设置新型自复位阻尼器的隔震结构动力响应控制效果分析

Analysis of Dynamic Response Control Effect for the Isolation Structure with Innovative Self-centering Dampers

针对常规黏滞阻尼器不具备自复位能力的问题,研发新型自复位阻尼器,该阻尼器主要由导杆、密封外筒和碟形弹簧组成。通过构造设计,可使阻尼器受拉和受压时碟形弹簧均处于压缩状态,从而为阻尼器提供弹性恢复力。根据阻尼器工作原理与力学特性建立阻尼器理论滞回模型,采用有限元分析软件SAP2000建立无控结构、常规隔震结构和自复位隔震结构模型,分别进行动力响应分析。研究结果表明,新型自复位阻尼器不影响结构自振周期,可使结构加速度和位移得到有效控制;对于自振周期与地震动卓越周期相近的结构,新型自复位阻尼器动力响应控制效果优于常规黏滞阻尼器;数值模拟计算得到的新型自复位阻尼器滞回曲线饱满,呈双线性特征,与理论滞回模型相符。

Aiming at the problem that conventional viscous dampers do not have self-centering capability,an innovative self-centering damper,which is composed of a guide rod,a sealed outer cylinder,disc springs,was proposed in this paper.Through structural design,whether the damper is under tension and compression,the disc springs were all in a compressed state to provide elastic restoring force.According to the working principle and mechanical characteristics of dampers,a theoretical hysteresis model was established.The particle system models of uncontrolled structure,isolation structure with conventional viscous dampers,and self-centering isolation structure with self-centering dampers were established using the finite element analysis software SAP2000,and the dynamic response analysis of the structures under different seismic waves was conducted.The research results show that the innovative self-centering damper has no effect on the natural vibration period of the structure,but the acceleration response and displacement response are significantly reduced.For structures whose natural vibration period is similar to the predominant period of ground motion,the dynamic response control effect of the innovative self-centering damper is better than that of the conventional viscous damper.The hysteresis curve of the innovative self-centering damper obtained by numerical simulation is full and bilinear,which is consistent with the theoretical hysteresis model.