主动调谐质量阻尼器对不规则建筑的减震行为研究

EARTHQUAKE REDUCTION BEHAVIORS OF ACTIVE TUNED MASS DAMPERS FOR AN ASYMMETRIC BUILDING

研究了不规则建筑主动调谐质量阻尼器(ATMD)减震的行为。基于建立的地震地面运动模型下不规则建筑-ATMD系统的状态空间方程,定义ATMD的最优参数准则为:设置ATMD不规则建筑的最大平动和扭转角位移动力放大系数最小值的最小化。评价ATMD有效性的准则定义为:设置ATMD不规则建筑的最大位移动力放大系数最小值的最小化与未设置ATMD不规则建筑的最大位移动力放大系数之比。使用定义的准则,研究了不规则建筑的标准化偏心系数(NER),扭转对侧向频率比(TTFR)及地震卓越频率(DGF)对ATMD控制不规则建筑位移响应时的最优参数和有效性的影响。

The main objective here is to investigate the behaviors of active tuned mass dampers(ATMD) for an asymmetric building under earthquake.Based on the space-state equation of the asymmetric building with ATMD,the criterion for searching the optimum parameters of ATMD then is defined as the minimization of the minimum values of the maximum displacement dynamic magnification factors of the asymmetric building with ATMD.The criterion for assessing the effectiveness of the ATMD is the ratio of the minimization of the minimum values of the maximum displacement dynamic magnification factors of the asymmetric building with the ATMD to the maximum displacement dynamic magnification factors of the asymmetric building without ATMD,using the optimum parameters obtained in reducing the displacment responses of the asymmetric building.Employing the above-defined criteria,the parametric studies then are carried out to find the influences of the normalized eccentricity ratio(NER),the torsional to translational frequency ratio(TTFR) of the asymmetric building,and the dominant ground frequencies(DGF) on the optimum parameters and effectiveness of the ATMD.