并联基础隔震体系地震反应特征与隔震层参数的优选

Seismic Response Characteristics and Optimal Parameters in R-FBI System

本文在大量工程算例仿真分析的基础上,较为系统地研究了典型并联基础隔震结构地震反应的一般特征,探讨了并联基础隔震体系隔震层参数的合理选择问题。研究表明,在一定限度内,增加隔震层回复刚度几乎不会改变上部结构的最大层间剪力,但对隔震层最大滑移位移和残留位移却有非常显著的限制作用,隔震层回复刚度的参与不改变结构地震反应的频谱特性。为限制隔震层位移,在保证不增大上部结构最大层间剪力的前提下,应尽量增加隔震层回复刚度;隔震层屈服剪力的取值则需兼顾隔震效果与隔震层滑移位移。

Based on the analysis of engineering cases, the seismic response characteristics are studied systemically and the optimal base-layer parameters of a typical R-FBI(resilient-friction base isolation) structure are discussed. The results indicate that increasing resilient stiffness of base layer within an certain limit nearly won't change the maximum story shearing force and frequency contents in structures seismic responses, it is also found that small resilient stiffness can be efficient in controlling the maximum sliding displacements and permanent displacements. The paper suggests that for the sake of controlling the sliding displacement in base layers, the resilient stiffness should be increased as great as it could be, by guaranteeing no increasing the maximum story shearing force as prerequisite. As to the choosing of the yield-shearing force of base layers, it should balance isolated effects of structures and sliding displacements.