基于Kanai-Tajimi地震模型不规则建筑AMTMD减震行为的研究

ASEISMIC BEHAVIORS OF ACTIVE MULTIPLE TUNED MASS DAMPERS FOR ASYMMETRIC BUILDINGS BASED ON KANAI-TAJIMI MODEL

基于Kanai-Tajimi(K-T)地震模型,建立了不规则建筑主动多重调谐质量阻尼器(AMTMD)系统的状态空间方程。AMTMD最优参数准则定义为:设置AMTMD不规则建筑最大位移动力放大系数的最小值的最小化。AMTMD有效性准则定义为:设置AMTMD不规则建筑最大位移动力放大系数的最小值的最小化与未设置AMTMD不规则建筑最大位移动力放大系数之比。使用定义的两个准则,通过考虑结构受控频率与地震卓越频率比(DGFR)的不同取值,研究了DGFR对AMTMD最优参数和有效性的影响。

The state space equations of an asymmetric building system with active multiple tuned mass dampers (AMTMD) are derived based on Kanai-Tajimi(K-T) model for seismic ground motion. The criterion for searching the optimal parameters of AMTMD is defined as minimization of minimum values of the maximum displacement dynamic magnification factors of the asymmetric building with AMTMD. The criterion for assessing the effectiveness of AMTMD is defined as the ratio of the minimization of minimum values of the maximum displacement dynamic magnification factors of the asymmetric building with AMTMD to the maximum displacement dynamic magnification factor of the asymmetric building without AMTMD. Considering different values of the ratio between the structural controlled frequency and the dominant ground frequencies,referred to as the dominant ground frequency ratio(DGFR), the influence of DGFR on AMTMD optimal parameters and effectiveness is studied.