콘크리트학회논문집 (Journal of the Korea Concrete Institute)

  • 제13권6호
  • /
  • Pages.637-644
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  • 2001
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  • 1229-5515(pISSN)
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  • 2234-2842(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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콘크리트 댐의 비선형 지진해석에서의 유한요소망 영향

Finite Element Mesh Dependency in Nonlinear Earthquake Analysis of Concrete Dams

  • 이지호 (동국대학교 토목환경공학과)
  • 발행 : 2001.12.01
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초록

본 논문에서는 콘크리트 댐체의 균열 발생 및 진전해석을 포함하는 비선형 지진해석에서 유한요소망 의존성을 제거시키고 안정적인 해를 얻기 위하여 균열모형으로 사용되는 소성손상모형 및 손상역학모형을 duvaut-lions모형에 기초한 점소성모형으로 정규화하는 방법을 기술하였다. 제안된 방법으로 정규화된 소성손상모형과 그렇지 않은 소성손상모형를 이용하여 지진하중을 받는 콘크리트 댐체의 동적 손상해석을 수행하여 여러 형태의 유한요소망이 해석결과에 미치는 영향을 분석하였다. 해석결과로부터 정규화한 소성손상모형은 유한요소망의 크기 및 배열에 영향을 크게 받지 않고 객관적이며 안정적인 해를 계산하는 반면, 정규화되지 않은 균열모형은 요소망에 의존적인 불안정한 결과를 산출함을 관찰할 수 있었다.

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.

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참고문헌

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