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（1 合肥工業(yè)大學(xué)土木與水利工程學(xué)院， 合肥 230009； 2 清華大學(xué)北京市鋼與混凝土組合結(jié)構(gòu)工程技術(shù)研究中心， 北京 100084； 3 北京市建筑設(shè)計(jì)研究院， 北京 100045； 4 清華大學(xué)土木工程安全與耐久教育部重點(diǎn)實(shí)驗(yàn)室， 北京 100084）

［摘要］伸臂桁架是高層建筑中的重要抗側(cè)力構(gòu)件，其耗能能力對(duì)結(jié)構(gòu)抗震性能有著重要影響。普通伸臂桁架由于斜腹桿屈曲導(dǎo)致耗能能力存在不足，而將普通伸臂桁架的斜腹桿改為防屈曲支撐（BRB）則可以有效提高其耗能能力。以一高度為230-9m的高層建筑為工程背景，通過彈塑性時(shí)程分析，對(duì)比采用普通伸臂桁架和BRB伸臂桁架的高層建筑耗能機(jī)制。研究表明：BRB伸臂桁架較普通伸臂桁架具有更好的變形能力和耗能能力；結(jié)構(gòu)采用不同的伸臂桁架會(huì)對(duì)其在地震作用下的地震能量輸入和耗能分布產(chǎn)生一定影響；不同的伸臂桁架不僅影響其本身所占塑性耗能百分比，同時(shí)對(duì)結(jié)構(gòu)中其他構(gòu)件耗能貢獻(xiàn)也有影響，并對(duì)主要塑性耗能單元——剪力墻影響顯著。

［關(guān)鍵詞］普通伸臂桁架； BRB伸臂桁架； 耗能機(jī)制

中圖分類號(hào)：TU973-2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

* 國(guó)家自然科學(xué)基金項(xiàng)目（51408179），亞熱帶建筑科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室（2015ZA04)。

作者簡(jiǎn)介：蔣慶，博士，副教授，Email: ahhfjq@163.com。