基于响应面法的隔震连续梁桥地震易损性分析

Seismic fragility analysis of isolated continuous girder bridge using response surface method

地震易损性分析是地震灾害分析的重要内容,可以比较全面地评价结构的抗震性能,因此,快速有效地得到结构的地震易损性非常重要。本研究以一隔震连续梁桥为对象,同时考虑结构材料和地震动的不确定性,以中心复合设计法建立试样样本对,基于OpenSees建模并对样本对进行非线性时程分析,建立了桥梁各构件响应值的响应面模型,并采用拉丁超立方抽样计算得到结构的易损性曲线。分析结果表明:所建立响应面模型精度较高、结果可靠,减小了复杂有限元计算的工作量,有效地提高了地震易损性分析的时效性,具有一定的工程应用价值。

The seismic fragility analysis is significant for the seismic hazard analysis, which can be used to evaluate the structure＇ s seismic performance comprehensively. Therefore, it is very important fectively. The study takes an isolated continuous girder bridge as the object, taking to get the seismic fragility ef- the uncertainties of structural material and ground motion into account. The sample pairs are obtained by the central composite design method. The nonlinear time history analysis for the sample pairs are conducted based on OpenSees models. Then, the re- sponse surface model of each bridge component＇ s response value can be established through the numerical method, and on the basis of the models, the structural fragility curve can be obtained using the Latin Hypercube sampling simulation. The example shows that response surface models are accurate and reliable, which efforts of the complex finite calculation and enhance the efficiency of the fragility analysis. Th valuable in the engineering applications. can reduce the work us it is comparatively