单自由度结构的磁流变阻尼顶层隔振

提出了应用磁流变阻尼装置的顶层隔振控制方法．首先，对小质量比TMD的控制理论进行了深入研究，将最优TMD参数的计算公式推广到大质量比范围．以大质量比TMD控制的减振机理为基础，对顶层隔振结构的动力特性进行了研究，对参数影响进行了分析，建立了合理的顶层隔振结构体系；其次，引入磁流变阻尼器对顶层隔振结构的隔振层进行控制，避免TMD控制范围较窄和隔振层变形过大等弱点；最后，对单自由度结构进行了顶层隔振控制，理论分析结果证明：以大质量比TMD理论为基础的顶层隔振控制方法是有效的，结合了磁流变阻尼器的控制后可以避免这种方法的一些弱点，在不增加结构自重的前提下，能够保证结构良好的控制效果，隔振层的位移和结构层的加速度都得到较好的控制，控制效果达到30％左右，以磁流变阻尼器半主动控制效果最好。

Roof Isolation of SDOF Structure with MR Damper

Roof isolated structure with MR damper is put forward.Firstly,control theories of small mass ratio are studied thoroughly.The optimal parameters formulas of the TMD system are extend to big mass ratio range.The foundation of the program is the theories put forward by Sadek in 1997.Based on the control mechanism of big mass ratio TMD system,the dynamic characteristics of roof isolated structure are studied.The main parameters effects are gain and the reasonable system of roof isolated structure is set up.Secondly,isolated floor of the roof isolated system is controlled by MR dampers to avoid the shortcoming that frequency range of the TMD control is very narrow and the displacement responses of the isolated floor are very large.Passive off control,passive on control and semi-active control of MR dampers are adopted to improve the effect respectively.The controlled effects of the MR dampers and the optimal TMD system are compared.Finally,SDOF roof isolated structure with MR dampers is analyzed adopted time-history analysis method under El Centro earthquake records.The results show that:the scheme of roof isolated system with MR dampers,based on the big mass ratio TMD theories,is efficiency.MR dampers in isolated floor can avoid some weakness of the roof isolated method.The displacement and acceleration responses of the original structure and the isolated floor are controlled preferably on the premise of that the whole mass of the original structure is invariable.Under the action both of the roof isolated system and the MR dampers,displacement and acceleration responses of the system are decreased 30 percent approximately.The effects of the semi-active control with MR dampers are excellent generally.