Seismic fragility analysis for high-pier and long-span bridges in deep water considering pile-soil interaction

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (19) : 210-217.

WU Wenpeng1,2, LIANG Peng2,3, LONG Shiguo2, ZHANG Xuhui2

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Abstract

A certain high-pier long-span continuous rigid frame bridge in deep water was taken as engineering background,considering effects of pile-soilinteraction (PSI), dynamic water pressure and their joint action effect,the finite element analysis model for the bridge was built based on OpenSEES source code analysis platform. 100 near-field earthquake wave records were randomly selected to consider the uncertainty of seismic input, and the peak ground velocity (PGV) was chosen as the seismic intensity parameter. Then, curvatures of both top and bottom of high-pier, and relative displacements of supports were taken as damage indexes to establish probabilistic seismic demand models and seismic fragility curves for the bridge’s different components, and analyze and estimate the seismic performance of the bridge in deep water. The study results showed that dynamic water pressure effect of the bridge in deep water can increase seismic failure probabilities of bridge piers, but failure probabilities of supports can drop slightly; when considering PSI, failure probabilities of pier bottoms and supports can be reduced, but failure probabilities of pier topscan grow; dynamic water pressure and PSI have relatively smaller effects on support vulnerability; effects of dynamic water pressure on the vulnerability of high-pier bridgesare greater than those of PSI.

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high-pier long-span bridge / near-field earthquake / seismic fragility / dynamic water pressure / pile-soilinteraction (PSI)

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WU Wenpeng1,2, LIANG Peng2,3, LONG Shiguo2, ZHANG Xuhui2. Seismic fragility analysis for high-pier and long-span bridges in deep water considering pile-soil interaction[J]. Journal of Vibration and Shock, 2020, 39(19): 210-217

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