Analysis on Factors Affecting the Capability of Collapse of Reinforced Concrete

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Analysis on Factors Affecting the Capability of Collapse of Reinforced Concrete

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[1]CHEN Weihong,LIU Fanghao,QIAO Zehui,et al.Analysis on Factors Affecting the Capability of Collapse of Reinforced Concrete[J].Journal of Zhengzhou University (Engineering Science),2021,42(02):31-37.[doi:10.13705/j.issn.1671-6833.2021.02.007]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 42 Number of periods: 2021 02 Page number: 31-37 Column: Public date: 2021-04-12

Title:: Analysis on Factors Affecting the Capability of Collapse of Reinforced Concrete

Author(s):: CHEN Weihong1; LIU Fanghao1; QIAO Zehui1; CUI Shuangshuang2; School of Civil Engineering, Fuzhou University; School of Civil Engineering, Fujian Institute of Engineering;

Keywords:: RC frame structure; progressive collapse; catenary action; column loss; reinforcement ratio

CLC:: -

DOI:: 10.13705/j.issn.1671-6833.2021.02.007

Abstract:: In order to examine on the factors to collapse resistance of the structure, the ABAQUS finite element model was firstly verified and calibrated by using the progressive collapse test results of the two-layer concrete plane frame. Then 15 three-story and four-span concrete plane frames were established to carry out the progressive collapse analysis on three parameters based on the verified model. The parameters included the failure of the middle column of the different layers, the reinforcement ratio at the bottom of the beams, and the reinforcement ratio at the top of the beams. The results showed that the lower the floor where the failure of the center column is, the more difficult the catenary action is to play a role. The improvement of the reinforcement ratio at the bottom of the beams had no positive effect on the catenary action. The catenary action of the structure was weakened when the reinforcement ratio was too high. The increase in the reinforcement ratio of the upper part of the beam could significantly enhance the catenary action of the structure. The energy dissipation at the catenary action accounted for at least 70% of the total energy dissipation during the collapse process. Thus, the contribution of the catenary action should be considered when evaluating the structural robustness.

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