不同频率影响下结构减振效果分析

Analysis of response reduction effect of a structure under earthquake acceleration excitations with different frequencies

利用MR阻尼器进行结构振动控制已得到广泛应用,并在时程分析中证明了其良好的减振效果。但不同频率地震波输入将对建筑物减振效果产生怎样的影响,减振效果和结构物本身自振频率是怎样的关系,这些是以往的时程分析所不能解决的。从这些问题出发,通过对一在底层安装了一个磁流变阻尼器的十二层结构在不同的地震波滤波工况下减振效果进行分析,得出不同频率输入和减振效果的关系。

Structure installed with MR damper to control its vibration is widely applied, and its good control effect is proved in time-history analysis. But in the analysis, influence of different frequency input on control effect,and relation between the control effect and natural vibration frequency of the structure can't be solved. In this paper the response of a twelve-story frame structure installed with one MR damper at the bottom floor under four different earthquake acceleration excitations is analyzed,and relation between the vibration reduction effect and the inputing earthquakes with different frequencies is obtained from the results.