Seismic performance assessment of a precast segmental column bridge considering soil−structure interaction and depth-varying multi-support ground motion inputs
Yucheng DIAO , Chao LI , Hongnan LI , Huihui DONG , Ertong HAO
Front. Struct. Civ. Eng. ›› 2025, Vol. 19 ›› Issue (9) : 1478 -1492.
Seismic performance assessment of a precast segmental column bridge considering soil−structure interaction and depth-varying multi-support ground motion inputs
The precast segmental column (PSC) plays a vital role in both the design of new bridges and the rehabilitation of existing ones. Previous studies of PSCs have primarily focused on their individual seismic behavior. However, research on the seismic performance of entire bridges supported by PSCs, particularly those incorporating soil−structure interaction (SSI), remains limited. Moreover, the amplification of earthquake waves as they propagate along the pile foundation to the surface, coupled with the coherency loss between earthquake motions at varying supports, may further impact the seismic responses of such bridges. This study systematically assesses the seismic performance of a PSC bridge (PSCB) supported by pile foundations considering the effects of SSI and depth-varying multi-support ground motions. Moreover, a benchmark bridge with the traditional monolithic column is also analyzed for comparison. The seismic fragility of bridges is calculated based on nonlinear time history analyses and joint probability density functions for both peak and residual responses. Parameter studies are conducted to reveal the influences of SSI, non-uniform excitation, and depth-varying earthquake loads on seismic performance assessments. This paper offers valuable insights for the reliable analysis of seismic response and fragility and the safety design of PSCB systems.
precast segmental column bridge / soil−structure interaction / depth-varying multi-support ground motions / seismic performance / monolithic column bridge
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Higher Education Press
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