计算近场地震作用下隔震结构支座破坏易损性曲线的概率凸集混合模型

用凸集模型模拟隔震结构参数的不确定性,而用随机模型模拟地震动输入的不确定性,提出了计算近场地震作用下在考虑双不确定性因素时隔震结构支座发生破坏的易损性曲线计算新方法;计算结果将给隔震支座力学参数的设计提供参考;通过计算对比可知,若不考虑结构参数不确定性将低估隔震支座破坏的地震易损性;对计算实例中基底最大位移敏感度分析发现,隔震支座的力学参数(如屈服力、屈服后刚度等)对基底最大位移影响较大,上部结构质量的影响次之,而上部结构的刚度对其影响不大;此外,本文的研究内容也为考虑结构参数和输入地震动双不确定性因素的情况下,计算各类结构地震易损性曲线提供了一种新的思路和途径。

A hybrid probabilistic and convex model for caculating the vulnerability curve of the failure of isolation bearing under near-fault earthquake ground motion

Uncertain parameters of base-isolated structure are described as convex model and uncertain earthquake ground motions are described as probabilistic model,a new method for calculating vulnerability curve of the failure of isolation bearing under near-fault earthquake ground motions is presented.The results of the calculation provide reference for the choice of the isolator's mechanical parameters;From calculation and comparison it can been seen that if the uncertainty of structural parameters aren't considered,the earthquake vulnerability of the failure of isolation bearing would been underestimated;According to the sensitivity analysis of the maximum base displacement,the mechanical parameters of the isolation bearing have great influence on the maximum base displacement followed by the mass of super-structure and the influence of the stiffness of superstructure is small.In addition,the study contents in the dissertation provide a new idea and approach to calculate the earthquake vulnerability curve of various structures,considering the uncertainty of structural parameters and earthquake ground motions simultaneously.