基于随机响应的隔震体系简化模型参数计算

为简化计算,将隔震结构等效为双自由度体系简化模型.论述了利用结构随机响应评判隔震简化模型参数几种不同取值方式的一般原则,建立了计算简化体系等效参数的多目标优化参数识别模型.取简化结构与原结构主要随机响应的方差作为目标函数,用结构基本周期等效的条件确定简化体系优化初值,并用复合形法进行交互式优化运算.文末采用一个实际隔震工程作为算例,显示了采用结构随机响应进行隔震结构简化模型等效参数识别的优越性.

Parametric calculation of isolated structures using simplified models based on random vibration

The isolated structure was expressed with an equivalent 2-DOF system.The general principle of evaluating the performance of different approaches to calculating equivalent parameters of simplified isolated model was discussed,and a mathematical model for parameter identification of equivalent system was established using multi-objective optimization technique.The squared deviation of several main random responses of the simplified system and the original system as well was taken as the objective function of minimization,the initial value was determined based on the equivalence of fundamental period of the structures,and the optimization problem was solved using interactive complex method.An actual isolated structure was taken as its numerical example,and the advantage of identification of equivalent parameters for simplified isolated model using random responses is exhibited.