STMD对高层建筑地震响应的控制

为了控制高层建筑的地震响应,消除控制机构驱动时产生的“时滞”现象,提出了由MR阻尼器构成的半主动控制系统STMD。根据MR流体剪切屈服强度与磁场强度同向变化的磁流变效应,通过外加磁场的变化来改变MR阻尼器的阻尼力,以实现对ITMD控制力的调节。根据瞬时最优控制的原则,采用了基于Hrovat控制律和“开关”控制律的改进的半主动控制策略,对MR阻尼器的参数进行调节。对一栋8层框架结构进行仿真分析,计算结果表明,STMD能够有效地减小高层建筑的地震响应。

STMD CONTROL FOR SEISMIC RESPONSE OF TALL BUILDING

In order to control the seismic response of the tall building and eliminate the “time lag” phenomenon by actuation of the control mechanism, intelligent TMD is proposed which consists of MR dampers. The change of yield stress of MR fluids is in the same way of magnetic field. So the controlling force of the intelligent TMD can be adjusted by changing magnetic field. According to instantaneouw optimum control principle, we use the improved semi-active control strategy which derived from the Hrovat and “on-off” control strategy to analyse the parameters of the MR dampers. An eight storied frame structure is analysed. From the numerical analysis, we can see the dvice could diminish the seismic response of a tall structure.