基于改进均匀设计响应面的桥梁地震易损性分析

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (22) : 245-254.

论文

李辉辉1，李立峰1,2

作者信息 +

Bridge fragility analysis based on an improved uniform design-response surface methodology

LI Huihui1 LI Lifeng1, 2

Author information +

文章历史 +

摘要

为研究传统均匀设计响应面法中设计变量多重相关性现象和变量相关性条件对地震易损性分析的影响，引入Nataf变换，结合基于样条变换的均匀设计响应面法，提出了一种基于改进均匀设计响应面的桥梁地震易损性分析方法。以一座多跨连续梁桥为例，基于OpenSees建立其动力有限元模型并进行非线性时程分析，考虑了墩柱、板式橡胶支座、铅芯橡胶支座和桥台四类构件的地震损伤，分别在考虑变量相关性前后、采用传统及改进均匀设计响应面法对算例桥梁地震易损性分析进行了比较。研究结果表明，考虑变量相关性后，改进均匀设计响应面法建立的响应面模型能更好地拟合结构功能极限状态函数；桥梁构件及系统在不同损伤状态下的损伤超越概率均有一定程度的降低；忽略变量相关性的影响、采用传统均匀设计响应面法均可能会高估桥梁结构在地震作用下的易损程度。

Abstract

The effects of multi-correlation among design variables in the traditional uniform design-response surface methodology and correlations among structural random variables on seismic fragility analysis were studied.Introducing the Nataf transformation and combining it with the uniform design-response surface methodology based on spline transformation, an alternative method for bridge seismic fragility analysis was proposed.A multi-span reinforced concrete continuous girder bridge was taken as a case-study, its finite element model was built by using the OpenSees software and a nonlinear time-history analysis was conducted.In the study, the damages of pier, lead rubber bearing (LRB), plate-type elastomeric bearing (PETB) and abutment were taken into account.Then, the traditional uniform design-response surface methodology and the improved one were applied to analyze the seismic fragility of the case-study bridge and their results were compared.It is concluded that the response surface established by the improved methodology can better fit the structure's surface limit state function.By using the improved methodology, the failure probability of bridge components and bridge system under different damage states has a certain degree of reduction.The seismic capacity of the bridge tends to be underestimated by neglecting the correlations among structural random variables and using the conventional uniform design-response surface methodology in seismic fragility analysis.

导出引用

李辉辉1，李立峰1,2. 基于改进均匀设计响应面的桥梁地震易损性分析[J]. 振动与冲击, 2018, 37(22): 245-254

LI Huihui1 LI Lifeng1, 2 . Bridge fragility analysis based on an improved uniform design-response surface methodology[J]. Journal of Vibration and Shock, 2018, 37(22): 245-254

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