某八层混凝土框架结构火灾连续倒塌模拟
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摘要
为了模拟火灾下结构倒塌破坏行为,需要开发能够反映结构火灾整体行为的高效数值模型。该文基于纤维梁模型和分层壳模型开发了混凝土框架火灾倒塌分析程序,对程序中采用的材料高温力学模型进行了分析与检验,并通过对构件抗火性能试验的模拟验证了程序的计算精度。最后,该文利用该倒塌分析程序对一个八层框架结构的火灾倒塌过程进行了模拟,分析了结构在火灾下的倒塌机理。
High efficient numerical models that can simulate the behaviors of an entire structural system are very important to the study on the fire-induced progressive collapse of RC frame structures.A fire-induced collapse simulation program is developed,which is based on the fiber beam model and the multi-layer shell model.The constitutive models of materials at high temperature are discussed.And the accuracy of the program in simulating RC members in fire is verified by test results.At last,the progressive collapse of an 8-storey frame in fire is simulated and the mechanism of collapse is discussed.
High efficient numerical models that can simulate the behaviors of an entire structural system are very important to the study on the fire-induced progressive collapse of RC frame structures.A fire-induced collapse simulation program is developed,which is based on the fiber beam model and the multi-layer shell model.The constitutive models of materials at high temperature are discussed.And the accuracy of the program in simulating RC members in fire is verified by test results.At last,the progressive collapse of an 8-storey frame in fire is simulated and the mechanism of collapse is discussed.
引文
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[4]陈适才,任爱珠,王静峰,陆新征.钢筋混凝土楼板火灾反应数值计算模型[J].工程力学,2008,25(3):107―112.Chen Shicai,Ren Aizhu,Wang Jingfeng,Lu Xinzheng.Numerical modeling of reinforced concrete slabs subjected to fire[J].Engineering Mechanics,2008,25(3):107―112.(in Chinese)
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[11]陆新征,李易,叶列平,马一飞,梁益.钢筋混凝土框架结构抗连续倒塌设计方法的研究[J],工程力学,2008,25(增刊II):150―157.Lu Xinzheng,Li Yi,Ye Lieping,Ma Yifei,Liang Yi.Study on design method to resist progressive collapse for reinforced concrete frames[J].Engineering Mechanics,2008,25(Sup.II):150―157.(in Chinese)
[12]GB50016-2006,建筑设计防火规范[S].北京:中国计划出版社,2006.GB50016-2006,Code of design on building fire protection and prevention[S].Beijing:China Planning Press,2006.(in Chinese)
[2]叶列平,陆新征,马千里,汪训流,缪志伟.混凝土结构抗震非线性分析模型、方法及算例[J].工程力学,2006,23(增刊II):131―140.Ye Lieping,Lu Xinzheng,Ma Qianli,Wang Xunliu,Miao Zhiwei.Nonlinear analytical models,methods and examples for concrete structures subject to earthquake loading[J].Engineering Mechanics,2006,23(sup.II):131―140.(in Chinese)
[3]陈适才,陆新征,任爱珠,江见鲸.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.Chen Shicai,Lu Xinzheng,Ren Aizhu,Jiang Jianjing.Fiber beam element model for the collapse simulation of concrete structures under fire[J].Chinese Journal of Computational Mechanics,2009,26(1):72―79.(in Chinese)
[4]陈适才,任爱珠,王静峰,陆新征.钢筋混凝土楼板火灾反应数值计算模型[J].工程力学,2008,25(3):107―112.Chen Shicai,Ren Aizhu,Wang Jingfeng,Lu Xinzheng.Numerical modeling of reinforced concrete slabs subjected to fire[J].Engineering Mechanics,2008,25(3):107―112.(in Chinese)
[5]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.Guo Zhenhai,Shi Xudong.Behaviour of reinforced concrete at elevated temperature and its calculation[M].Beijing:Tsinghua University Press,2003.(in Chinese)
[6]Williams-Leir G.Creep of structural steel in fire:Analytical expressions[J].Fire and Material,1983,7(2):73―78.
[7]Bailey C G.Development of computer software to simulate the structural behaviour of steel-framed buildings in fire[J].Computers and Structures,1998(6):421―438.
[8]陈礼刚.钢筋混凝土板受火性能的试验研究[D].西安:西安建筑科技大学,2004.Chen Ligang.The Experimental research of reinforced concrete slab[D].Xi’an:Xi’an University of Architecture and Technology,2004.(in Chinese)
[9]Linus Lim,Colleen Wade.Experimental fire tests of two-way concrete slabs[R].Christchnrch,New Zealand:Fire Engineering Research Report 02/12,University of Canterbury,2002.
[10]张雷明,刘西拉.钢筋混凝土结构倒塌分析的前沿研究[J].地震工程与工程振动,2003,23(3):47―52.Zhang Leiming,Liu Xila.Forward research of collapse analysis of reinforced concrete structures[J].Earthquake Engineering and Engineering Vibration,2003,23(3):47―52.(in Chinese)
[11]陆新征,李易,叶列平,马一飞,梁益.钢筋混凝土框架结构抗连续倒塌设计方法的研究[J],工程力学,2008,25(增刊II):150―157.Lu Xinzheng,Li Yi,Ye Lieping,Ma Yifei,Liang Yi.Study on design method to resist progressive collapse for reinforced concrete frames[J].Engineering Mechanics,2008,25(Sup.II):150―157.(in Chinese)
[12]GB50016-2006,建筑设计防火规范[S].北京:中国计划出版社,2006.GB50016-2006,Code of design on building fire protection and prevention[S].Beijing:China Planning Press,2006.(in Chinese)
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