钢筋混凝土巨型框架多功能减振结构的调频减振原理

研究了钢筋混凝土巨型框架多功能减振结构的减振原理 ,并对影响减振效果的因素进行了分析和研究。分析表明 ,隔震次框架的位置越靠近上部对主框架的减振效果越好 ,并且最优调谐比越小 ;随隔震层阻尼比的增大 ,主框架的减振系数减小 ,但隔震层阻尼比过大对主框架的减振效果不利 ;确定隔震次框架的最优频率变化范围是解决隔震次框架频率优化的合理方法。

STRUCTURE-CONTROL MECHANISM OF MULTIFUNCTIONAL VIBRATION-ABSORPTION OF RC MEGAFRAME STRUCTURES

The structure control mechanism of the multifunctional vibration absorption of RC megaframe structure and the factors influencing the vibration absorption efficiency are studied in this paper.The analytical results show that the upper the place of the isolated minor frame,the better the vibration absorption efficiencies,and the smaller the optimum frequency ratio.With increasing damping ratio of the base isolators,the vibration absorption coefficient of the major frame decreases;however,after the damping ratio go beyond the limit,the vibration absorption coefficient of the major frame increase little.It is a reasonable method to solve the question of the natural frequencies optimization by determining the range of the natural frequency of each isolated minor frame.