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(中國中元國際工程有限公司, 北京 100089)
摘要: ?？陔p子塔?南塔結(jié)構(gòu)體系外側(cè)為巨型鋼管混凝土柱+鋼支撐框架,內(nèi)部為鋼板混凝土核心筒,二者之間為鋼結(jié)構(gòu)組合樓蓋,需進行抗火設(shè)計. 采用臨界溫度法對結(jié)構(gòu)進行抗火設(shè)計,基于抗火設(shè)計結(jié)果建立熱?固耦合整體結(jié)構(gòu)模型,繼而進行抗火災連續(xù)倒塌分析. 分析時考慮了高溫下構(gòu)件材料的剛度、屈服強度等折減以及構(gòu)件的溫度應力,同時對耐火極限后的構(gòu)件損壞進行了評價. 結(jié)果表明,采用臨界溫度法抗火設(shè)計以及基于整體結(jié)構(gòu)的火災全過程分析,基本可實現(xiàn)建筑結(jié)構(gòu)在火災時的抗連續(xù)倒塌設(shè)計目標,其中大跨組合鋼次梁為防連續(xù)倒塌薄弱構(gòu)件,轉(zhuǎn)換梁及鋼結(jié)構(gòu)節(jié)點需進行防火加強.
關(guān)鍵詞: ?？陔p子塔; 抗火設(shè)計; 臨界溫度法; 熱?固耦合結(jié)構(gòu)模型; 抗火災連續(xù)倒塌; 構(gòu)件損壞評價
中圖分類號:TU922 文獻標志碼:A 文章編號:1002?848X(2022)16?0017?05
DOI:10. 19701 / j. jzjg. ZJ200029
Fire resistance design of steel structure in Haikou Twin Towers?South Tower
LUO Youxin, ZHANG Tongyi, WANG Ning, ZHANG Song
(China IPPR International Engineering Co. , Ltd. , Beijing 100089, China)
Abstract: The Haikou Twin Towers?South Tower adopts the structural system of giant concrete?filled steel tubular column +steel braced frame on the outside, as well as a steel plate concrete corewall inside. There is steel structure composite floorbetween the frame and corewall. Fire resistance design was needed. The critical temperature method was used to design thestructure for fire resistance design. Based on the results of the fire resistance design, a thermal?solid coupled integralstructure model was established, and then the anti?progressive collapse analysis against fire was carried out. In theanalysis, the stiffness and yield strength reduction of the member material at high temperature and the temperature stress ofthe member were considered, and the damage of the member after the fire resistance limit was evaluated. The results showthat the fire resistance design of the critical temperature method and the fire whole process analysis based on the overallstructure can basically achieve the design goal of the building structure for anti?progressive collapse against fire. Amongthem, the large?span composite steel secondary beams are weak components to prevent progressive collapse, and thetransfer beams and steel structure nodes need to be strengthened for fire protection.
Keywords:Haikou Twin Towers; fire resistance design; critical temperature method; thermal?solid coupled integralstructure model; anti?progressive collapse against fire; component damage assessment
∗企業(yè)橫向科研基金項目(S2016032T).
第一作者:羅佑新,碩士,高級工程師,一級注冊結(jié)構(gòu)工程師,主要從事結(jié)構(gòu)設(shè)計工作,Email:luoyouxin@ ippr. net.
[引用本文] 羅佑新,張同億,王寧,等. ?？陔p子塔?南塔鋼結(jié)構(gòu)抗火設(shè)計[ J]. 建筑結(jié)構(gòu),2022,52( 16):17?21.LUO Youxin,ZHANG Tongyi,WANG Ning,et al. Fire resistance design of steel structure in Haikou Twin Towers?SouthTower[J]. Building Structure,2022,52(16):17?21.
