组合基础隔震系统地震反应分析

对组合基础隔震系统中叠层橡胶支座和滑板摩擦隔震支座的恢复力特点进行了研究 ,提出并分析了叠层橡胶支座的粘弹性模型和滑板摩擦隔震支座的粘刚塑性模型 ;即叠层橡胶支座采用弹性恢复力模型和粘滞阻尼恢复力模型 ;滑板摩擦隔震支座采用双线性库仑摩擦阻尼恢复力模型和粘滞阻尼恢复力模型。用提出的分析模型对振动台试验隔震房屋进行了三维非线性动力时程分析 ,并将分析结果和振动台试验结果进行了比较。结果表明所提出的分析模型不仅能有效预测上部结构的地震反应 ,而且分析和试验所得的隔震支座滞回曲线相似。

ANALYSIS OF THE SEISMIC RESPONSE OF THE COMBINED ISOLATING SYSTEM

The hysteretic characteristic of laminated rubber bearing and sliding friction bearing in the combined isolation system of foundation were studied,and then a viscoelastic model for analyzing the laminated rubber bearing and a viscous-rigid model for analyzing the sliding friction bearing were proposed.The elastic hysteresis model and the viscous damping hysteresis model were used for laminated rubber bearing;the bi-linear coulomb damping hysteresis model and the viscous damping hysteresis model were used for sliding friction isolating bearing.The 3-dimension nonlinear dynamic time history was analyzed by proposed models on isolating house on vibrating table.Results of analysis was compared with that of testing on the vibration table.it was shown that the earthquake response of superstructure could be predicted by those models,moreover,the analyzed and tested hysteretic loops are similar.