随机地震激励下相邻隔震结构被动控制研究

利用隔震结构和非隔震结构间的相互作用来减小地震作用下的结构响应,考虑地震激励的随机性,基于Clough-Penzien谱模型,推导了相邻结构随机响应的拓展状态方程,采用两种优化控制目标,分析得到了相邻隔震结构体系间连接控制装置的控制参数与结构随机响应的关系及其对控制效果的影响,并分别从地震响应时程和振动累计能量时程角度研究了相应地多自由度相邻隔震结构复合被动控制体系,在不同优化准则及不同控制方案下,结构体系的减震控制效果。研究结果表明,相邻隔震结构复合被动控制体系,可以获得较好的减震控制效果,阻尼系数在减震控制中起主要作用,但存在最优取值,并不是越大越好;采用以左、右子结构振动总能量最小为优化准则,在顶层+中间层安装控制装置的控制方案,可以有效地减小相邻结构的地震响应,得到的控制效果较好。

Passive control for adjacent isolated structure under random seismic excitation

A control method for reducing structural response under seismic excitation was proposed by using the interaction between isolated structure and non-isolated structure.In this method,considering the randomness of seismic excitation,the extended state equation of random response of adjacent structures was derived based on Clough-Penzien spectral model.Then,using two optimization control objective,both the relationship between the control parameters and the structure random response of the adjacent isolation structures and its influence on the control effect were analyzed and obtained.Finally,under different optimization criteria and different control schemes,based on the seismic response time history and the accumulated vibration energy time history,the isolation control effect of the composite passive control system of adjacent isolated structures with corresponding multiple degrees of freedom is studied.The results show that the composite passive control system of adjacent isolated structures can achieve better shock absorption control effect,and the damping coefficient plays a major role in the shock absorption control,but there is an optimal value,and the bigger is not the better.When the minimum vibration energy of left and right substructures is adopted as the optimization criterion,The seismic response of adjacent structures can be effectively reduced and can get a good effect for control by adopting the installs control devices in the top and middle floors.