高层建筑非线性地震反应的半主动H_∞控制

SEMI-ACTIVE H_∞ CONTROL OF NONLINEAR SEISMIC RESPONSE FOR HIGH-RISE BUILDINGS

针对国内外学者多数集中于研究地震激励作用下结构线性反应的振动控制的现状,采用MR阻尼器作为控制装置,提出了能有效抑制强烈地震激励下高层建筑非线性反应的半主动H∞控制;通过观测楼层的加速度和半主动控制力,构建了适用于半主动控制的Kalm an-Bucy状态估计器。该方法有效地考虑了地震荷载的不确定性。对一个受控的20层基准建筑进行了非线性反应的数值仿真分析,并与其他控制策略的结果进行了对比分析。结果表明,半主动H∞控制是一种性能优良的控制策略,能有效地抑制高层建筑结构的非线性地震反应,减小强烈或罕遇地震对建筑结构的破坏。

Different from studies mostly focusing on the linear response control of civil engineering structures,a semi-active control strategy,in which the magnetorheological dampers are used as actuators,is presented for reducing nonlinear response of high-rise buildings.Based on the measured vector of floor accelerations and semi-active control forces,a Kalman-Bucy observer suitable for semi-active strategy is built to obtain the estimation of state vector.The proposed strategy takes the uncertainty effects of earthquake excitation into account.Numerical simulation is carried out for analyzing the nonlinear seismic responses of the controlled 20-story benchmark building,and the simulation results are compared to those of other control strategies.The results show that the developed semi-active strategy has good performance,can reduce the nonlinear seismic response of high-rise building efficiently and minimize the damages in the building structures caused by strong earthquakes.