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1、學(xué)兔兔www.xuetutu.com橋梁建設(shè)2014年第44卷第2期(總第225期)32BridgeConstruction,Vo1.44,No.2,2014(TotallyNo.225)文章編號:1003—4722(2014)02—0032—06多跨混凝土連續(xù)梁橋隔震措施研究許莉,祁皚(福州大學(xué)土木工程學(xué)院,福建福州350108)摘要:采用合適的隔震措施是改善多跨連續(xù)梁橋固定墩承受過大地震力作用的有效方法。以某六跨混凝土連續(xù)梁橋為工程背景,通過有限元軟件ANSYS計算分析,在該橋中間墩處分別設(shè)摩擦擺支座和減震球型支座2種隔震體系,研究2種隔震體系對橋
2、梁地震響應(yīng)的影響規(guī)律。結(jié)果表明:2種隔震措施均能有效地降低順橋向橋墩內(nèi)力和位移,因此隔震體系與抗震體系相比受力更為合理;從支座的豎向承載力和回復(fù)剛度等方面考慮,摩擦擺支座具有顯著的優(yōu)點,因此建議此類連續(xù)梁橋采取隔震措施時采用摩擦擺支座。關(guān)鍵詞:連續(xù)梁橋;隔震措施;減震球型支座;摩擦擺支座;地震響應(yīng);動力分析;有限元法中圖分類號:U448.21;TU352.12文獻標(biāo)志碼:AStudyofSeismicIsolationMeasuresforMulti-SpanConcreteContinuousGirderBridgeXULi,QIA£(Schoolo
3、fCivilEngineering,F(xiàn)uzhouUniversity,F(xiàn)uzhou350108,China)Abstract:Totaketheproperseismicisolationmeasuresforthefixedpiersofmulti—spancon—cretecontinuousgirderbridgeisaneffectivewaytoimprovethepierssubjectedtotheactionofseismicforce.Inthispaper,asix—spanconcretecontinuousgirderbridg
4、ewascitedasanexampleandbymeansofthefiniteelementsoftwareANSYS,twokindsoftheseismicisolationsystemsofthefrictionpendulumbearingsandseismicmitigationsphericalbearingsrespectivelyarrangedontheintermediatepiersofthebridgewerecalculatedandanalyzedandthelawsofinfluencesofthetwokindsof
5、thesystemsontheseismicresponsesofthebridgewerestudied.Theresultsofthestudyindicatethatthetwokindsofthesystemscaneffectivelyreducetheinternalforcesanddis—placementofthepiersinthelongitudinaldirectionofthebridge.Incomparisonwiththeseismicresistantsystem,theforceconditionsoftheseis
6、micisolationsystemaremorereasonableandinconsiderationoftheverticalbearingcapacityandresilientstiffnessofthebearings,thefrictionpendulumbearingshaveobviousadvantageanditisthereforeproposedthatthependulumbear—ingsshouldbeselectedforsuchtypeofthebridgeswheretheseismicisolationmeasu
7、resarere—quiredtobetaken.Keywords:continuousgirderbridge;seismicisolationmeasure;seismicmitigationsphericalbearing;frictionpendulumbearing;seismicresponse;dynamicanalysis;finiteelementmethod1引言的特點,在我國有著廣泛的應(yīng)用。但是對于連續(xù)梁多跨混凝土連續(xù)梁橋具有結(jié)構(gòu)剛度大、變形小橋來說,絕大多數(shù)上部結(jié)構(gòu)的地震作用都是由固定收稿日期:2O13一¨一05收稿日期:福州大
8、學(xué)科技發(fā)展基金(2013一XQ-36);福州市科技計劃項目(2012一G一130)Scienc