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工程力学  2014 

基于Nataf变换的桥梁结构地震易损性分析

DOI: doi:10.6052/j.issn.1000-4750.2012.12.0959, PP. 93-100

Keywords: 桥梁地震易损性,Nataf变换,概率地震需求分析,结构随机参数相关性,均匀设计

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Abstract:

地震易损性分析是美国太平洋地震工程研究中心(PEER)提出的“性能化地震工程”理论框架的重要一环.目前所采用的易损性分析方法大多未考虑结构的不确定性及结构随机参数之间的相关性.为此,引入均匀设计考虑结构参数的随机性,同时结合Nataf变换,处理结构随机参数之间的相关性.提出一种综合考虑地震动随机性、结构参数随机性及结构随机参数相关性的桥梁结构地震易损性分析方法.以一座三跨连续梁为例,分别在考虑结构随机参数相关性和不考虑结构参数相关性的前提下计算其地震易损性.分析结果表明:提出的方法能够有效考虑结构随机参数相关性;忽视结构随机参数相关性会导致高估桥梁结构地震易损性.

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