设置粘滞阻尼器的基础隔震结构地震响应分析

SEISMIC RESPONSE ANALYSIS OF BASE-ISOLATED STRUCTURE WITH VISCOUS DAMPER

基础隔震结构中隔震支座的的恢复力-变形行为采用Bouc-wen模型模拟,建立运动方程进行时程分析,利用MATLAB自编程序实现数值分析,对比了相同隔震层控制效果的前提下设置线性阻尼器与非线性阻尼器对结构响应的影响,并对体系进行了能量分析。研究表明,非线性阻尼器能以较小的阻尼力控制隔震层位移,而线性阻尼器更有利于抑制上部结构的地震响应,但线性阻尼器输出力要求大,制作成本也高,实际应用中可优先考虑线性阻尼器,合理选择阻尼系数以获得较低成本及良好的控制效果,另外从能量角度分析得阻尼器的耗能机理。

The restoring force-deformation behavior of isolation bearing in base-isolated structure was simulated by Bouc-wen model, and the equation of motion was established for time-history analysis. The MATLAB programming was written for numerical analysis. With the same control effectiveness of isolation layer, the influence of linear damper and nonlinear damper on the structure response were compared. The energy response of system was analyzed. The results show that the nonlinear dampers can control the displacement of the isolation layer with lower damping force, while the linear dampers are more effective in suppressing the seismic response of the superstructure; However, the linear dampers require large output force and higher production cost; In practical application, linear dampers can be prioritized and the damping coefficient can be reasonably selected to obtain lower damper cost and good control effectiveness; The energy dissipation of damper is the primary cause for the displacement reduction of the isolation layer.