柱式柔性墩隔震梁桥结构地震易损性分析

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摘要对柱式柔性桥墩刚度较小下部构件结构形式的中小跨径桥梁，利用铅芯橡胶支座双线性恢复力特性，通过调节桥梁下部结构整体刚度，改变地震力在不同墩柱间的分配可提升桥梁整体抗震能力。定义桥梁损伤的5种状态，归纳出以曲率延性判定5种损伤水平的量化指标，并与桥墩墩顶位移相关联。选典型桥梁建立有限元模型进行动力弹塑性分析，将隔震改造前后桥梁墩顶位移概率需求与地震易损性进行对比。分析表明，采用柔性桥墩的梁桥结构进行合理隔震改造后，只要保证隔震支座体系正常运行，桥梁整体在大震作用下的抗震水平可明显提升。

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	张云1
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	谭平1
	郑建勋1
	周福霖1

关键词 ：隔震桥梁, 柱式柔性墩, 易损性分析, 损伤水平, 铅芯橡胶支座

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

收稿日期: 2014-08-22 出版日期: 2015-08-25

引用本文:

张云1,2，谭平1，郑建勋1，周福霖1. 柱式柔性墩隔震梁桥结构地震易损性分析[J]. 振动与冲击, 2015, 34(16): 48-54.
ZHANG Yun1,2，TAN Ping1，ZHENG Jian-xun1，ZHOU Fu-lin1. Seismic fragility analysis for isolated bridges with flexible column pier. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(16): 48-54.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2015/V34/I16/48

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