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基于智能阻尼器的大跨度斜拉桥多支承激励地震振动控制
引用本文:代泽兵,黄金枝,王红霞.基于智能阻尼器的大跨度斜拉桥多支承激励地震振动控制[J].振动与冲击,2005,24(2):66-70.
作者姓名:代泽兵  黄金枝  王红霞
作者单位:上海交通大学建筑工程与力学学院,上海,200030
摘    要:以磁流变阻尼器作为控制装置,采用Clipped-Optimal控制算法,分析Benchmark斜拉桥在受到多点地震激励下的半主动控制效果;分析了同一主动控制系统在控制斜拉桥分别受到一致激励和多点激励情况下的控制效果,并与半主动控制效果进行了比较。由于磁流变液阻尼器为可控制耗能装置,并不增加受控体系的机械能,在本质上可以保证控制系统的稳定性。数值分析表明:该半主动控制策略可以取得与主动控制相当的控制效果,甚至在某些方面还超过主动控制系统,因此,磁流变阻尼器可以有效地控制受到多点激励的大跨度斜拉桥地震振动。

关 键 词:斜拉桥  多点激励  磁流变阻尼器  半主动控制
修稿时间:2003年5月14日

Semi-active Control of a Cable-stayed Bridge under Multiple-supports Excitations
Dai Zebing,Huang Jinzhi,Wang Hongxia.Semi-active Control of a Cable-stayed Bridge under Multiple-supports Excitations[J].Journal of Vibration and Shock,2005,24(2):66-70.
Authors:Dai Zebing  Huang Jinzhi  Wang Hongxia
Abstract:A semi-active strategy for seismic protection of a benchmark cable-stayed bridge in consideration of multiple-supports excitations is presented. In this control strategy, MR dampers are proposed as control devices and a clipped-optimal control algorithm is employed. An active control strategy, shown in previous researches, which is of good performance in the control of benchmark bridge when uniform earthquake motion is assumed, is also used in this study to control the vibration of benchmark bridge in consideration of multiple-supports excitations, and its performance is compared to that of the presented control strategy. Becaues the MR fluid damper is a controllable energy-dissipation device that cannot add mechanical energy to the structural system, the proposed control strategy is guaranteed to be fail-safe in that bounded-input, bounded-output stability of the controlled structure. The numerical results demonstrate that the performance of the presented control design is nearly the same as that of the active control system and the MR dampers can effectively be used to control seismically excited cable-stayed bridges with multiple-supports excitations.
Keywords:cable-stayed bridge  multiple-supports excitation  MR damping  semi-active control
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