某超高层混凝土结构火灾作用下的力学响应分析
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摘要
火灾是高层建筑安全的主要威胁之一。建筑物在火灾作用下的力学响应是整体结构的行为,其主要特点是结构系统内受火区域子结构的刚度和承载力随火灾的发展而变化,进而引起结构体系内的内力重分布。目前,针对高层结构构件的抗火性能已有相关研究开展,而对于高层混凝土结构的整体抗火性能方面的研究还并不多见。该文采用考虑高温作用的纤维梁和分层壳模型,对某超高层建筑结构进行了整体结构的抗火分析。通过模拟超高层结构不同部位在标准升温曲线作用下的整体结构响应,比较分析了火灾作用下超高层结构的抗火性能。最后,采用Pushdown方法分析了火灾作用下结构的抗倒塌性能。
Fire is one of the main threats to the safety of high-rise structures. The mechanical response of a building under fire is the behavior of the overall structure of which the main feature is that the structural stiffness and bearing capacity of heated sub-structures vary with the fire development and in turn lead to the redistribution of the internal forces within the structural system. Currently, the relevant researches about the fire resistance of structural members of high-rise structures have been performed, but the study of the overall fire resistance performance of high-rise concrete structures is rare. In this paper, the fiber beam model and the multi-layer shell model that allow for the effect of high temperature are used to analyze the overall fire resistance performance of a high-rise concrete structure. Through simulating the different parts of the overall structure under the standard fire scenario, a comparative analysis of the fire resistance of super tall structures is taken. Finally, Pushdown method is used to analyze the collapse-resistant capacity under fire.
Fire is one of the main threats to the safety of high-rise structures. The mechanical response of a building under fire is the behavior of the overall structure of which the main feature is that the structural stiffness and bearing capacity of heated sub-structures vary with the fire development and in turn lead to the redistribution of the internal forces within the structural system. Currently, the relevant researches about the fire resistance of structural members of high-rise structures have been performed, but the study of the overall fire resistance performance of high-rise concrete structures is rare. In this paper, the fiber beam model and the multi-layer shell model that allow for the effect of high temperature are used to analyze the overall fire resistance performance of a high-rise concrete structure. Through simulating the different parts of the overall structure under the standard fire scenario, a comparative analysis of the fire resistance of super tall structures is taken. Finally, Pushdown method is used to analyze the collapse-resistant capacity under fire.
引文
[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.Guo Zhenhai,Shi Xudong.Behaviour of reinforced concrete at elevated temperature and its calculation[M].Beijing:Tsinghua University Press,2003.(in Chinese)
[2]Han L H,Wang W H,Yu H X.Experimental behaviour of reinforced concrete(RC)beam to concrete-filled steel tubular(CFST)column frames subjected to ISO-834standard fire[J].Engineering Structures,2010,32(10):3130―3144.
[3]British Steel.The behaviour of multi-storey steel frame buildings in fire[M].British Steel,Rotherham,United Kingdom,1999:82.
[4]吕西林,范力,赵斌.装配式预制混凝土框架结构缩尺模型拟动力试验研究[J].建筑结构学报,2009,26(1):72―79.LüXilin,Fan Li,Zhao Bin.Experimental study on seismic behavior of precast concrete beam column subassemblage with fully assembled joint[J].Journal of Computation Mechanics,2009,26(1):72―79.(in Chinese)
[5]Sun R,Huang Z,Burgess I W.Progressive collapse analysis of steel structures under fire conditions[J].Engineering Structures,2012,34:400―413.
[6]Huang Z.Modelling of reinforced concrete structures in fire,proceedings of the institution of civil engineers[J].Engineering and Computational Mechanics,2010,163(EM1):43―53.
[7]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.Firer beam element model for the collapse simulation of concrete structures under fire[J].Journal of Computational Mechanics,2009,26(1):72―79.(in Chinese)
[8]李易,陆新征,叶列平,任爱珠.混凝土框架结构火灾连续倒塌数值分析模型[J].工程力学,2012,29(4):96―112.Li Yi,Lu Xinzheng,Ye Lieping,Ren Aizhu.Numerical models of fire induced progressive collapse analysis for reinforced concrete frame structures[J].Engineering Mechanics,2012,29(4):96―112.(in Chinese)
[9]Lange D,R?ben C,Usmani A.Tall building collapse mechanisms initiated by fire:Mechanisms and design methodology[J].Engineering Structures,2012,36:90―103.
