隔震支座主要参数对基础隔震结构双向地震响应的影响

为研究不同场地类型隔震支座主要参数（等效水平刚度Kf、屈服前刚度K1和屈服力Qd）对基础隔震结构双向地震响应的影响,设计Kf、K1或Qd不同的18栋基础隔震结构,基于SAP2000软件,对各隔震结构分别在不同场地类型的4组地震动作用下的双向地震响应进行分析.结果表明,隔震支座参数对不同场地类型的基础隔震结构在双向地震作用下的加速度最大值和基底剪力最大值均有显著影响,但其对基础隔震结构隔震层位移最大值的影响需根据场地类型具体考虑;在Ⅰ、Ⅱ、Ⅲ类场地上,随着Kf、K1和Qd增大,基础隔震结构的加速度最大值和基底剪力最大值均呈明显的上升趋势,但对隔震层位移最大值的变化影响较小;在Ⅳ类场地上,不同隔震支座参数对隔震层位移最大值的影响较大,且有明显的规律性,即随着Kf、K1、Qd的增大,隔震层的位移峰值迅速减小,最大减幅达80％以上.

Effect of Parameters of Lead Rubber Bearings on Bilateral Seismic Response of Base-Isolated Structures

In order to investigate the influence of three main performance parameters of isolator, i. e. equivalent horizontal stiffness Ks, pre-yield stiffness K1 and yield force Qd, on the bilateral seismic response of base-isolated structures with different site condition, eighteen base-isolated structures different between Kf,K1 or Qd were designed. Based on SAP2000, the bilateral seismic responses of each isolated structure excited by four seismic waves of different site types are analyzed respectively. It is found that, the acceleration response and the base shear response of base isolated buildings under bilateral seismic excitation are influenced remarkably by the aforementioned isolator parameters, and the effect of the parameters on the isolation layer＇s displacement response varies from different site conditions. Under the condition of Ⅰ、Ⅱ、Ⅲsite classified in Chinese seismic code, both the top floor＇s maximum acceleration and the maximum base shear of base isolated structure show an obvious increase trend with the increasing of iKf ,K1 and Qd, However, the isolation layer＇s maximum deformation does not change evidently. Under the condition of Ⅳ sites, the effect of isolator parameters on the isolation layer＇s maximum deformation is significant and represents obvious regularity. As Kf,K1 and Qd increases, the peak deformation value of isolation layer decreases sharply with the biggest decline of above 80 %.