동하중을 받는 구조물의 손상해석을 위한 대형균열모형과 수치 알고리즘
Large Crack Model and Its Numerical Algorithm for Damage Analysis of Dynamically Loaded Structures
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초록
본 논문에서는 기존 연속균열모형들이 대형균열 표현에서 소성변형을 과도하게 계산하는 문제점을 극복한 대형균열모형을 제안하였다. 또한 소성손상모형을 수정한 형태로 제안된 균열모형을 수치해석에 사용할 수 있도록 3단계 회귀매핑 알고리즘으로 구성된 알고리즘을 제시하였다. 전산해석 예제들을 통하여 제안된 균열손상모형과 알고리즘이 동적 하중을 받는 구조물의 균열해석문제에서 과도한 소성변형을 억제하는 합리적인 결과를 도출함을 알 수 있었다.
Abstract
In this paper a constitutive model for large cracks in concrete and other brittle materials subject to dynamic and cyclic loading is presented. The suggested model is based on the plastic-damage model for cyclic loading. A numerical formulation based on the three-step return-mapping algorithm for the proposed large crack model is also present. The numerical examples show that the present algorithm works appropriately under dynamic loading and should be used in large crack problems to prevent excessive tensile plastic strain development causing unrealistic results.
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