某框架結(jié)構(gòu)增設(shè)防屈曲支撐抗震加固效果分析
閤東東,李文峰,苗啟松
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(北京市建筑設(shè)計研究院有限公司, 北京 100045)[摘要]對未加固和采用防屈曲支撐加固后的某框架結(jié)構(gòu)進行了罕遇地震作用下的連續(xù)倒塌比較分析。分析結(jié)果表明,未加固的框架結(jié)構(gòu)在罕遇地震作用下產(chǎn)生了連續(xù)倒塌,采用防屈曲支撐加固后的框架結(jié)構(gòu)在罕遇地震作用下未產(chǎn)生倒塌,最大層間位移角達(dá)到1/59,部分框架柱邊緣混凝土出現(xiàn)壓潰但未全截面壓潰,但底層部分防屈曲支撐退出工作。防屈曲支撐起到了較好的消能減震作用,提高了結(jié)構(gòu)的抗震性能,可見采用防屈曲支撐進行加固是必要的,提及的分析方法可為帶消能減震構(gòu)件的結(jié)構(gòu)防連續(xù)倒塌分析提供參考。[關(guān)鍵詞]框架結(jié)構(gòu); 連續(xù)倒塌; 罕遇地震; 防屈曲支撐中圖分類號:TU311.3,TU375.4 文獻標(biāo)識碼:A 文章編號:1002-848X(2015)09-0026-05Seismic reinforcement performance analysis of a frame structure strengthenedwith buckling restrained braceGe Dongdong, Li Wenfeng, Miao Qisong(Beijing Institute of Architectural Design, Beijing 100045, China)Abstract: Under rare earthquake action, progressive-collapse analysis of a structure strengthened with buckling restrained brace and unstrengthened structure was conducted. The analysis results show that the unstrengthened structure continuously collapses under rare earthquake action while the structure strengthened with buckling restrained brace does not occur progressive-collapse under rare earthquake action and the maximal story drift angle reaches 1/59. Edge concrete of some frame columns crush but not for the whole cross section, and part of the bulking restrained braces on the bottom floor are out of working. Buckling restrained braces play a significant role in energy dissipation, and seismic performance of the structure has been improved. Thus, it can be seen that it is necessary to adopt buckling restrained brace for structure and the proposed method can be used to study the progressive-collapse prevention of structure with energy dissipation components.Keywords: frame structure; progressive-collapse; rare earthquake; buckling restrained brace作者簡介:閤東東,博士,高級工程師,一級注冊結(jié)構(gòu)工程師,Email:gddhust@gmail.com。參考文獻[1]馬玉虎. 汶川地震典型框架結(jié)構(gòu)震害分析和防倒塌對策研究[D]. 北京: 清華大學(xué), 2010.[2]葉列平, 陸新征, 趙世春, 等. 框架結(jié)構(gòu)抗地震倒塌能力的研究——汶川地震極震區(qū)幾個框架結(jié)構(gòu)震害案例的分析[J].建筑結(jié)構(gòu)學(xué)報,2009,30(6): 67-76.[3]齊建偉,郝貴強,杜永山, 等. 防屈曲支撐加固混凝土框架設(shè)計研究[J]. 建筑結(jié)構(gòu), 2012,42(3): 112-115.[4]趙佳, 彭飛飛, 韓雪, 等. 防屈曲鋼支撐加固某食堂結(jié)構(gòu)的彈塑性時程分析[J]. 工程抗震與加固改造, 2012, 34(1): 89-93.[5]陸新征, 林旭川, 葉列平, 等.地震下高層建筑連續(xù)倒塌數(shù)值模型研究 [J]. 工程力學(xué), 2010, 27(11): 64-70.[6]梁益, 陸新征, 李易,等.三層RC框架的抗連續(xù)倒塌設(shè)計[J].解放軍理工大學(xué)學(xué)報:自然科學(xué)版, 2007, 8(6): 659-664.[7]陸新征, 馬玉虎, 唐代遠(yuǎn), 等. 汶川地震典型RC框架結(jié)構(gòu)抗倒塌加固效果分析[J]. 建筑科學(xué)與工程學(xué)報, 2011,28(2): 21-26.[8]唐代遠(yuǎn), 陸新征, 馬玉虎, 等. 鋼支撐滯回模型及防倒塌加固效果分析[J]. 工程抗震與加固改造, 2011, 33(4): 94-100.