巨型框架多功能减振结构体系风振响应分析

巨型框架多功能减振结构体系具有调频质量减振、基础隔震和阻尼耗能减振等多种减振功能。通过频域分析 ,阐明了巨型框架多功能减振结构体系在风荷载作用下的减振原理 ,得到了主框架侧移减振系数随调谐比和次框架阻尼比的变化规律。采用简谐波合成法模拟了脉动风荷载 ,通过时域有限元分析 ,验证了频域分析的结论。研究结果表明 ,与普通的巨型框架结构体系相比 ,巨型框架多功能减振结构体系在风荷载作用下的响应显著降低 ,具有良好的减振效果。

STUDY ON WIND-INDUCED RESPONSE OF MULTIFUNCTIONAL VIBRATION-ABSORPTION MEGAFRAME STRUCTURES

Multifunctional vibration-absorption megaframe structures can dissipat e energy by multiple tuned mass dampers, base isolaters and dampers. The princip le of energy dissipation of Multifunctional vibration- absorption megaframe str u ctures is clarified by frequency domain analysis. The rules of ratio of lateral top displacement of main frame changing with the turn ratio and damping ratio of subframes are obtained. The fluctuation wind loads are simulated by harmonic sy nthetic method. The rusults of frequency domain analysis are verified by time do main finite element analysis. The result shows that, compared with normal megafr ame structures, the wind induced response of multifunctional vibration-absorpti on megaframe structures can be greatly reduced.