摘要
针对地震动存在行波效应、场地效应、不相干效应等因素，分析大跨连续钢构桥在一致地震激励输入响应时结构内力和变形会被偏估问题，考虑结构及地震动不确定性，采用蒙特卡罗方法建立一致激励与多点激励两种工况下大跨连续钢构桥-地震动系统随机样本。以桥墩位移延性比表示桥梁破坏状态阶段，对桥梁易损性进行分析，给出大跨连续钢构桥结构的易损性曲线，得到同样程度破坏的多点地震激励与一致地震激励下加速度峰值关系。
Abstract
Due to wave passage effect, incoherence effect, local effect and other factors in seismic ground motion, the internal force and deformation of long span continuous rigid framed bridges will be error-estimated when seismic responses analysis is performed under identical support ground motion excitations. A Monte Carlo simulation method is used to establish the random sample (large-span continuous rigid frame bridge and ground motion), by means of considering the uncertainties of the structural material and ground motion, both for identical support ground motion excitations and multiple support ground motion excitations. The ductility ratio of piers is defined as the damage state of the bridge. And the seismic fragility analysis is carried out for two different excitation method and the fragility curves of the bridge are given base on the damage state definition. The peak acceleration relationship of different excitation methods is obtained under the same level damage.
关键词
地震动 /
多点激励 /
不确定性 /
易损性曲线 /
回归分析
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Key words
Ground motion /
multiple support excitations /
uncertainly /
fragility curve /
regressive analysis
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李吉涛;杨庆山;刘阳冰 .
多点地震激励下大跨连续钢构桥易损性分析[J]. 振动与冲击, 2013, 32(5): 75-80
LI Ji-tao;YANG Qing-shan;LIU Yang-bing.
Fragility analysis of long span continuous rigid frame bridge under multi-support excitations[J]. Journal of Vibration and Shock, 2013, 32(5): 75-80
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