（1 合肥工业大学土木与水利工程学院， 合肥 230009； 2 清华大学北京市钢与混凝土组合结构工程技术研究中心， 北京 100084； 3 北京市建筑设计研究院， 北京 100045； 4 清华大学土木工程安全与耐久教育部重点实验室， 北京 100084）

［摘要］伸臂桁架是高层建筑中的重要抗侧力构件，其耗能能力对结构抗震性能有着重要影响。普通伸臂桁架由于斜腹杆屈曲导致耗能能力存在不足，而将普通伸臂桁架的斜腹杆改为防屈曲支撑（BRB）则可以有效提高其耗能能力。以一高度为230-9m的高层建筑为工程背景，通过弹塑性时程分析，对比采用普通伸臂桁架和BRB伸臂桁架的高层建筑耗能机制。研究表明：BRB伸臂桁架较普通伸臂桁架具有更好的变形能力和耗能能力；结构采用不同的伸臂桁架会对其在地震作用下的地震能量输入和耗能分布产生一定影响；不同的伸臂桁架不仅影响其本身所占塑性耗能百分比，同时对结构中其他构件耗能贡献也有影响，并对主要塑性耗能单元——剪力墙影响显著。

［关键词］普通伸臂桁架； BRB伸臂桁架； 耗能机制

中图分类号：TU973-2文献标识码：A文章编号：1002-848X(2018)21-0009-05

Comparison on energy dissipation mechanism of high-rise buildings using ordinary outriggers and BRB outriggers

Jiang Qing1， Zhu Yaning1， Yang Qingshun2， Zhen Wei3， Lu Xinzheng4

(1 School of Civil Engineering, Hefei University of Technology, Hefei 230009, China;  2 Beijing Engineering Research Center of Steel and Concrete Composite Structures, Tsinghua University, Beijing 100084, China；3 Beijing Institute of Architectural Design, Beijing 100045, China；4 Key Laboratory of Civil Engineering Safety and Durability of  China Education Ministry, Tsinghua University, Beijing 100084, China)

Abstract:Outriggers are important lateral force resisting members in high-rise buildings, and their energy dissipation capacity has a significant impact on structural seismic performance. Since ordinary outriggers have insufficient energy dissipation capacity due to the buckling of diagonal web members, the energy dissipation capacity can be effectively improved if its diagonal web members are replaced by buckling restrained brace (BRB). Based on a high-rise building with a height of 230-9 m, the energy dissipation mechanism of the high-rise building was compared by using ordinary outriggers and BRB outriggers through nonlinear time-history analysis. The research indicates that the deformation and energy dissipation capacity of BRB outriggers are better than the ordinary outriggers; different outriggers in structures have some impact on the seismic energy input and energy distribution; different outriggers affect its own percentage share of plastic energy dissipation, and at the same time, they also have an impact on the energy dissipation contribution of other members in the structure, especially having a significant impact on the shear wall, which is the  main plastic energy dissipation unit.

Keywords:ordinary outrigger; buckling restrained brace(BRB) outrigger; energy dissipation mechanism

* 国家自然科学基金项目（51408179），亚热带建筑科学国家重点实验室（2015ZA04)。

作者简介：蒋庆，博士，副教授，Email: ahhfjq@163.com。