框架结构基础隔震方案的选择

The Solution to Seismic Isolation of Frame Structure

某框架结构商场设计采用基础隔震,拟选用普通橡胶支座或铅芯橡胶支座,运用SAP2000有限元分析软件对两种隔震方案输入EI-Centro波进行非线性时程分析。结果表明,采用普通层叠橡胶支座的方案结构在前3个振型中增加的自振周期高于铅芯橡胶支座方案,且由地震引起各楼层的加速度略小于铅芯橡胶支座方案;采用铅芯橡胶支座方案各楼层的层间最大位移略小于普通层叠橡胶支座方案。综合考虑隔震效果、造价和施工等因素,该工程选用普通层叠橡胶支座方案更为合适。

the base isolation of frame structure design of a shopping mall planned to adopt ordinary rubber bearing or lead rubber bearing, and had a non-linear time history analysis on these two solutions for inputting EI-Centro wave by SAP2000 software of finite element analysis. The results showed that the structure of laminated ordinary rubber bearings enjoyed higher increased natural vibration period in the front three vibration modes than that of the solution of lead rubber bearing; besides, the accelerated speed caused by earthquake on each floor was slightly less than that of the lead rubber bearing. Therefore, it is more feasible to adopt the laminated ordinary rubber bearings after comprehensively taken seismic isolation effect, costs, construction and other factors into consideration.