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<p>When prefabricated bridge piers are applied in high seismic risk regions, seismic safety becomes one of the primary limiting factors. Concrete-filled steel tube (CFST) structures with exceptional mechanical characteristics are integrated into the system to form a CFST composite system, facilitating improved seismic performance. Accordingly, this paper developed a prefabricated CFST stiff skeleton column-bent cap joint, in which the stiff skeleton was embedded in the column. The prefabricated column and bent cap were connected using grouted steel tubes and connecting steel bars. Cyclic loads were applied to the developed joint, and their seismic response was comprehensively evaluated. In accordance with the force characteristics of the joint damage area, lateral strength models were developed, thereby informing the formulation of the joint’s seismic design framework. The results indicated that the joint’s failure mode involved buckling and fracture of the column limb steel tubes at the connection surface, exhibiting excellent energy dissipation capacity, lateral strength, and displacement ductility. The errors in the lateral strength models for the joints were below 10%. The seismic design framework for the joint effectively ensured that its design met ductility requirements.</p>

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Seismic response of prefabricated CFST stiff skeleton column-bent cap joint: experimental evaluation and lateral strength model

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Zhixin Zhu,
  • Qiang Han,
  • Guangda Zhang,
  • Xianzhuo Jia,
  • Li Xu,
  • Xiuli Du

摘要

When prefabricated bridge piers are applied in high seismic risk regions, seismic safety becomes one of the primary limiting factors. Concrete-filled steel tube (CFST) structures with exceptional mechanical characteristics are integrated into the system to form a CFST composite system, facilitating improved seismic performance. Accordingly, this paper developed a prefabricated CFST stiff skeleton column-bent cap joint, in which the stiff skeleton was embedded in the column. The prefabricated column and bent cap were connected using grouted steel tubes and connecting steel bars. Cyclic loads were applied to the developed joint, and their seismic response was comprehensively evaluated. In accordance with the force characteristics of the joint damage area, lateral strength models were developed, thereby informing the formulation of the joint’s seismic design framework. The results indicated that the joint’s failure mode involved buckling and fracture of the column limb steel tubes at the connection surface, exhibiting excellent energy dissipation capacity, lateral strength, and displacement ductility. The errors in the lateral strength models for the joints were below 10%. The seismic design framework for the joint effectively ensured that its design met ductility requirements.