental-iterative solution based on the Newton-Raphson method is adopted for solving the equilibrium equation. As a result, the element stiffness matrix and nodal forces are determined, wherein the effect of self-weight and pretension are taken into account. In the case of the initial cable tension is given, an algorithm for form-finding of cable-supported structures is proposed to determine precisely the unstressed length of the cables. Several classical numerical examples are solved and compared with the other available numerical methods or experiment tests showing the accuracy and efficiency of the present elements.

• 한국강구조학회 논문집
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• 제17권4호통권77호
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• pp.449-457
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• 2005

다양한 케이블지지 시스템에 적용이 가능한 슬라이딩을 허용하는 다절점 케이블-트러스 요소를 개발한다. 먼저 일반적인 2절점 케이블-트러스 요소에 대한 유한요소 정식화 과정을 요약하고, 이를 토대로 여러 절점에 연결되어 장력은 동일하지만 절점에서 슬라이딩이 가능한 다절점 케이블-트러스 요소의 탄성강도행렬을 유도한다. 개발된 케이블-트러스 요소를 검증하기 위하여, 케이블 장력을 부정정력으로 선택하고 적합조건을 이용하여 장력을 산정하는 방법(유연도법)을 제시하고 두 방법에 의한 장력 값을 비교한다. 또한 상용 유한요소 해석프로그램의 2절점 트러스요소를 사용한 해석결과와도 비교, 분석한다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2005년도 춘계 학술발표회 논문집
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• pp.481-488
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• 2005

This study presents a elastic parabolic cable element for initial shaping analysis of cable structures. First, the compatibility condition and the tangent stiffness matrices of the elastic catenary cable element are shortly summarized. Next the force-deformation relations and the tangent stiffness matrices of the elastic parabolic cable elements are derived from the assumption that sag configuration under self-weights is small. To confirm the accuracy of this element, initial shaping analysis of cable-stayed bridges under dead loads is executed. Finally, the accuracy and the validity of the analysis-results are compared and analyzed through numerical examples.

• Structural Engineering and Mechanics
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• 제43권1호
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• pp.53-70
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• 2012

Sliding cable joints have been developed for the cable dome structures and the suspen-dome structures to reduce the cable pre-stressing loss and obtain a uniform inner force in each hoop cable. However, the relevant investigation is less addressed on the structural behavior of the cable dome structures and the suspen-dome structures with sliding cable joints due to the lack of analysis techniques. In this paper, a closed sliding polygonal cable element was established to analyze the structural behavior of the cable dome structures and the suspen-dome structures with sliding cable joints. The structural behaviors with sliding cable joints were obtained.

• 국제강구조저널
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• 제18권5호
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• pp.1699-1709
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• 2018

Suspen-dome structures are extensively used due to their superiority over traditional structures. The friction between cable and joints may severely influence the distribution of cable force, especially during the pre-stressing construction period. An accurate and efficient numerical method has not yet been developed that can be used for estimating the influence of friction on cable force distribution. Thus, this study proposes an efficient friction element to simulate friction between cable and joint. A flowchart for estimating the value of friction force is introduced. These novel numerical methods were adopted to estimate the influence of friction on cable force distribution. The accuracy and efficiency of these numerical methods were validated through numerical tests.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2010년도 정기 학술대회
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• pp.783-786
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• 2010

This paper presents a finite element analysis on impedance parameters of anchor plates of structural cables under the change in cable forces. To achieve the objective, four approaches are implemented as follows: Firstly, theoretical background of electro-mechanical impedance is described. Secondly, anchor plates of structural cables are selected to experimentally examine the relationship between impedance parameters and cable force changes. Thirdly, finite element analysis is performed to verify the experimental results. Fourthly, a comparison between the experimental and numerical analysis on impedance parameters of anchor plate of structural cables under cable force changes is carried out.

• 한국공간구조학회논문집
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• 제5권4호
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• pp.79-90
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• 2005

본 연구의 주 목적은 다양한 요인에 의해 케이블-막구조물에 요소이동이 발생할 때, 당초 해석 시 가정되었던 좌표나 응력상태의 변화에 대해 막과 케이블 사이에 발생하는 요소이동의 방향이나 크기를 산정하고, 요소이동이 발생한 후 응력상태의 변화를 규명하는 것이다. 먼저 케이블 보강 막구조물의 요소이동 문제를 해석하기 위한 이론적 배경인 ALE 유한요소법의 개념을 소개하고, ALE 개념이 도입된 케이블-막구조물에서의 요소이동을 고려한 강성매트릭스를 작성하여 해석 프로그램을 개발한다. 개발된 프로그램의 타당성을 검증하기 위해 다양한 예제 해석을 수행한다.

• 한국구조물진단유지관리공학회 논문집
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• 제9권2호
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• pp.137-146
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• 2005

본 연구는 형상반복법과 수정 라그랑쥐 방법으로 사장교 케이블의 초기장력과 기준길이를 계산하였다. 사장교의 거더와 주탑은 3차원 frame 요소로, 케이블은 비선형 트러스요소와 Ernst의 케이블 요소로 이상화하였다. 본 연구의 유한요소법에 의한 케이블의 초기장력과 실무에서 사용하는 시산법에 의한 케이블의 장력을 비교한 결과, 전자의 경우가 후자의 경우보다 적음을 알 수 있었다. 케이블의 기준길이는 비선형 트러스요소를 사용한 해석결과와 Ernst의 케이블 요소를 사용한 해석결과를 비교하였으며 두 가지 해석결과가 거의 일치함을 알 수 있었다. 또한 기준길이는 초기장력값을 나타내는 단순교의 지간과 거의 일치함을 알 수 있었다. 따라서 케이블의 기준 길이는 본 연구로부터 얻은 초기장력을 가진 단순보의 호의 길이를 나타냄을 알 수 있었다.