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时间:2019-02-04
《火灾后型钢混凝土平面框架抗震性能有限元分析》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第29卷第3期北京建筑工程学院学报V0l_29No.32013年9月JournalofBeijingUniversityofCivilEngineeringandArchitectureSep.2013文章编号:1004—6011(2013)03—0035—05火灾后型钢混凝土平面框架抗震性能有限元分析谢福娣,武志鑫,刘栋栋(北京建筑大学土木与交通工程学院,北京100044)摘要:建筑火灾的频繁发生给人们的生命及财产安全带来的危害越来越大,建筑结构抗火性能研究已成为建筑结构安全分析领域的一个重要课题.针对火灾后型钢混凝土柱一型钢混凝土梁一钢筋混凝土楼板单层单跨组合平面框架的抗震性能进行了研
2、究,运用有限元分析软件ABAQUS建立了模型,考虑受火时间、柱轴压比和梁跨中荷载等因素对其的影响,研究了火灾后型钢混凝土框架的滞回曲线和骨架曲线,并在此基础上分析了各参数对火灾后型钢混凝土框架延性和耗能方面的影响.通过分析可知在相同轴压比和相同梁跨中荷栽的情况下,受火时间越短滞回曲线越丰满,亦即抗震性能越好;在相同受火时间的情况下,轴压比越小滞回曲线越丰满;而梁跨中荷载大小变化对滞回曲线影响较小.且在最不利的情况下,延性系数为3.:53,等效粘滞阻尼系数为0.24,说明型钢混凝土框架结构具有的良好的延性和抗震性能.关键词:火灾后;型钢混凝土;组合框架;有限元分析;抗震性能;参数分析中图分类
3、号:TU398;TU311.3文献标志码:AAnti-SeismicPerformanceFiniteElementAnalysisofSteelReinforcedConcreteFrameafterFireXieFudi,WuZhixin,LiuDongdong(SchoolofCivilEngineeringandArchitecture,BeijingUniversityofCivilEngineeringandArchitecture,Beijing100044)Abstract:Withthefrequentoccurrenceofbuildingfire,theharmtop
4、eople’Slifeandpropertyisgrowing.ResearchesonfireresistanceperformancehavebecI9meanimportanttopicinthefieldofstructuralsafetyanalysis.Thispaperfocusesonthestudiesofthemechanicalpropertiesoftheplaneframeafterfirewhichiscomposedbythesteelreinforcedconcretecolumn,steelreinforcedconcretebeamandreinforc
5、edconcretefloorslab.ByusingthesoftwareofABAQUS,thehystereticcurvesandskeletoncurvesofthesteelreinforcedconcreteframeafterfireareobtainled.Theef_fectsofthefactorssuchasthefiretime,thecolumnaxialcompressionratioandbeamloadareanalyzedandtheeffectsontheductilityandthedissipationofthesteelreinforcedcon
6、creteframeafterfirearefurtherdiscussed.Anditisobtainedthatwiththesameaxialcompressionratioandbeammid-spanload,theshorterthefiretimeis,themoreplumptheCurveis.Andunderthesamefiretimethesmallertheaxialcompressionratiois,themoreplumpthecurveis.Whatismore,thesizeofbeammid-spanloadhassmallerinfluenceonh
7、ysteresiscurve.Undertheworstconditioniftheductilityfactor。is3.53andequivalentviscousdampingcoefficientis0.24,thesteelreinforcedconcreteframestructurehasgoodductilityandanti-seismicperformance.Keywords:afterfire;S
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