Seismic risk analysis of bridge structure considering pile diameter effect

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (15) : 224-231.

WAN Huaping1, WEI Zhicheng2, SU Lei3, REN Weixin4

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Abstract

Pile-soil-structure interaction is an important problem in seismic response analysis of bridge structures, where pile diameter effect should not be ignored. Here, taking a three-span continuous beam bridge as an example, effects of pile diameter effect on bridge seismic risk was studied. Three kinds of finite element models of model1 simultaneously considering pile-soil-structure interaction and pile diameter effect, model2 considering pile-soil-structure interaction but not pile diameter effect and model 3 being a simplified model of pier bottom fixed were established. The seismic vulnerability curve and seismic risk curve of the bridge structure were calculated with the incremental dynamic analysis method. The contrastive analysis was performed for the calculation results of the three models. The results showed that model1 simultaneously considering pile-soil-structure interaction and pile diameter effect has the highest seismic vulnerability and seismic risk; model 3 with pier bottom fixed has the lowest seismic vulnerability and seismic risk.

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seismic risk analysis / seismic fragility / girder bridge structure / pile diameter effect / incremental dynamic analysis

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WAN Huaping, WEI Zhicheng, SU Lei, REN Weixin. Seismic risk analysis of bridge structure considering pile diameter effect[J]. Journal of Vibration and Shock, 2021, 40(15): 224-231

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