火災(zāi)下鋼筋混凝土框架結(jié)構(gòu)倒塌數(shù)值模擬
閤東東，李文峰，苗啟松
- 摘 要
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（北京市建筑設(shè)計(jì)研究院有限公司， 北京 100045）［摘要］基于ABAQUS對(duì)鋼筋混凝土框架結(jié)構(gòu)在火災(zāi)下的倒塌數(shù)值模擬進(jìn)行了研究。采用纖維梁?jiǎn)卧M框架梁和柱，編制了可用于應(yīng)力溫度耦合場(chǎng)、可考慮材料失效的混凝土和鋼筋材料單軸本構(gòu)用戶(hù)子程序，通過(guò)材料失效模擬單元的破壞；采用殼單元模擬鋼筋混凝土樓板，考慮了鋼筋混凝土樓板的剛度削弱、鋼筋拉斷；采用單元接觸考慮了倒塌過(guò)程中單元之間的碰撞。以某鋼筋混凝土框架結(jié)構(gòu)為例，對(duì)其在火災(zāi)下的倒塌機(jī)理進(jìn)行了分析。［關(guān)鍵詞］火災(zāi); 倒塌; 數(shù)值模擬; 框架結(jié)構(gòu)中圖分類(lèi)號(hào)：TU375.4 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2014)20-0060-04Numerical simulation of fire-induced collapse of reinforced concrete frame structureGe Dongdong, Li Wenfeng, Miao Qisong(Beijing Institute of Architectural Design, Beijing 100045, China)Abstract: Numerical simulation of progressive collapse of reinforced concrete frame structure subjected to the fire was studied on the basis of ABAQUS software. Beams and columns of reinforced concrete frame structure were modeled by fiber beam elements. Uniaxial constitutive models of the material of concrete and rebar, which were incorporated into user subroutines, could be applied to temperature and stress coupling field and material failure was also considered. Failure of structural elements was realized by damage and failure of materials. Reinforced concrete slab was simulated by shell element which considered stiffness degradation of reinforced concrete slab and tension failure of rebar. Element contact was also considered to simulate collision in structure collapse. A frame structure was taken as an example to study collapse mechanism of the structure subjected to fire.Keywords: fire; collapse; numerical simulation; frame structure作者簡(jiǎn)介：閤東東，博士，高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：gddhust@gmail.com。參考文獻(xiàn)［1］過(guò)鎮(zhèn)海, 時(shí)旭東. 鋼筋混凝土的高溫性能及其計(jì)算［M］. 北京: 清華大學(xué)出版社, 2003.［2］陸洲導(dǎo), 朱伯龍. 鋼筋混凝土框架火災(zāi)反應(yīng)分析［J］. 土木工程學(xué)報(bào), 1995, 28(6): 18-27.［3］陳適才，任愛(ài)珠，陸新征.火災(zāi)下空間混凝土框架結(jié)構(gòu)的反應(yīng)分析與模擬［J］.自然災(zāi)害學(xué)報(bào), 2007, 16(6): 88-92.［4］陳適才，陸新征，任愛(ài)珠. 基于纖維梁模型的火災(zāi)下多層混凝土框架非線性分析［J］. 建筑結(jié)構(gòu)學(xué)報(bào), 2009, 30(6): 6-53.［5］陳適才, 陸新征, 任愛(ài)珠, 等. 火災(zāi)下混凝土結(jié)構(gòu)破壞模擬的纖維梁?jiǎn)卧Ｐ停跩］. 計(jì)算力學(xué)學(xué)報(bào), 2009,26(1): 72-79.［6］李易, 陸新征, 任愛(ài)珠, 等. 某八層混凝土框架結(jié)構(gòu)火災(zāi)連續(xù)倒塌模擬［J］. 工程力學(xué), 2011, 28(S1): 53-59.［7］李易. RC框架結(jié)構(gòu)抗連續(xù)倒塌設(shè)計(jì)方法研究［D］. 北京: 清華大學(xué)， 2011.［8］李易, 陸新征, 任沛琪, 等. 一種模擬火災(zāi)連續(xù)倒塌的等效時(shí)間方法［J］. 建筑科學(xué)， 2013, 29(9): 8-12.［9］Eurocode 4 Design of composite steel and concrete structures. Part 1.2: structural fire design ［S］. ENV1994-1-1, Brussels: Commission of the European Communities, 1993.［10］閤東東，李文峰，張俊兵，等. 長(zhǎng)周期地震波作用下超高層結(jié)構(gòu)連續(xù)倒塌數(shù)值分析［J］. 建筑結(jié)構(gòu)，2014,44(18):54-58.
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