高架桥地震响应的半主动控制研究

Semi-active control on seismic responses of elevated highway bridges

文章根据高架桥的结构特点,将整个结构简化为多自由度(MDOF)体系,采用磁流变(MR)阻尼器中修正的Bouc-Wen模型和剪切型最优控制(clipped-optimal control)算法对高架桥的地震响应进行了半主动控制研究;同时将MR阻尼器半主动控制与结构被动控制和主动控制的效果进行了对比研究;使用EI-Centro波、Taft波和天津波3种地震波对高架桥-MR阻尼器半主动控制系统进行了数值模拟计算。数值结果表明:基于MR阻尼器的半主动控制能够有效地减小高架桥的水平地震位移,其控制效果明显优于被动控制,且接近于主动控制。

Based on the characteristics of elevated highway bridges,a simplified model of multi-degree-of-freedom（MDOF） is introduced in this paper.The modified Bouc-Wen model for magneto-rheological（MR） dampers and the clipped-optimal control strategy are selected to make MR damper based semi-active control for elevated highway bridges under earthquakes.The effect of semi-active control is compared with those of passive control and active control for an elevated highway bridge.The MR damper based semi-active control system subjected to Centro,Taft and Tianjin waves is simulated respectively.The numerical simulation results demonstrate that in terms of the mitigation of horizontal displacement of elevated highway bridges,MR damper based semi-active control is superior to passive control,and approaches to active control.