非平稳地震作用下巨型-子控制结构体系反应分析

利用复模态方法,对巨型-子控制结构体系和普通巨型框架结构进行了非平稳地震作用下的对比分析,主框架顶层的位移响应降低了95.70%,加速度响应降低了24.08%;证明这种新的结构体系对地震作用的有效控制,对结构安全性和舒适度均有明显提高.探讨了次框架的剪切刚度与耗能阻尼器的阻尼对结构地震响应的影响,当次框架与主框架的剪切刚度比大于0.15并避开0.4;耗能阻尼器与次框架的首层阻尼比为1.0～3.0,结构的地震响应可以得到进一步的控制,给出的合理范围对结构设计起到了指导性作用.

Study on Mega - Sub Controlled Systems Subjected to Non- stationary Seism Loads

Vibration-control mechanism and superiority of a new control system-mega-sub controlled systems are studied.Based on the complex mode analysis theory of radom vibration,for comparison, a megaframe without control and one with sub control are studied under the same non-stationary seism load conditions,the displacement response of mega frame coping reduces 95.70%,the acceleration response reduces 24.08%,the significant cost-effectiveness of the mega-subframe systems is demonstrated in controlling the acceleration and demonstrated responses of mega frame to seism loads, not only enhancing the safety of structure but also improving the comfort of occupants. Two factors:subsidinary frame shearing ridigity and the damp of damper effecting on the response of systems ,the rigidity ratio is more than 0.15 and avoids 0.4,and the damp ratio from 1.0 to 3.0.The response of the system is reduced.