多维地震激励下空间结构MR阻尼器半主动控制

基于LQR算法提出了大跨平板网架结构的空间最优控制力的计算方法，并应用磁流变（MR）阻尼器对大跨平板网架结构的多维地震反应进行振动控制．分别采用半主动控制和被动控制策略，数值仿真了一空间网架结构在三维天津波和El-Centro波激励下的受控地震反应，并对各种控制策略的控制效果进行了比较分析．结果表明，应用MR阻尼器能使大跨平板网架结构的地震反应得到有效控制，同一种控制策略对不同地震激励的控制效果不同；采用半主动控制策略时，结构水平位移和加速度幅值的控制效果可达66．4％和47．5％，其均方根值的控制效果可达80．4％和72．9％；采用被动控制策略时，结构水平位移幅值及其均方值的控制效果也可达到23．7％和33．8％．因此所提出的确定空间最优控制力的方法是有效的．

Semi-Active Control on Spatial Structures Using MR Damper Under Multi-Dimensional Earthquake Excitations

Based on the linear quadratic regulator(LQR) algorithm,a method to calculate the spatial optimal control forces of long-span lattice structures was proposed, and with the magnetorheological(MR) damper,the vibration control on the multi-dimensional seismic responses of the long-span lattice structures was performed.By applying semi-active and passive control strategies,the controlled seismic responses of a spatial lattice structure under multi-dimensional Tianjin and El-Centro earthquake excitations were numerically simulated,and the control effects in different control strategies were compared.The results showed that the seismic responses of the long-span lattice structure could be controlled effectively by applying the MR damper,and the control effect varied greatly with different earthquake excitations in the same control strategy.When the semi-active control strategy was applied,the peak lateral displacement and acceleration of the structure could be reduced by 66.40/0 and 47.50/0 respectively,and root mean square values reduced by 80.40/0 and 72.90/0 respectively.When the passive control strategy was applied,the peak lateral displacement and its root mean square value could also be reduced by 23.70/0 and 33.80/0.It can be concluded that the proposed method is feasible.