• Title, Summary, Keyword: 유한요소 해석

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An Expert Finite Element Discretization for Time-Dependent Structural Problems (시간 종속 구조응력해석을 위한 전문가 유한요소 모델링)

  • 주관정
    • Computational Structural Engineering
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    • v.3 no.3
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    • pp.125-131
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    • 1990
  • A finite element technique for the time dependent large structural problems is presented. It is based on the error estimation for the bases of solution spaces. An a-posteriori energy norm of residual error serves as the error indicator. Mode shapes which are calculated by scaling the Ritz vectors are applied to discretize the continuous spatial domain. Finally, the performance of the proposed methods is demonstrated by solving simple examples.

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Nonlinear Finite Element Analysis of PHWR Containment Building (가압중수형 격납건물의 비선형 유한요소해석)

  • Lee, Hong-Pyo;Song, Young-Chul
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.287-290
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    • 2009
  • 이 논문에서는 가압중수형(Pressurized Heavy Water Reactor) 프리스트레스 콘크리트 격납건물의 1/4 축소모델에 대한 극한내압능력과 전반적인 비선형거동에 관한 유한요소 해석을 수행하였다. 가압중수형 격납건물은 원통형 벽체와 돔으로 구성되었고, 4개의 부벽을 갖는다. 유한요소해석을 위해서 상용코드 ABAQUS를 이용하였고, 콘크리트, 철근 및 텐던에 대한 수치모델링을 작성하여 자중과 내압하중을 적용하였고, 텐던의 2% 변형률을 기준으로 극한내압능력을 평가하였다. 이때 사용된 재료모델로 콘크리트는 Concrete Damaged Plasticity 모델을 사용하였고, 철근과 텐던은 Elasto-Plastic 모델을 적용하였다. 유한요소 해석결과 콘크리트의 초기균열 0.41MPa에서 발생하였고, 극한내압은 0.56MPa 정도로 평가되었다.

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Three-dimensional Finite Element Studies of the Behavior of Short Pile Subjected to Lateral Load near a Sandy Slope (모래사면에 설치된 수평하중을 받는 짧은 말뚝의 거동에 관한 3차원 탄소성 유한요소해석)

  • ;Ugai Keizo;Wakai Akihiko
    • Journal of the Korean Geotechnical Society
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    • v.17 no.3
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    • pp.41-50
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    • 2001
  • 본 연구는 모래사면의 언덕근처에 설치된 짧은 말뚝의 수평하중의 영향에 관한 것이다. 3차원 탄소성 유한요소법해석과 실내 모형실험의 결과를 비교하였다. 경사 30$^{\circ}$의 사면에 시공된 짧은 말뚝의 특성을 파악하기 위해, 사면언덕에서 모형말뚝까지의 거리를 3종류로 상이하게 하여, 모형실험을 실시하였다. 사용된 모래의 지반특성은 배수조건하의 삼축압축실험으로 결정하였다. 동시에 3차원 탄소성 유한요소법에 의한 수치해석결과와 모형실험결과를 비교하였다. 본 유한요소법의 해석에 있어서 모래지반을 탄성완전소성모델(Elastic-perfectly plastic model)로 가정하여, 파괴기준으로 Mohr-Coulomb 식과 소성 포텐셜에 대해서는 Drucker-Prager 식을 적용한 MC-DP 모델로 하였다. 이러한 MC-DP 모델의 구성식은 유한요소법에서 있어 계산치의 수렴에 유익하다. 3차원 탄소성 유한요소법에 의한 수치해석이 사질토 사면의 언덕 부근에 설치된 단하의 수평거동에 대한 파악에 유효하다는 것을 확인하였다.

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A Study on the Performance Assessment of BARCOM Model (BARCOM 모델의 성능평가에 관한 연구)

  • Lee, Hong-Pyo;Jang, Jung-Bum;Hwang, Kyeong-Min;Song, Young-Chul
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.388-391
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    • 2011
  • 이 논문에서는 인도의 BARC에서 가압중수형 격납건물의 선형탄성 거동 및 균열의 발생형상과 극한내압 평가를 위해서 건설한 1/4 축소모델 격납건물에 대하여 실험한 결과와 유한요소 해석에 의한 결과를 비교 분석하였다. 유한요소 해석은 상용프로그램인 ABAQUS를 이용하였고 각각의 구조재료에 대한 수치 해석모델을 작성하여 내압해석을 수행하였다.

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Finite Element Eigen Analysis of Undamped Beam Structure with Composite Sections (복합단면을 갖는 비 감쇠 보 구조물의 유한요소 고유치 해석)

  • Park, Keun-Man;Cho, Jin-Rae;Jung, Weui-Bong;Bae, Soo-Ryong
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.20 no.6
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    • pp.691-697
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    • 2007
  • Numerical eigen analysis of beam-like structure can be easily and effectively done by various conventional beam theory-based methods. However, in case of the structures composed of composite-sectioned beams, the application of conventional numerical methods requires one to derive both equivalent material and geometry properties. In the present paper, these equivalent properties are derived by the transformed section method and the test FEM program is coded. The numerical accuracy of the proposed method is verified through the comparison with the ANSYS 3-D model.

