火灾下钢筋混凝土框架结构倒塌数值模拟
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（北京市建筑设计研究院有限公司， 北京 100045）［摘要］基于ABAQUS对钢筋混凝土框架结构在火灾下的倒塌数值模拟进行了研究。采用纤维梁单元模拟框架梁和柱，编制了可用于应力温度耦合场、可考虑材料失效的混凝土和钢筋材料单轴本构用户子程序，通过材料失效模拟单元的破坏；采用壳单元模拟钢筋混凝土楼板，考虑了钢筋混凝土楼板的刚度削弱、钢筋拉断；采用单元接触考虑了倒塌过程中单元之间的碰撞。以某钢筋混凝土框架结构为例，对其在火灾下的倒塌机理进行了分析。［关键词］火灾; 倒塌; 数值模拟; 框架结构中图分类号：TU375.4 文献标识码：A 文章编号：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作者简介：閤东东，博士，高级工程师，一级注册结构工程师，Email：gddhust@gmail.com。参考文献［1］过镇海, 时旭东. 钢筋混凝土的高温性能及其计算［M］. 北京: 清华大学出版社, 2003.［2］陆洲导, 朱伯龙. 钢筋混凝土框架火灾反应分析［J］. 土木工程学报, 1995, 28(6): 18-27.［3］陈适才，任爱珠，陆新征.火灾下空间混凝土框架结构的反应分析与模拟［J］.自然灾害学报, 2007, 16(6): 88-92.［4］陈适才，陆新征，任爱珠. 基于纤维梁模型的火灾下多层混凝土框架非线性分析［J］. 建筑结构学报, 2009, 30(6): 6-53.［5］陈适才, 陆新征, 任爱珠, 等. 火灾下混凝土结构破坏模拟的纤维梁单元模型［J］. 计算力学学报, 2009,26(1): 72-79.［6］李易, 陆新征, 任爱珠, 等. 某八层混凝土框架结构火灾连续倒塌模拟［J］. 工程力学, 2011, 28(S1): 53-59.［7］李易. RC框架结构抗连续倒塌设计方法研究［D］. 北京: 清华大学， 2011.［8］李易, 陆新征, 任沛琪, 等. 一种模拟火灾连续倒塌的等效时间方法［J］. 建筑科学， 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］閤东东，李文峰，张俊兵，等. 长周期地震波作用下超高层结构连续倒塌数值分析［J］. 建筑结构，2014,44(18):54-58.
