摘要
损伤对单层网壳结构的受力性能极为不利,使得原本抗震性能优异的网壳在强震作用下也会出现失效、倒塌的可能性。BRB(约束屈曲支撑)是目前广泛应用的耗能减震构件,施工安装方便、经济、设计灵活且不影响建筑物美观,不仅成为新建结构抗震设计的较佳选择,也是已建结构抗震加固和改造的重要手段。利用ANSYS有限元软件,对一个跨度60m的单层受损网壳结构进行数值模拟,将BRB应用在受损结构的抗震加固中,提出3种抗震加固方案,对比分析其在静力作用下的结构安全性以及在EL-CENTRO波、天津波、TAFT波罕遇地震作用下的弹塑性响应。结果表明,采用BRB加固后的结构在满足静力安全性的前提下能够很好地改善结构的抗震性能。
The mechanical properties of damaged single layer reticulated shell is extremely disadvantage and prone to be failure and collapse under the strong earthquake.Recently,BRB （Buckling Restrained Brace）,which can be easily installed,designed flexibly,has been widely used in seismic energy dissipation member.Numerical simulation of a 60 meters damaged reticulated shells is carried out by ANSYS finite-element software.Three seismic strengthening methods have proposed and the BRB is also used in the damaged structure.The comparative analysis of the structures＇ safety under static load and the elastoplastic response under earthquake record are presented.The results shows that the BRB-strengthening structure has better damping effect in the case of satisfying the static security.
出处
《工程抗震与加固改造》
北大核心
2013年第6期111-116,共6页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金项目(51068019)
关键词
BRB
受损单层网壳结构
罕遇地震
抗震加固
静力安全性
BRB
damaged single layer reticulated shell
rare earthquake
seismic strengthening
static security
