Seismic fragility analysis for isolated bridges with flexible column pier

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (16) : 48-54.

ZHANG Yun1,2，TAN Ping1，ZHENG Jian-xun1，ZHOU Fu-lin1

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Abstract

Lower member of smaller stiffness , such as flexible column pier, has become the most widespread structure in small or medium-span bridge. For this type of bridge, using the LRB bilinear restoring force characteristics by adjusting the overall stiffness of the bridge substructure to change the seismic force distribution between different piers can improve the overall seismic capacity. Five states of bridge injury are defined, quantitative indicators based on curvature ductility to determine the level of these five kinds of damage are summarized, and with the bridge pier top displacement associated. Typical bridge is selected to establish finite element model for dynamic elastic-plastic analysis, pier top displacement probability demand and seismic vulnerability of the bridge before and after isolation were compared, the analysis shows that, for the adoption of the flexible column pier structure, after reasonable isolation transformation, as long as the system to ensure the normal operation of isolation bearings, bridge seismic level of overall improvement in the earthquake effect is evident.

Key words

Isolated bridge / flexible column pier / fragility analysis / damage index / LRB

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ZHANG Yun1,2，TAN Ping1，ZHENG Jian-xun1，ZHOU Fu-lin1. Seismic fragility analysis for isolated bridges with flexible column pier[J]. Journal of Vibration and Shock, 2015, 34(16): 48-54

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