[10]李易,陆新征,英明鉴,等.某框支砌体结构火灾倒塌事故的模拟与分析[J].工程力学,2014,31(2):66―72.Li Yi,Lu Xinzheng,Ying Mingjian,et al.The simulation and analysis of the collapse of a frame-supported masonry structure under fire[J].Engineering Mechanics,2014,31(2):66―72.(in Chinese)
[11]Moehle J,Bozorgnia Y,Jayaram N,et al.Case studies of the seismic performance of tall buildings designed by alternative means[R].Berkeley,California:Pacific Earthquake Engineering Research Center,University of California,2011.
[12]Li Mengke,Lu Xinzheng,Lu Xiao,Ye Lieping.A preliminary comparison of the seismic design of tall RC frame-core tube structures between China and the United States[C].Advances in Structural Engineering and Mechanics(ASEM13),Jeju,Korea,2013:4204―4211.
[13]陆新征,林旭川,叶列平,李易,唐代远.地震下高层建筑连续倒塌数值模型研究[J].工程力学,2010,27(11):64―70.Lu Xinzheng,Lin Xuchuan,Ye Lieping,Li Yi,Tang Daiyuan.Numerical models for the progressive collapse of high-rise buildings due to earthquake[J].Engineering Mechanics,2010,27(11):64―70.(in Chinese)
[14]Eurocode4:Design of composite steel and concrete structures.Part1.2:Structural fire design[S].Commission of the European Communities,Brussels,1993.
[15]ISO 834-1,Fire-resistance tests-elements of building construction-Part 1:General requirements.International standard ISO 834[S].Geneva,1999.
[16]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)
[17]Gao W Y,Dai J G,Teng J G,et al.Finite element modeling of reinforced concrete beams exposed to fire[J].Engineering Structures,2013,52:488―501.
[18]MSC.MARC.Volume D:User suroutines and special routines[M].Santa Ana:California,2005.
[19]李易,陆新征,叶列平.基于能量方法的RC框架结构连续倒塌抗力需求分析II:悬链线机制[J].建筑结构学报,2011,32(11):9―16.Li Yi,Lu Xinzheng,Ye Lieping.Progressive collapse resistance demand of RC frame structures based on energy method II:catenary mechanism[J].Journal of Building Structures,2011,32(11):9―16.(in Chinese)
[20]GB50010-2010,混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.GB50010-2010,Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[21]GB/T 9978.1-2008,建筑构件耐火试验方法[S].北京:中国标准出版社,2008.GB/T 9978.1-2008,Fire-resistance tests-elements of building construction[S].Beijing:China Planning Press,2008.(in Chinese)
[22]李易,陆新征,叶列平,等.基于Pushdown分析的RC框架抗连续倒塌承载力研究[J].沈阳建筑大学学报:自然科学版,2011,27(1):10―18.Li Yi,Lu Xinzheng,Ye Lieping,et al.Study on progressive collapse-resisting capacity of RC frame structures based on pushdown analysis[J].Journal of Shenyang Jianzhu University:Natural Science,2011,27(1):10―18.(in Chinese)
[2]Han L H,Wang W H,Yu H X.Experimental behaviour of reinforced concrete(RC)beam to concrete-filled steel tubular(CFST)column frames subjected to ISO-834standard fire[J].Engineering Structures,2010,32(10):3130―3144.
[3]British Steel.The behaviour of multi-storey steel frame buildings in fire[M].British Steel,Rotherham,United Kingdom,1999:82.
[4]吕西林,范力,赵斌.装配式预制混凝土框架结构缩尺模型拟动力试验研究[J].建筑结构学报,2009,26(1):72―79.LüXilin,Fan Li,Zhao Bin.Experimental study on seismic behavior of precast concrete beam column subassemblage with fully assembled joint[J].Journal of Computation Mechanics,2009,26(1):72―79.(in Chinese)
[5]Sun R,Huang Z,Burgess I W.Progressive collapse analysis of steel structures under fire conditions[J].Engineering Structures,2012,34:400―413.
