基于非对称模型的碟簧隔震单自由度体系地震响应

基于碟簧竖向隔震（DSVI）支座的非对称受力特征，提出非对称恢复力模型，并利用试验结果对该恢复力模型进行验证；基于该非对称恢复力模型，建立碟簧竖向隔震单自由度（DSVI-SDOF）体系的非线性时程分析程序. 在此基础上，对典型DSVI-SDOF体系进行非线性动力时程分析，研究非对称恢复力模型对其地震响应分析结果的影响. 研究结果表明，非对称恢复力模型能够准确表征DSVI支座的力学行为，从而使得非线性时程分析程序能够较为准确地模拟DSVI-SDOF体系的地震响应. 随着地震动峰值加速度的增加，DSVI-SDOF体系的峰值加速度、峰值地震力的隔震率先增大后减小，当地震动峰值加速度为400 cm/s²时，DSVI-SDOF体系的隔震效果达到最优，峰值加速度和峰值地震力的隔震率均在20%~50%.

Seismic responses of disc spring isolated-single degree of freedom system based on asymmetric model

An asymmetry restoring force model was proposed based on the asymmetric force characteristics of disc spring vertical isolation (DSVI) bearing, and it was validated by the test results. Then, based on the asymmetric restoring force model, nonlinear time-history analysis program for the disc spring vertical isolation-single degree of freedom (DSVI-SDOF) system was established. Furthermore, the nonlinear dynamic time history analysis of a typical DSVI-SDOF system was carried out to study influence of the asymmetric restoring force model on the structural seismic responses. Results show that the asymmetric model can accurately characterize the mechanical behavior of the DSVI bearing; hence, the seismic responses of the DSVI-SDOF system can be simulated accurately by the nonlinear time-history analysis program. With increase of peak ground acceleration, the isolation ratios of maximum acceleration and maximum seismic force of the DSVI-SDOF system increase first and then decrease. When peak ground acceleration is 400 cm/s², the isolation effect of the DSVI-SDOF system is optimal, and the isolation ratios of both maximum accelerations and maximum forces are between 20%?50%.