基于多维极限状态函数的桥梁地震易损性分析  

Seismic Vulnerability Analysis of Bridges Based on Multidimensional Limit State Function

作　　者：唐径遥 Tang Jingyao(Changsha High-speed Railway Works Section of China Railway Guangzhou Bureau Group Co.,Ltd.,Changsha 410000,China)

机构地区：[1]中国铁路广州局集团有限公司长沙高铁工务段,长沙市410000

出　　处：《北方交通》2022年第5期9-14,共6页Northern Communications

摘　　要：为了精准评估桥梁地震易损性,以某一连续刚构桥为例,首先采用传统方法进行地震易损性分析,其次考虑到桥梁易损构件支座和桥墩之间可能存在线性相关、非线性相关、完全相关和完全不相关等四种相关性,利用四种多维极限状态函数对桥梁系统的地震易损性进行评估。结果表明:传统方法中桥梁系统地震易损性曲线源于构件的易损性曲线,并且表达为区间的形式,无法准确地描述桥梁系统的破坏情况;基于多维极限状态函数的易损性分析方法可直接利用构件的响应获得桥梁系统的地震易损性曲线;考虑了桥梁关键构件之间存在不同的相关性后得到的桥梁系统地震易损性差异较大,故在后续的地震易损性分析中应充分考虑构件之间的相关性对系统地震易损性的影响。In order to accurately evaluate the seismic vulnerability of a bridge,taking a continuous rigid frame bridge as an example,firstly,the traditional method is used to analyze the seismic vulnerability.Secondly,considering that there may be four kinds of correlations between the bearings and piers of vulnerable components of the bridge,such as linear correlation,nonlinear correlation,complete correlation and zero correlation,four multi-dimensional limit state functions are used to evaluate the seismic vulnerability of the bridge system.The results show that:the seismic vulnerability curve of the bridge system in the traditional method originates from the vulnerability curve of components and is expressed in the form of interval,which cannot accurately describe the damage of the bridge system;the vulnerability analysis method based on multi-dimensional limit state function can directly use the response of components to obtain the seismic vulnerability curve of the bridge system;considering the different correlations between the key components of the bridge,the seismic vulnerability of the bridge system is quite different,so the influence of the correlation between the components on the seismic vulnerability of the system should be fully considered in the subsequent seismic vulnerability analysis.

关 键 词：多维极限状态函数 相关性 界限估计法 地震易损性 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]