地基──基础隔震结构系统的动力响应

着重讨论不同地基条件下基础隔震结构的地震响应．把地基一基础隔震结构作为一个完整系统分析，对其中的隔震结构采用了集中质量模型；视地基为置刚性基础于其上的各向同性半空间，半空间的特性则用弹簧一粘性阻尼器组合而成的Ｖｏｉｇｈｔ固体来代表；对于隔震层，针对叠层橡胶支座的阻尼特性采用了与试验结果更为吻合的滞变阻尼模型．在分析中考虑了地震时基础可能产生的水平振动和摇摆，但略去其耦合作用．分析表明：地基性质对基础隔震结构的地震响应有影响，但远比对抗震结构的影响小．

Earthquake Responses of Foundation-Base-IsolatedStructure System

This article analyses the earthquake responses of foundation-base-isolated structure system under the different foundation conditions. In the analysis, the base-isolated structure ispresumed to be supported.on the surface of homogeneous elastic half space and idealized as amulti-mass system. The characters of the half space are represented as Voight solid includinglinear springs and viscous dampers. The damping characters of lead-laminated rubber isolater are simulated with hysteretic damper model in accordance with experimental results.The horizontal and rocking motions of foundation in earthquake are considered, but the smallcoupling between the horizontal and rocking motions is neglected. The results show that thecharacters of the foundation have effect on the earthquake response of the base--isolatedstructures, but the effect is much less than that in conventional structures.