Earthquakes and Structures

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Component deformation-based collapse evaluation of RC frame under different collapse criteria

  • Huang, Difang (School of Civil Engineering and Transportation, South China University of Technology) ;
  • Han, Xiaolei (School of Civil Engineering and Transportation, South China University of Technology) ;
  • Qiao, Shengfang (Guangzhou Institute of Building Science Co., Ltd.) ;
  • Ji, Jing (School of Civil Engineering and Transportation, South China University of Technology) ;
  • Cui, Jidong (RBS Architectural Engineering Design Associates)
  • Received : 2020.06.13
  • Accepted : 2021.05.11
  • Published : 2021.08.25
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Abstract

Developments in performance-based earthquake engineering have emphasized the importance of evaluation of structural collapse resistance. Several collapse criteria were proposed to define structural collapse in various perspective. In this paper, collapse resistant capacity of ductile reinforced concrete (RC) frame was evaluated using different collapse criteria. Since most of the criteria focus on overall structural response, a component deformation-based method was adopted to describe the damage in component level. Incremental dynamic analysis (IDA) of a 6-story ductile RC frame conforms to current codes was conducted in OpenSEES. The collapse resistant capacity under different collapse criteria was compared. Moreover, relationship between overall structural response and the distribution of damaged components were discussed through the component deformation-based method. It was indicated that the story of maximum inter-story drift ratio is neither consistent with the one which is most seriously damaged nor with the story of maximum residual inter-story drift ratio. Furthermore, the component deformation-based method can depict structural damaged state and formation of collapse mechanism more reasonably. The analysis result evidences that structure conforms to current code have the good ductility and hardly reaches physical collapse under rare earthquake, however, the structure is more likely to be demolished due to unacceptable residual deformation.

Keywords

Acknowledgement

The research described in this paper is financially supported by Natural Science Foundation of Guangdong Province (2020A1515010739), Science and Technology Program of Guangzhou (202103000038) and China Postdoctoral Science Foundation (2019M662917).

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