大调谐质量比减振结构中巨梁层竖向地震响应分析

ANALYSES OF VERTICAL EARTHQUAKE RESPONSES OF THE MEGA-BEAM FLOOR IN THE VIBRATION-ABSORPTION STRUCTURE WITH LARGE TUNED MASS RATIO

基于随机振动分析方法对大调谐质量比减振结构及普通巨型框架结构中巨梁层竖向地震响应问题进行探讨,并从实际构造的角度为解决大跨度巨梁层竖向动力响应过大问题提供设计建议。研究结果表明:巨梁层上最大竖向地震响应分布于中段附近;巨梁层于建筑上的位置越高,其竖向地震响应越大;相比其他巨梁层,大跨度巨梁层竖向地震响应同比增大;在大跨度巨梁层上设置子框架可对该巨梁层竖向地震响应起到抑制作用。

Some problems of the vertical earthquake responses of the mega-beam floor in both the vibration-absorption structure with large tuned mass ratio and the common mega frame are discussed based on random vibration theory,and some design advices from practical conformation are provided for resolving the excessive dynamical responses of the large-span mega-beam floor.The results indicate： the maximal vertical earthquake response of the mega-beam floor is located around its middle part;the vertical earthquake response of the mega-beam floor is increasing with its location in the heightened structure;the vertical earthquake responses of the large-span mega-beam floor with a sub-frame,are depressed.