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1、中国科技论文在线http://www.paper.edu.cn#空冷支架结构体系抗震性能试验研究*白国良，李祥翔，樊金承，秦朝刚（西安建筑科技大学土木工程学院，西安710055）5摘要：为进行空冷支架结构体系的抗震性能研究，截取原型结构的1/4，按照1/8缩尺比建立试验模型，通过对模型结构输入不同峰值加速度的El-centro地震波进行拟动力试验，之后进行拟静力试验至结构最终破坏。观察试验模型加载全过程，分析模型结构的破坏过程和构件的受力特点，得到不同加载工况下模型的时程曲线、荷载-位移滞回曲线，进而分析结10构的刚度退化、滞回耗能、结构变形及构件承载能力。试验结果表明：该结构是竖向刚度
2、和质量分布严重不均匀的竖向混合结构，柱顶节点连接部位是结构薄弱部位；结构满足侧移限值要求，但绝对位移较大，和空冷支架结构相连的管道设计时应予以考虑。在弹塑性阶段，由于结构层间位移过大，管柱设计时的重力二阶效应不容忽视。关键词：空冷支架结构体系；拟动力试验；拟静力试验；时程分析；滞回曲线；抗震性能15中图分类号：TU398.9Experimentalstudyonseismicperformanceofair-cooledsupportsystemBAIGuoliang,LIXiangxiang,FANJincheng,QINChaogang20(SchoolofCivilEngineer
3、ing,Xi'anUniversityofArchitecture&Technology,Xi'an710055,China)Abstract:Inordertostudytheseismicperformanceoftheair-cooledsupportstructuresystem,the1/4oftheprototypestructurewasselected,thenthe1/8scaledexperimentalmodelwasconstructed.Thepseudo-dynamictestofthemodelstructurewascarriedoutbyimportin
4、gtheEl-centroseismicwaves25withdifferentpeakacceleration,andthepseudo-statictestwascarriedoutuntiltheultimatedamageofthestructure.Theloadingwholeprocessofthetestmodelwasobserved,andthefailureprocessofthemodelstructureandthestresscharacteristicsofthestructurewereanalyzed.Thecurvesofthemodelunderdi
5、fferentloadingconditionswereobtained,suchasthetime-historycurvesandseismicshear-displacementhysteresiscurves,thenthestiffnessdegradation,hystereticenergydissipation,30structuraldeformationandbearingcapacityofthecomponentswereanalyzed.Thetestresultsshowthat:thestructureisaverticalmixingstructurewi
6、thsevereunevendistributionofstiffnessandmass,andthejointsofthecolumntopnodeareweakpartsofthestructure.Thestructuresatisfiestherequirementoflateralshiftlimit,buttheabsolutedisplacementislarger,andshouldbeconsideredinthepipingdesignconnectedwithair-cooledsupportstructuresystem.Intheelastoplasticsta
7、ge,dueto35theexcessivedisplacementbetweenthestructurelayers,thesecondordereffectsofgravitycannotbeignoredinthedesignofreinforcedconcretetubularcolumn.Keywords:air-cooledsupportstructuresystem;pseudo-dynamictest;quasi-s
