磁流变阻尼器对建筑结构地震响应半主动控制分析

研究目的:地震时建筑结构的大幅震动已为世人关注。国外学者将磁流变(MR)阻尼器应用到土木结构震动控制上,效果较好。为扩大其在实际工程中的应用,进一步对磁流变阻尼器对建筑结构地震响应进行了理论分析和试验。研究方法:本文首先通过磁流变阻尼器的构件参数(如:活塞的有效长度、缸体的内径、活塞直径、流体的粘度系数等)、输入电流及阻尼器活塞相对于缸体简谐运动频率的改变,分析了各参数对阻尼特性的影响,这将为设计阻尼特性较好的磁流变阻尼器提供理论依据。然后采用了磁流变(MR)阻尼器的修正Bouc-Wen模型及剪切型最优控制(Clipped-Optimal Control)算法对建筑结构地震响应进行了半主动控制分析研究,并且与结构被动控制的效果进行了对比。研究结论:在EI-centro地震激励作用下,被动控制和半主动控制对结构地震响应的水平位移与速度产生了不同的控制效果;对结构的位移及速度的控制效果,MR半主动控制均明显地优于被动控制。

Analyses of Semi-active Control of Earthquake Response to Building Structure by Magneto-rheological Damper

Research purposes: People have paid attention to the large vibration of building structure during earthquake.Magneto-rheological dampers have been applied in control of the vibration of civil structure in foreign countries with a perfect achievement.The further theoretical analyses and tests are done for the earthquake response of building structure by magnet-rheological damper for the purpose of widening the application of magnet-rheological damper in construction.Research methods:Through changing the composite parameters of magneto-rheological damper(such as the effective length of piston,inner diameter of cylinder and fluid viscosity),input current and frequency of simple harmonic motion of magneto-rheological damper against cylinder,the analyses are made for the parameters of influencing magneto-rheological damper for providing the theoretical basis for better design of magneto-rheological damper.Then the analytical researches are done on the semi-active control of earthquake response to building structure with the modified Bouc-Wen Model of magneto-rheological damper and Clipped-Optimal Control Method,and the results of semi-active control are compared with the results of semi-passive control of structure.Research conclusions:The compared result shows there are different control effects on horizontal displacement and velocity of structure under the effects of EI-centro earthquake and the effects of semi-active control is better than that of passive control in control of horizontal displacement and velocity.