摘要
黏滞阻尼伸臂桁架是针对核心筒-伸臂桁架结构将黏滞阻尼器竖向布置于伸臂桁架端部的一种消能减震技术,对位于高烈度抗震设防区的超高层框架-核心筒结构,采用该技术不仅可以有效地降低地震作用,还可以避免传统刚性伸臂桁架所带来的不利影响。为研究黏滞阻尼伸臂在超高层结构中的减震规律,对设置黏滞阻尼伸臂的超高层框架-核心筒结构进行减震作用分析,同时研究伸臂桁架刚度以及阻尼器参数对减震效果的影响。结果表明:黏滞阻尼伸臂具有附加阻尼和等效动刚度双重减震作用;综合考虑减震效果和经济性,伸臂桁架存在最优刚度;阻尼指数越小,减震效果越好;阻尼系数存在较优区间,使得黏滞阻尼伸臂取得较好的减震效果。
The viscous damping outrigger truss is a kind of seismic energy dissipation technology, which is composed of outrigger truss and viscous damper. The viscous damper is set up vertically at the end of outrigger truss. To the frame-core tube structure, which is located in a high seismic intensity region, the viscous damping outrigger truss can not only decrease seismic action effectively, but also avoid the adverse effects caused by the traditional rigid outrigger truss. In order to study the seismic energy dissipation of viscous damping outrigger in the structural seismic performance of super high-rise building, the seismic energy dissipation mechanism of viscous damping outrigger was verified. The influences of viscous damper parameters and outrigger truss stiffness on the decreasing amplitude ratio were analyzed. The results show that the seismic energy dissipating mechanism includes additional damping and equivalent dynamic stiffness. Considering efficiency and economy together, the outrigger truss stiffness has an appropriate value. Generally, the smaller the damping exponent is, the more effective the viscous damper is. There is an optimal range for the damping coefficient to get a relatively high decreasing amplitude ratio. © 2016, Editorial Office of Journal of Building Structures. All right reserved.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2016年第S1期48-54,共7页
Journal of Building Structures
