建筑结构地震火灾效应分析方法
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摘要
为在建筑结构设计时考虑地震引发火灾对建筑结构的作用和影响,提出建筑结构地震火灾效应分析计算方法,此方法结合结构地震反应分析与火灾热力反应分析,通过简化的建筑结构地震损伤模型,考虑地震损伤的同时,连接结构的热传导分析与热力分析,从而实现地震火灾效应计算。运用此方法对一单层和一多层混凝土框架分别进行了分析,并与没有考虑地震损伤时框架的高温试验结果进行了对比,分析结果表明,考虑地震作用后的结构在火灾下的破坏形态可发生改变,结构耐火极限随着地震作用的增加而降低。
Considering the impact of post-earthquake fire on building structures in structure design,an analysis method is proposed to analyze and simulate the response of building structures under post-earthquake fire.Based on the seismic response and thermal stress analysis,this method considers the structure seismic damage through a simplified seismic damage model,and the simulation of the response of building structures under post-earthquake fire was reached by linking the heat transfer analysis and thermal stress analysis to the results of seismic damage.A single-storey concrete frame and a multi-story concrete frame were analyzed with this method and compared with experimental results of the same concrete frame under fire without seismic damage.It is shown that the collapse mode may change for seismic damaged structures and the fire resistance decreases with the increasing of seismic damage degree.
Considering the impact of post-earthquake fire on building structures in structure design,an analysis method is proposed to analyze and simulate the response of building structures under post-earthquake fire.Based on the seismic response and thermal stress analysis,this method considers the structure seismic damage through a simplified seismic damage model,and the simulation of the response of building structures under post-earthquake fire was reached by linking the heat transfer analysis and thermal stress analysis to the results of seismic damage.A single-storey concrete frame and a multi-story concrete frame were analyzed with this method and compared with experimental results of the same concrete frame under fire without seismic damage.It is shown that the collapse mode may change for seismic damaged structures and the fire resistance decreases with the increasing of seismic damage degree.
引文
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[12]CHI K I,CHAN S L,ZHA X X.Nonlinear pre fire and post fire analysis of steel frames[J].Engineering Structures,2008,27(11):1689-1702.
[13]YASSIN M H,BAGCHI A,KODUR V.Numericalmodel for assessing the post-earthquake fire resistance of wood-stud wall[J].Annual Conference-Canadian Society for Civil Engineering,2009:1520-1529.
[14]CORTEA G DELLA,LANDOLFOB R,MAZZOLANI F M.Post-earthquake fire resistance of moment resisting steel frames[J].Fire Safety Journal,2003,38(7):593-612.
[15]CHEN SUWEN,LEEGEORGE C,LI GQ.A study on steel buildings subjected to earthquake and the following fire[C]//PRC-US Earthquake Engineering Forum for Young Researchers Harbin,China,2006.
[16]KODUR VKR,WANG T,CHENG F.Predicting the fire resistance behavior of high strcngth concrete columns[J].Cement&Concrete Composites,2004,26(2):141-153.
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[18]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]BORDEN F W.The1994Northridge earthquake and the fires that followed[C]∥Thirteenth Meeting of the UJNR Panelon Fire Research and Safety,1996,2:303-312.
[3]ZHAO S J,XIONG L Y,REN AIZHU.A spatial-temporal stochastic simulation of fire outbreaks following earthquakes based on GIS[J].Journal of Fire Sciences,2006,24(4):313-339.
[4]李杰,李国强.地震次生火灾预测模型研究[J].中国地震,1992,8(1):76-82.LI JIE,LI GUO-QIANG.A Research on the prediction model of earthquake-aroused fire disaster[J].Earthquake Research in China,1992,8(1):76-82.
[5]赵振东,余世舟,钟江荣.建筑物震后火灾发生与蔓延危险性分析的概率模型[J].地震工程与工程振动,2003,23(4):183-187.ZHAO Z D,YU S Z,ZHONG J R.Probability model for hazard analysis of post-earthquake fire occurrence and spread among buildings[J].Earthquake Engineering and Engineering Vibration,2003,23(4):183-187.
[6]陈素文,李国强.地震次生火灾的研究进展[J].自然灾害学报,2008,17(5):120-126.CHEN S W,LI G Q.Advance in research on secondary fire of earthquake[J].Journal of Natural Disasters,2008,17(5):120-126.
[7]李天祺,赵振东.油气储运系统钢结构设备地震火灾效应研究[J].地震工程与工程振动,2005,25(6):118-121.LI T Q,ZHAO Z D.Steel structure equipment earthquake fire effect research of oil-gas storage and transportation systems[J].Earthquake Engineering and Engineering Vibration,2005,25(6):118-121.
[8]吴波,李惠,马忠诚.钢筋混凝土结构在火灾和低周反复荷载作用下的损伤分析[J].哈尔滨工业大学学报,1997,30(3):7-12.WU B,LI H,MA Z C.Damage analysis of R.C.structures under fire[J].Journal of Harbin University of C.E.&Architecture,1997,30(3):7-12.
[9]陈宏德,张宝红.日本的地震火灾对策[J].国际地震动态,1994(10):22-26.CHEN H D,ZHANG B H.Earthquake fire countermeasures in Japan[J].International Earthquake Research,1994(10):22-26.
[10]EUROCODE2:Design of composite steel and concrete structures[S].Structural Fire Design,Commission of the European Communities,Brussels,2002.
[11]MOSS P J,DHAKAL R P,BONG M W.Design of steel portal frame buildings for fire safety[J].Journal of Constructional Steel Research,2009,65(5):1216-1224.
[12]CHI K I,CHAN S L,ZHA X X.Nonlinear pre fire and post fire analysis of steel frames[J].Engineering Structures,2008,27(11):1689-1702.
[13]YASSIN M H,BAGCHI A,KODUR V.Numericalmodel for assessing the post-earthquake fire resistance of wood-stud wall[J].Annual Conference-Canadian Society for Civil Engineering,2009:1520-1529.
[14]CORTEA G DELLA,LANDOLFOB R,MAZZOLANI F M.Post-earthquake fire resistance of moment resisting steel frames[J].Fire Safety Journal,2003,38(7):593-612.
[15]CHEN SUWEN,LEEGEORGE C,LI GQ.A study on steel buildings subjected to earthquake and the following fire[C]//PRC-US Earthquake Engineering Forum for Young Researchers Harbin,China,2006.
[16]KODUR VKR,WANG T,CHENG F.Predicting the fire resistance behavior of high strcngth concrete columns[J].Cement&Concrete Composites,2004,26(2):141-153.
[17]HUANG Z H,BURGESS I W,PLANK R J.Three-dimensional analysis of reinforced concrete[J].Journal of Structural Engineering,2009,135(10):1201-1212.
[18]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.
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