Steel and Composite Structures

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Study on the progressive collapse resistance of CP-FBSP connections in L-CFST frame structure

  • Xiong, Qingqing (Key Laboratory of Roads and Railway Engineering Safety Control (Shijiazhuang Tiedao University), Ministry of Education) ;
  • Wu, Wenbo (School of Civil Engineering, Shijiazhuang Tiedao University) ;
  • Zhang, Wang (Key Laboratory of Roads and Railway Engineering Safety Control (Shijiazhuang Tiedao University), Ministry of Education) ;
  • Chen, Zhihua (Department of Civil Engineering, Tianjin University) ;
  • Liu, Hongbo (Department of Civil Engineering, Tianjin University) ;
  • Su, Tiancheng (Dali Construction Group Corporation Limited)
  • Received : 2020.11.02
  • Accepted : 2022.07.29
  • Published : 2022.08.10
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Abstract

When the vertical load-bearing members in high-rise structures fail locally, the beam-column joints play an important role in the redistribution of the internal forces. In this paper, a static laboratory test of three full-scale flush flange beam-reinforced connections with side and cover plates (CP-FBSP connection) with double half-span steel beams and single L-shaped columns composed of concrete-filled steel tubes (L-CFST columns) was conducted. The influence of the side plate width and cover plate thickness on the progressive collapse resistance of the substructure was thoroughly analyzed. The failure mode, vertical force-displacement curves, strain variation, reaction force of the pin support and development of internal force in the section with the assumed plastic hinge were discussed. Then, through the verified finite element model, the corresponding analyses of the thickness and length of the side plates, the connecting length between the steel beam flange and cover plate, and the vertical-force eccentricity were carried out. The results show that the failure of all the specimens occurred through the cracking of the beam flange or the cover plate, and the beam chord rotations measured by the test were all greater than 0.085 rad. Increasing the length, thickness and width of the side plates slightly reduced the progressive collapse resistance of the substructures. The vertical-force eccentricity along the beam length reduced the progressive collapse resistance of the substructure. An increase in the connecting length between the beam flange and cover plate can significantly improve the progressive collapse resistance of substructures.

Keywords

Acknowledgement

This work was sponsored by the National Natural Science Foundation of China (grant No. 52008270), the Youth Program of the Natural Science Foundation of Hebei Province, China (grant No. E2020210003), the Key Research and Development Program of Hebei Province, China (22375409D) and the Project of the Science and Technology Research Foundation of Hebei Colleges and Universities, China (grant Nos. ZD2022040 and QN2020409).

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