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(1 北京市建筑設(shè)計(jì)研究院有限公司， 北京 100045； 2 北京建筑大學(xué)土木與交通工程學(xué)院， 北京 100044)

［摘要］位于8度區(qū)某高度為280m超高層鋼結(jié)構(gòu)采用內(nèi)外筒方鋼管混凝土框架-中心鋼支撐（部分防屈曲支撐BRB）-伸臂桁架-環(huán)帶桁架結(jié)構(gòu)體系，共設(shè)置了863根普通鋼支撐，并在結(jié)構(gòu)底部加強(qiáng)區(qū)部分斜撐處和伸臂桁架腹桿處一共設(shè)置了104根防屈曲支撐。通過有限元法對(duì)普通鋼支撐拉壓不對(duì)稱進(jìn)行分析模擬。結(jié)果表明初始幾何缺陷對(duì)普通鋼支撐軸力的影響較大，長(zhǎng)細(xì)比越大受壓承載力下降越顯著。采用ABAQUS對(duì)該結(jié)構(gòu)進(jìn)行了動(dòng)力彈塑性時(shí)程分析，對(duì)結(jié)構(gòu)在罕遇地震作用下的抗震性能進(jìn)行了論證分析。結(jié)果表明，該結(jié)構(gòu)滿足"大震不倒"的抗震設(shè)防目標(biāo)。

［關(guān)鍵詞］防屈曲支撐；伸臂桁架；超高層結(jié)構(gòu)；鋼結(jié)構(gòu)；抗震性能

中圖分類號(hào)：TU973-31文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)08-0037-06

Analysis on seismic performance of a super high-rise steel structure with outriggers using BRBs

CHEN Xi1, GE Dongdong1, SU Yukun1, XIE Linlin2, WU Lianhong1, LI Wenfeng1, MIAO Qisong1

(1 Beijing Institute of Architectural Design, Beijing 100045, China; 2 School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China)

Abstract:A super high-rise steel structure with a height of 280m located in the 8-degree seismic fortification area adopts the structural system of concrete-filled steel tube frame with inner and outer tubes-central steel braces (including some bucking restrained braces(BRB) )-outriggers-ring belt trusses. A total of 863 ordinary steel braces are arranged, and a total of 104 BRBs are set up at the part of the diagonal braces in the reinforcement area at the bottom of the structure and the web members of the outriggers. Tension-compression asymmetry of common steel braces were simulated through finite element method. The results show that initial geometric imperfection has a greater influence impact on the axial force of common steel braces, and the greater the slenderness ratio, the more significant the reduction in compressive bearing capacity. ABAQUS software was used to conduct dynamic elastoplastic time-history analysis of the structure, and the seismic performance of the structure was demonstrated and analyzed under the action of rare earthquakes. The results show that the structure satisfies the seismic fortification goal of “not falling under the rare earthquake”.

Keywords:buckling restrained brace;outrigger;super high-rise structure;steel structure;seismic performance

*國(guó)家自然科學(xué)基金項(xiàng)目(51808029)。

作者簡(jiǎn)介：閤東東，博士，教授級(jí)高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：gddhust@163.com。