粘滞阻尼结构的随机地震响应分析

Analysis of Random Seismic Responses of Viscous Damping Structure

考虑到地震动具有随机性，利用过滤白噪声地震动模型，采用虚拟激励法对粘滞阻尼结构在随机地震下进行响应分析，建立粘滞阻尼结构的状态空间方程，在状态方程中求解减震结构的响应统计值，对减震结构和非减震结构进行比较分析，得出粘滞阻尼器能将楼层位移减小28％，楼层速度减小32％～45％，层间位移减小28％．并得出使用虚拟激励法能高效快捷求出结构的随机响应的结论．

Considering the randomness of earthquake motions, and making use of the model of stationary filtered white noise process, we adopt the pseudo excitation method to analyze the responses of the viscous damping structure under random seismic excitations. The state space equation of the structure is estab- lished and response statistics are obtained. A comparison between the shock structure and the damping structure is made. It is concluded that viscous dampers can reduce the floor displacement by 28 %, the floor rate by 32% to 45~//oo ,the interlayer displacement by 28%. At the same time the pseudo-excitation method can help us to get the random responses of the structure in a valid way.