유한요소해석을 통한 인체의 생체역학적 평가

  • Bae, Ji-Yong;Jeon, In-Su
    • Journal of the KSME
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    • v.50 no.2
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    • pp.42-46
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    • 2010
  • 이 글에서는 인체의 유한요소 모델링과 해석 과정의 전반적인 소개 및 무릎관절을 중심으로 각각의 과정에 대한 적용방법을 상세히 알아보고, 유한요소해석을 통한 인체의 생체역학적 평가에 관한 적용사례를 소개하고자 한다.

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Finite Element Mesh Dependency in Nonlinear Earthquake Analysis of Concrete Dams (콘크리트 댐의 비선형 지진해석에서의 유한요소망 영향)

  • 이지호
    • Journal of the Korea Concrete Institute
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    • v.13 no.6
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    • pp.637-644
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    • 2001
  • A regularization method based on the Duvaut-Lions viscoplastic scheme for plastic-damage and continuum damage models, which provides mesh-independent and well-posed solutions in nonlinear earthquake analysis of concrete dams, is presented. A plastic-damage model regularized using the proposed rate-dependent viscosity method and its original rate-independent version are used for the earthquake damage analysis of a concrete dam to analyze the effect of the regualarization and mesh. The computational analysis shows that the regularized plastic-damage model gives well-posed solutions regardless mesh size and arrangement, while the rate-independent counterpart produces mesh-dependent ill-posed results.

Seismic Analysis of Chemical Pump Using Automatic Mesh Generation System (자동요소생성 시스템을 이용한 케미컬 펌프의 지진해석)

  • Jang, Hyun-Seok;Lee, Joon-Seong
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.24 no.6
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    • pp.685-690
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    • 2011
  • This paper describes a seismic analysis of chemical pump using automated mesh generation system. The use of an automated analysis system, involving FE codes together with CAD systems and FE pre- and post-processors, has provided an important step towards shortening the design process and structural optimization. The FE model, which is a FE mesh accompanied with the analysis condition, is automatically converted from the analysis model. The FE models are then automatically analyzed using the FE analysis code. This integrated FE simulation system is applied to an analysis of three-dimensional complex solid structures such as a chemical pump.

Efficient Adaptive Finite Element Mesh Generation for Dynamics (동적 문제에 효율적인 적응적 유한요소망)

  • Yoon, Chongyul
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.26 no.5
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    • pp.385-392
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    • 2013
  • The finite element method has become the most widely used method of structural analysis and recently, the method has often been applied to complex dynamic and nonlinear structural analyses problems. Even for these complex problems, where the responses are hard to predict, finite element analyses yield reliable results if appropriate element types and meshes are used. However, the dynamic and nonlinear behaviors of a structure often include large deformations in various portions of the structure and if the same mesh is used throughout the analysis, some elements may deform to shapes beyond the reliable limits; thus dynamically adapting finite element meshes are needed in order for the finite element analyses to be accurate. In addition, to satisfy the users requirement of quick real run time of finite element programs, the algorithms must be computationally efficient. This paper presents an adaptive finite element mesh generation scheme for dynamic analyses of structures that may adapt at each time step. Representative strain values are used for error estimates and combinations of the h-method(node movement) and the r-method(element division) are used for mesh refinements. A coefficient that depends on the shape of an element is used to limit overly distorted elements. A simple frame example shows the accuracy and computational efficiency of the scheme. The aim of the study is to outline the adaptive scheme and to demonstrate the potential use in general finite element analyses of dynamic and nonlinear structural problems commonly encountered.

Evaluation on Flexural Performance of Precast Decks with Ribbed Joint by FEM (유한요소해석에 의한 요철형 이음단면을 갖는 프리캐스트 바닥판의 휨성능 평가)

  • Oh, Hyun-Chul;Chung, Chul-Hun;Kang, Myoung-Gu;Park, Se-Jin;Shin, Dong-Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.20 no.1
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    • pp.85-94
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    • 2016
  • In this study, a non-linear FEM model is presented to predict the static flexural performance of precast bridge decks with ribbed joint and is verified with previous experiment results through comparison. The several theory of material properties were applied to each mechanical properties in FEM model and FEM model's input variables were determined through experiment result and parametric study. The FEM results showed good accuracy in predicting the structural performance of the specimens and FEM model's average error rate was 5%. Also, each specimen's cracking aspect and failure mode can be predicted through FEM's plastic strain distribution. Thus, this FEM model can be used effectively for predicting the ultimate behavior and parametric study to development of design formula for joint.