多自由度电流变阻尼隔震结构的数值分析

Numerical Analysis of Multi-degree of Freedom Isolation Structures with ER Dampers

采用电流变智能隔震装置对多自由度结构进行了基础隔震控制.给出了电流变智能隔震装置的基本构造,提出了隔震装置的恢复力模型.根据摩擦结构运动机理,分析了隔震结构的动力特性,给出了隔震结构各阶段的运动方程及其判别准则,编制了结构非线性动力分析程序.对多自由度隔震结构进行了动力时程分析,分别采用3种恢复力模型的隔震装置对结构进行控制.结果表明,采用电流变智能隔震装置对结构进行控制可以有效地限制隔震层的位移.此外,拟限位型隔震装置还可以有效降低结构加速度,拟摩擦装置对结构加速度有所增加.

The base isolation control analysis of multi-degree of freedom structures（MDOFs） with electrorheological（ER） smart device was carried out.The restoring force model of ER damper has been developed after designing the details of the device.The dynamic characteristics of isolated system were analyzed on the basis of the friction mechanism.Then,the equations and criteria were given for each vibration stage of the isolated system and the corresponding nonlinear analysis program was made.The dynamic time-history analysis was conducted for two MDOFs isolated with ER devices of three different hysteretic rules.The analysis indicated that good control effect could be achieved by reducing the displacement of the isolated system.And the structural acceleration could be reduced significantly with the displacement-limited ER isolator.The acceleration response of structure with pseudo-friction type isolator might be enlarged.