[6]Huang Z.Modelling of reinforced concrete structures in fire,proceedings of the institution of civil engineers[J].Engineering and Computational Mechanics,2010,163(EM1):43―53.
[7]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.Firer beam element model for the collapse simulation of concrete structures under fire[J].Journal of Computational Mechanics,2009,26(1):72―79.(in Chinese)
[8]李易,陆新征,叶列平,任爱珠.混凝土框架结构火灾连续倒塌数值分析模型[J].工程力学,2012,29(4):96―112.Li Yi,Lu Xinzheng,Ye Lieping,Ren Aizhu.Numerical models of fire induced progressive collapse analysis for reinforced concrete frame structures[J].Engineering Mechanics,2012,29(4):96―112.(in Chinese)
[9]Lange D,R?ben C,Usmani A.Tall building collapse mechanisms initiated by fire:Mechanisms and design methodology[J].Engineering Structures,2012,36:90―103.
[10]李易,陆新征,英明鉴,等.某框支砌体结构火灾倒塌事故的模拟与分析[J].工程力学,2014,31(2):66―72.Li Yi,Lu Xinzheng,Ying Mingjian,et al.The simulation and analysis of the collapse of a frame-supported masonry structure under fire[J].Engineering Mechanics,2014,31(2):66―72.(in Chinese)
[11]Moehle J,Bozorgnia Y,Jayaram N,et al.Case studies of the seismic performance of tall buildings designed by alternative means[R].Berkeley,California:Pacific Earthquake Engineering Research Center,University of California,2011.
[12]Li Mengke,Lu Xinzheng,Lu Xiao,Ye Lieping.A preliminary comparison of the seismic design of tall RC frame-core tube structures between China and the United States[C].Advances in Structural Engineering and Mechanics(ASEM13),Jeju,Korea,2013:4204―4211.
[13]陆新征,林旭川,叶列平,李易,唐代远.地震下高层建筑连续倒塌数值模型研究[J].工程力学,2010,27(11):64―70.Lu Xinzheng,Lin Xuchuan,Ye Lieping,Li Yi,Tang Daiyuan.Numerical models for the progressive collapse of high-rise buildings due to earthquake[J].Engineering Mechanics,2010,27(11):64―70.(in Chinese)
[14]Eurocode4:Design of composite steel and concrete structures.Part1.2:Structural fire design[S].Commission of the European Communities,Brussels,1993.
[15]ISO 834-1,Fire-resistance tests-elements of building construction-Part 1:General requirements.International standard ISO 834[S].Geneva,1999.
[16]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)
[17]Gao W Y,Dai J G,Teng J G,et al.Finite element modeling of reinforced concrete beams exposed to fire[J].Engineering Structures,2013,52:488―501.
[18]MSC.MARC.Volume D:User suroutines and special routines[M].Santa Ana:California,2005.
[19]李易,陆新征,叶列平.基于能量方法的RC框架结构连续倒塌抗力需求分析II:悬链线机制[J].建筑结构学报,2011,32(11):9―16.Li Yi,Lu Xinzheng,Ye Lieping.Progressive collapse resistance demand of RC frame structures based on energy method II:catenary mechanism[J].Journal of Building Structures,2011,32(11):9―16.(in Chinese)
[20]GB50010-2010,混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.GB50010-2010,Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[21]GB/T 9978.1-2008,建筑构件耐火试验方法[S].北京:中国标准出版社,2008.GB/T 9978.1-2008,Fire-resistance tests-elements of building construction[S].Beijing:China Planning Press,2008.(in Chinese)
[22]李易,陆新征,叶列平,等.基于Pushdown分析的RC框架抗连续倒塌承载力研究[J].沈阳建筑大学学报:自然科学版,2011,27(1):10―18.Li Yi,Lu Xinzheng,Ye Lieping,et al.Study on progressive collapse-resisting capacity of RC frame structures based on pushdown analysis[J].Journal of Shenyang Jianzhu University:Natural Science,2011,27(1):10―18.(in Chinese)
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