桥梁易损性曲线计算方法研究

发布时间：2018-02-04 21:07

本文关键词： 易损性曲线桥梁结构非线性静力分析方法非线性动力分析方法　出处：《结构工程师》2014年04期 　论文类型：期刊论文

【摘要】：易损性曲线在结构抗震评估方面有着非常重要的作用,计算易损性曲线的方法也越来越多地被研究和发展。针对钢筋混凝土连续梁桥结构,以曲率延性为判断不同损坏等级的依据,采用四种非线性静力分析方法(承载力反应谱法、N2法、改进的模态Pushover分析法以及自适应承载力反应谱法)计算其在地震作用下的易损性曲线,并以动力分析结果作为方法比较的标准值,对比以上四种静力方法计算的结果。研究表明,N2方法不仅可以大大缩短计算时间,并且可以给出十分接近非线性动力分析的结果。
[Abstract]:Vulnerability curves play an important role in seismic assessment of structures. The method of calculating vulnerability curves is also more and more studied and developed. Based on curvature ductility, four kinds of nonlinear static analysis methods (bearing capacity response spectrum method and N2 method) are used to judge different damage grades. The improved modal Pushover analysis method and the adaptive bearing capacity response spectrum method are used to calculate the vulnerability curves under earthquake action, and the results of dynamic analysis are taken as the standard values compared with the method. Compared with the results obtained by the four static methods mentioned above, it is shown that the N _ 2 method can not only greatly shorten the calculation time, but also give the results which are very close to the nonlinear dynamic analysis.
【作者单位】：同济大学结构工程与防灾研究所;
【分类号】：U442.55;U441
【正文快照】： 1概述结构易损性曲线(Fragility Curves)定义为在不同强度地震作用下结构发生破坏的概率。当某一地区的地震灾害等级确定后,该地区桥梁的易损性曲线便可以根据已知地区的地震动参数(IM)范围,计算出对应地震动参数下桥梁结构或构件地震损伤指标(DI)超过其承载力(C)的概率,表达

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