（中国航空规划设计研究总院有限公司， 北京 100120）

［摘要］对于基础隔震结构，隔震层的水平刚度和阻尼比是其减震效率的关键因素。以成都博物馆为工程实例，以试验得到橡胶隔震支座的力学性能参数为基础，建立隔震与非隔震结构有限元计算模型。在多遇地震作用工况下和罕遇地震作用工况下，隔震层水平刚度在0-25～2-0倍实际工程隔震层水平刚度范围内，阻尼比在5%～30%范围内，对比分析结构层加速度、总剪力及总倾覆力矩的减震效率变化趋势，以及减震效率与隔震层水平刚度和阻尼比之间的对应关系。基于对比分析结果，对采用叠层橡胶支座的基础隔震结构，提出了不同隔震目标下隔震层水平刚度和阻尼比的建议取值范围。

［关键词］基础隔震； 隔震层； 减震效率； 水平刚度； 阻尼比

中图分类号：TU352-1+2文献标识码：A文章编号：1002-848X(2019)11-0123-05

Study on design of the isolation layer′s performance of base isolation structure

Zhang Mansheng, Zhang Guojun, Ma Botao, Wang Mingzhu, Zhang Ling, Liu Xingang, Ge Jiaqi

（China Aviation Planning and Design Institute (Group) Co., Ltd., Beijing 100120, China）

Abstract:For the base isolation structure, the horizontal stiffness and damping ratio of the isolation layer are the crucial factors for its damping efficiency. Taking Chengdu Museum as an example, a finite element model of non-isolated structure was established, along with a finite element model of isolated structure based on the mechanical properties of the rubber isolators. Under the conditions  of frequently and rarely occurred earthquakes, the horizontal stiffness of the isolation layer is 0-25～2-0 times of that of the actual engineering isolation layer, and the damping ratio is in the range of 5%～30%. The trends of the  seismic reduction ratio  of the structural layer acceleration, the total shear force and the total overturning bending moment have been analyzed. The  seismic reduction ratio  have been corresponded to the horizontal stiffness and damping ratio of the isolation layer. Based on the results of comparison, the recommended values of the horizontal stiffness and damping ratio of the isolation layer are proposed for the base isolation structure composed of laminated rubber bearing under different damping targets.

Keywords:base isolation; isolation layer; seismic reduction ratio; horizontal stiffness; damping ratio

*北京市科委科技服务业专项（Z141110001714003），中国航空规划建设发展有限公司技术进步研发课题（技14研17）。

通讯作者：马伯涛，博士，高级工程师，Email: mabotao@avic-capdi.com。