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时间:2017-12-08
《板式橡胶支座摩擦滑移抗震性能试验研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第44卷第1期东南大学学报(自然科学版)Vo1.44No.12014年1月JOURNALOFSOUTHEASTUNIVERSITY(NamrMScienceEdition)Jan.2014doi:10.3969/j.issn.1001—0505.2014.01.029板式橡胶支座摩擦滑移抗震性能试验研究李冲王克海李悦李茜(东南大学交通学院,南京210096)(交通运输部公路科学研究院,北京100088)摘要:为了研究板式橡胶支座摩擦滑移后桥梁的抗震性能,完成了5个试件在不同竖向荷载作用和往复荷载作用
2、下的拟静力试验,分析了支座摩擦滑移前后的滞回曲线、骨架曲线、支座变形、滑移位移、强度和刚度退化规律以及耗能能力等抗震性能指标.试验结果表明,加载位移较小时,支座主要发生弹性剪切变形,滑动位移较小.当支座剪切变形达到73%一110%时,发生明显滑移,滑移位移与支座所受的竖向荷载和支座规格有关.支座与钢板之间的摩擦系数与施加竖向荷载成反比,摩擦力与竖向荷载成正比,支座加载和卸载刚度基本不变,等效刚度退化明显,但退化到一定值后基本稳定.板式橡胶支座橡胶层厚度的增加会导致支座摩擦耗能性能改变,加载位移相同时
3、,支座自身的剪切变形随之增大,摩擦滑移位移和摩擦耗能则随之减小.关键词:板式橡胶支座;摩擦滑移;滑移位移;耗能;剪切变形中图分类号:U442.5文献标志码:A文章编号:1001—0505(2014)01-0162-06ExperimentalstudyonseismicperformanceoflaminatedrubberbearingswithfrictionslippingLiChongWangKehaiLiYueLiQian(SchoolofTransportation,SourestUni
4、versity,Nanjing210096,China)(ResearchInstituteofHighwayofMinistryofCommunications,Beijing100088,China)Abstract:Toinvestigatetheseismicbehaviorsofthelaminatedrubberbearingwithfrictionslipping,aseriesofexperimentsoffivespecimenssubjectedtopseudo—staticte
5、stsunderdifferentverticalloadsandreciprocatingloadswereconducted.Theforce—displacementhystereticcurve,skeletoncurve,deformation,slippingdisplacement,degradationofstrengthandstiffness,andtheenergydissipationcapacitybeforeandafterfrictionslippingwereanal
6、yzed.Theexperimentalresultsshowthatwhentheloaddisplacementissmall,theelasticsheardeformationofbearingsispredominantandtheslip-pingdisplacementissmal1.Whenthebearingsheardeformationreaches73%to110%,slippingdis—placementisobviousanditisrelatedtothevertic
7、alloadandthetypeofbearings.Thefrictioncoef-ficientbetweenthebearingandthesteelplateisinverselyproportionaltotheappliedverticalload,whilethefrictionforceisproportionaltotheverticalload.Theuploadingandunloadingofbearingareessentiallyunchanged.Thebearinge
8、quivalentstiffnessdegradationisobvious;butafterthedeg—radationreachesacertainvalue,theequivalentstiffnessispronetostability.Theincreaseoftherub-berlayerthicknesscanchangefrictionenergydissipation,Whentheloadingdisplacementisequiva—lent,
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