A Tensile Criterion to Minimize FE Mesh-Dependency in Concrete Beam under Blast Loading

Hyo-Gyoung Kwak; HanGul Gang

doi:10.7734/COSEIK.2017.30.2.137

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A Tensile Criterion to Minimize FE Mesh-Dependency in Concrete Beam under Blast Loading 폭발하중을 받는 콘크리트 보의 요소의존성 최소화 인장기준식

2017. pp. 137-143

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Abstract

A tensile failure criterion that can minimize the mesh-dependency of simulation results on the basis of the fracture energy concept is introduced, and conventional plasticity based damage models for concrete such as CSC model and HJC model, which are generally used for the blast analyses of concrete structures, are compared with orthotropic model in blast test to verify the proposed criterion. The numerical prediction of the time-displacement relations in mid span of the beam during blast loading are compared with experimental results. Analytical results show that the numerical error is substantially reduced and the accuracy of numerical results is improved by applying a unique failure strain value determined according to the proposed criterion.

Keywords

high strain rate concrete

blast simulation

failure strain

mesh-dependency

fracture energy

본 논문에서는 파괴에너지이론에 기초하여 요소의존성을 최소화할 수 있는 인장파괴기준식을 제안하고 HJC(holmquist johnson cook), CSC(continuous surface cap), Orthotropic 모델을 이용한 폭발수치해석을 통해 기준식을 검증하였다. 폭발하 중으로 인한 RC 보의 시간에 따른 중앙지점의 처짐을 실험결과와 비교하였다. 그 결과 기준식을 통해 산정된 파괴변형률을 수치해석상에 적용해줌으로써 해석결과의 요소의존성이 감소하였고 해의 정확성 또한 향상되는 것을 파악할 수 있었다.

키워드

고율변형 콘크리트

폭발수치해석

파괴변형률

요소(mesh)의존성

파괴에너지

References

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Information

Publisher :Computational Structural Engineering Institute of Korea
Publisher(Ko) :한국전산구조공학회
Journal Title :Journal of the Computational Structural Engineering Institute of Korea
Journal Title(Ko) :한국전산구조공학회 논문집
Volume : 30
No :2
Pages :137-143
Received Date : 2016-12-29
Revised Date : 2017-01-03
Accepted Date : 2017-01-10
DOI :https://doi.org/10.7734/COSEIK.2017.30.2.137

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

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