Steel and Composite Structures

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Seismic behavior of thin-walled CFST pier-to-base connections with tube confined RC encasement

  • Xuanding Wang (School of Civil Engineering, Chongqing University) ;
  • Yue Liao (School of Civil Engineering, Chongqing University) ;
  • Jiepeng Liu (School of Civil Engineering, Chongqing University) ;
  • Ligui Yang (State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University) ;
  • Xuhong Zhou (School of Civil Engineering, Chongqing University)
  • Received : 2022.11.28
  • Accepted : 2023.11.07
  • Published : 2024.01.25
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Abstract

Concrete-filled steel tubes (CFSTs) nowadays are widely used as the main parts of momentous structures, and its connection has gained increasing attention as the complexity in configuration and load transfer mechanism. This paper proposes a novel CFST pier-to-footing incorporating tube-confined RC encasement. Such an innovative approach offers several benefits, including expedited on-site assembly, effective confinement, and collision resistance and corrosion resistance. The seismic behavior of such CFST pier-to-footing connection was studied by testing eight specimens under quasi-static cyclic lateral load. In the experimental research, the influences on the seismic behavior and the order of plastic hinge formation were discussed in detail by changing the footing height, axial compression ratio, number and length of anchored bars, and type of confining tube. All the specimens showed sufficient ductility and energy dissipation, without significant strength degradation. There is no obvious failure in the confined footing, while local buckling can be found in the critical section of the pier. It suggests that the footing provides satisfactory strength protection for the connection.

Keywords

Acknowledgement

The research described in this paper was financially supported by the National Natural Science Foundation of China (Grant number: 51908086, and U20A20312), both of which are gratefully acknowledged.

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