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Non-linear Dynamic Analysis of Reinforced Concrete Slabs Subjected to Explosive Loading Using an Orthotropic Concrete Constitutive Model

이등방성 콘크리트 모델을 이용한 폭발하중을 받는 철근콘크리트 슬래브의 비선형 동적해석

  • Lee, MinJoo (Division of Civil and Environmental Engineering, KAIST) ;
  • Kwak, Hyo-Gyoung (Division of Civil and Environmental Engineering, KAIST)
  • 이민주 (한국과학기술원 건설 및 환경공학과) ;
  • 곽효경 (한국과학기술원 건설 및 환경공학과)
  • Received : 2019.10.29
  • Accepted : 2019.11.30
  • Published : 2019.12.31

Abstract

An improved numerical model for non-linear analysis of reinforced concrete (RC) slabs subjected to blast loading is proposed. This approach considers a strain rate dependent orthotropic constitutive model that directly determines the stress state using the stress-strain relation acquired from the data obtained using the biaxial strength envelope. Moreover, the bond-slip between concrete and reinforcing steel is gradually enlarged after the occurrence of cracks and is concentrated in the plastic hinge region. The bond-slip model is introduced to consider the crack direction of the concrete under a biaxial stress state. Correlation studies between the numerical analysis and the experimental results were performed to evaluate the analytical model. The results show that the proposed model can effectively be used in dynamic analyses of reinforced concrete slab members subjected to explosive loading. Moreover, it was determined that it is important to consider biaxial behavior in the material model and the bond-slip effect.

Acknowledgement

Supported by : 한국연구재단

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