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1、第44卷第1期東南大學學報(自然科學版)Vo1.44No.12014年1月JOURNALOFSOUTHEASTUNIVERSITY(NamrMScienceEdition)Jan.2014doi:10.3969/j.issn.1001—0505.2014.01.029板式橡膠支座摩擦滑移抗震性能試驗研究李沖王克海李悅李茜(東南大學交通學院,南京210096)(交通運輸部公路科學研究院,北京100088)摘要:為了研究板式橡膠支座摩擦滑移后橋梁的抗震性能,完成了5個試件在不同豎向荷載作用和往復荷載作用
2、下的擬靜力試驗,分析了支座摩擦滑移前后的滯回曲線、骨架曲線、支座變形、滑移位移、強度和剛度退化規(guī)律以及耗能能力等抗震性能指標.試驗結果表明,加載位移較小時,支座主要發(fā)生彈性剪切變形,滑動位移較小.當支座剪切變形達到73%一110%時,發(fā)生明顯滑移,滑移位移與支座所受的豎向荷載和支座規(guī)格有關.支座與鋼板之間的摩擦系數與施加豎向荷載成反比,摩擦力與豎向荷載成正比,支座加載和卸載剛度基本不變,等效剛度退化明顯,但退化到一定值后基本穩(wěn)定.板式橡膠支座橡膠層厚度的增加會導致支座摩擦耗能性能改變,加載位移相同時
3、,支座自身的剪切變形隨之增大,摩擦滑移位移和摩擦耗能則隨之減?。P鍵詞:板式橡膠支座;摩擦滑移;滑移位移;耗能;剪切變形中圖分類號:U442.5文獻標志碼:A文章編號: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,