Steel and Composite Structures

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Studies on CFST column to steel beam joints using endplates and long bolts under central column removal

  • Gao, Shan (Shaanxi Key Laboratory of safety and durability of concrete structures, Xijing University) ;
  • Yang, Bo (School of Civil Engineering, Chongqing University) ;
  • Guo, Lanhui (School of Civil Engineering, Harbin Institute of Technology) ;
  • Xu, Man (School of Civil Engineering, Northeast Forestry University) ;
  • Fu, Feng (School of Mathematics, Computer Science & Engineering, University of London)
  • Received : 2019.03.25
  • Accepted : 2021.12.24
  • Published : 2022.01.25
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Abstract

In this paper, four specimens of CFST column joints with endplates and long bolts are tested in the scenario of progressive collapse. Flush endplate and extended endplate are both adopted in this study. The experimental results show that increasing the thickness of the endplate could improve the behavior of the joint, but delay the mobilization of catenary action. The thickness of the endplate should not be relatively thick in comparison to the diameter of the bolts, otherwise catenary action would not be mobilized or work effectively. Effective bending deformation of the endplate could help the formation and development of catenary action in the joints. The performance of flexural action in the joint would affect the formation of catenary action in the joint. Extra middle-row bolts set at the endplates and structural components set below the bottom beam flange should be used to enhance the robustness of joints. A special weld access hole between beam and endplate should be adopted to mitigate the chain damage potential of welds. It is suggested that the structural components of joints should be independent of each other to enhance the robustness of joints. Based on the component method, a formula calculating the stiffness coefficient of preloaded long bolts was proposed whose results matched well with the experimental results.

Keywords

Acknowledgement

The project is supported by National Natural Science Foundation of China (NO. 51908085), Natural Science Foundation of Chongqing (cstc2020jcyj-msxmX0010), Fundamental Research Funds for the Central Universities (2020CDJ-LHZZ-013), and the Youth Innovation Team of Shaanxi Universities (21JP138) which are gratefully acknowledged.

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