摘要
为研究全钢屈曲约束支撑(ASBRB)对大跨空间桁架结构减震控制作用,在某体育馆屋盖不同部位设置ASBRB,输入三向地震动进行时程分析。以屋盖结构水平向位移及构件内力作为减震控制目标。研究表明:设置ASBRB能有效抑制结构在不同地震烈度下的响应;屋盖结构上均匀布置ASBRB比集中布置减震效果好;结构减震控制受ASBRB的屈服荷载及芯材屈服点影响显著;常遇地震时ASBRB处于弹性状态,提供附加刚度以减小结构地震响应;罕遇地震时大部分ASBRB进入塑性状态,通过拉压屈服耗散地震输入能量。不同地震动输入下ASBRB的滞回曲线均较饱满,呈现典型位移相关型阻尼器特征。
The study of seismic damage control was carried out for large-span spacal truss structures by placing allsteel buckling restraining braces(ASBRB) at different locations on the roof.Time history analyses were performed with three-dimensional earthquake ground motion inputs for a gymnasium building.Taking the displacement in the horizontal direction and member forces in the roof structure as the targets of the vibration control,the analytical results indicated that the seismic responses were effectively controlled via installing the ASBRB in the spacial truss structure.Uniform placement of ASBRB showed better performance when compared with that of centralized placement.The efficiency of vibration reduction was greatly influenced by yield load and yield point of ASBRB.The ASBRB remained in elastic condition during frequent earthquake,and provided the additional stiffness to reduce the structural seismic responses.Under the rare earthquake ground excitation,the most of ASBRB entered plastic phase and began to dissipate the earthquake energy.The energy dissipation hysteresis curves of ASBRB were full under different seismic input,and displayed the classic characteristic of displacement-dependent dampers.
出处
《地震工程与工程振动》
CSCD
北大核心
2014年第3期165-173,共9页
Earthquake Engineering and Engineering Dynamics
基金
西安建筑科技大学结构工程与抗震教育部重点实验室开放基金项目(KL-SEER-ME-201202)
关键词
空间结构
屈曲约束支撑
低屈服点钢
消能减震
多维地震输入
space structures
buckling restrained brace
low yield point steel
energy dissipation
multidimensional earthquake input
