基于材料强度既有统计参数的梁桥地震易损性简化分析方法

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摘要为了研究简化的地震易损性方法在桥梁中的应用，通过寻求材料不确定性的统计规律，达到简化易损性分析的目的，本文提出了两种易损性简化分析方法。针对我国实际工程中应用最为广泛的某梁式桥梁，采用拉丁超立方抽样来进行结构材料不确定性组合，对桥梁的三维有限元模型，选用了10条天然地震动，利用结构主要材料既有的统计规律，对比研究了两种易损性简化分析与常规基于位移的地震易损性分析方法的计算结果。研究结果表明：采用简化分析方法一得到的桥梁结构地震需求超过其性能水平的超越概率要小于常规基于位移的地震易损性分析方法的计算结果，其结果偏于不安全，而且有一定的误差；采用简化方法二绘制的易损性曲线比简化方法一绘制的易损性曲线更接近常规方法的，其误差更小，其分析结果偏于安全。采用本文的简化分析方法之二，将大幅减少分析样本数量，在实际工程中可以用来对桥梁结构地震破坏状态概率进行近似估计。

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关键词 ：材料强度, 统计参数, 易损性简化分析, 拉丁超立方, 位移

Abstract：In order to study the application of simplified seismic vulnerability analysis methods in bridge, through seeking the statistical rule of material uncertainty to simplify the vulnerability analysis, two kinds of simplified seismic vulnerability analysis methods were proposed. In view of a beam bridge, which is the most widely used practical projects in china, Latin Hypercube Sampling was used for uncertainty composite of bridge structure materials. Ten natural ground motions were chosen to analysis the three dimensional finite element model of the bridge. The results of the two kinds of simplified seismic vulnerability analysis methods and conventional method were compared through the existing statistical regularity of the structure main material. The results show that exceeding probability of performance level of bridge structure seismic demands that calculate by the first simplified seismic vulnerability analysis method is less than the traditional method. There is some error in the analysis result calculated by the first simplified method, which result is unsafe compared to the traditional method result. Seismic fragility curves calculated by the second simplified method are closer to the fragility curves of traditional method.There is less error, but much safer compared to the first simplified method. The number of analysis samples would be reduced significantly when the second simplified method is taken , which could be used to estimate the seismic damage state probability of bridge structures .

Key words： material strength statistical parameters simplified vulnerability analysis Latin Hypercube Sampling displacement

收稿日期: 2016-07-22 出版日期: 2017-07-15

引用本文:

张云1，3 谭平2 黄佳栋1，2 黎力韬1. 基于材料强度既有统计参数的梁桥地震易损性简化分析方法[J]. 振动与冲击, 2017, 36(14): 227-233.
Zhang Yun1，3,Tan Pin2,Huang Jia-dong1,2 Li Li-tao1. Simplified seismic vulnerability analysis method of beam bridge based on material strength of existing statistical parameters. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(14): 227-233.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I14/227

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