- 摘 要
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(1 鄭州工程技術(shù)學(xué)院土木工程學(xué)院， 鄭州 450044；2 上海建工二建集團有限公司， 上海 200080)
［摘要］為了研究核心筒懸掛鋼結(jié)構(gòu)在施工過程中的抗連續(xù)倒塌性能，采用備用荷載路徑法，運用MIDAS Gen軟件對浦東新區(qū)黃浦江沿岸E8單元E17.4商業(yè)辦公樓項目進行了連續(xù)倒塌分析研究，從結(jié)構(gòu)模型中移除選定的關(guān)鍵受力構(gòu)件，模擬結(jié)構(gòu)施工過程中構(gòu)件因偶然荷載的瞬間失效，通過計算結(jié)構(gòu)在構(gòu)件拆除后剩余結(jié)構(gòu)的內(nèi)力和變形，研究懸掛鋼結(jié)構(gòu)的倒塌機制并對其進行連續(xù)倒塌風(fēng)險評估。結(jié)果表明：核心筒懸掛鋼結(jié)構(gòu)具有一定的抗連續(xù)倒塌能力，當(dāng)失效1根關(guān)鍵構(gòu)件時結(jié)構(gòu)仍處于安全狀態(tài)；當(dāng)同時失效2根關(guān)鍵構(gòu)件時結(jié)構(gòu)接近倒塌風(fēng)險，建議采取額外的設(shè)計加強措施。
［關(guān)鍵詞］核心筒懸掛鋼結(jié)構(gòu)；備用荷載路徑法；連續(xù)性倒塌；倒塌機制；傳力路徑；非線性靜力分析
中圖分類號：TU398-2 文獻標(biāo)識碼：A文章編號：1002-848X(2021)18-0069-05
Progressive collapse research of corewall suspended steel structure based on alternate load path method
GUO Yankun1, XIA Yibing2, MA Yueqiang2
(1 College of Civil Engineering, Zhengzhou University of Technology, Zhengzhou 450044， China；2 Shanghai Construction No.2(Group)Co., Ltd., Shanghai 200080， China)
Abstract: In order to study the progressive collapse resistance performance of corewall suspended structure during construction, the backup load path method was used to analyze the progressive collapse of E17.4 commercial office building project of E8 unit along the Huangpu River in Pudong New Area by using MIDAS Gen software. The selected sensitive stress components were removed from the structural model to simulate the instantaneous failure of components due to accidental load during construction. By calculating the internal force and deformation of the remaining structure after the removal of the members, the collapse mechanism of the suspended steel structure was studied and the risk of progressive collapse was assessed. The results show that the corewall suspended steel structure has a certain resistance to progressive collapse, and the structure is still in a safe state when one key member fails. When two critical components fail at the same time, the structure approaches collapse risk and additional design strengthening measures were recommended.
Keywords:corewall suspended steel structure； alternate load path method； progressive collapse； collapse mechanism； force transmission path； pushover analysis
作者簡介：郭艷坤，碩士，講師，Email:guoyankun2002@163.com。
