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1、第29卷第11期2012年11月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentV01.29No.11NOV.2012doi:10.3969/j.issn.1002—0268.2012.11.013輸入地震動(dòng)維數(shù)對(duì)FPB隔震曲線橋地震反應(yīng)的影響夏修身1’-,王?;?,陳興沖1,2(1.蘭州交通大學(xué)甘肅省道路橋梁與地下工程重點(diǎn)實(shí)驗(yàn)室,甘肅蘭州730070;2.蘭州交通大學(xué)土木工程學(xué)院,甘肅蘭州730070;3.衡水寶力工程橡膠有限公司,河北衡水053000)摘要:為了研究摩擦擺支座隔震
2、曲線橋梁地震反應(yīng)的空間耦合效應(yīng),分析了輸入地震動(dòng)維數(shù)對(duì)摩擦擺支座隔震曲線橋梁地震反應(yīng)的影響?;诳臻g有限元方法,采用能考慮動(dòng)軸力影響的多維耦合FPB恢復(fù)力模型,以一座2聯(lián)6跨的預(yù)應(yīng)力混凝土連續(xù)箱梁橋?yàn)槔斎?條強(qiáng)震記錄,分別進(jìn)行了一維、二維及三維地震動(dòng)下的非線性時(shí)程反應(yīng)分析及其對(duì)比分析。結(jié)果表明:輸入地震動(dòng)維數(shù)引起的耦合效應(yīng)對(duì)隔震曲線橋梁的地震反應(yīng)有重要影響;輸入地震維數(shù)對(duì)支座的力一位移滯回曲線形狀有較大影響;FPB隔震曲線橋的支座位移大小與輸入地震動(dòng)的維數(shù)有關(guān)。關(guān)鍵詞:橋梁工程;曲線橋梁;空間有限元;耦合效應(yīng);輸入地震動(dòng);摩擦擺支座;地震反應(yīng)中圖分類號(hào)
3、:U442.5+5文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1002—0268(2012)11—0069—06EffectofInputGroundMotionDimensiononSeismicResponseofFPBIsolationCurvedBridgeXIAXiushenl?,WANGXihui3,CHENXingchon91,2(1.KeyLaboratoryofRoad,BridgeandUndergroundEngineeringofGansuProvince,LanzhouJiaotongUniversity,LanzhouGansu730070,Chi
4、na;2.SchoolofCivilEngineering,LanzhouJiaotongUniversity,LanzhouGansu730070,China;3.HengshuiBaoliEngineeringRubberCo.,Ltd.,HengshuiHebei053000,China)Abstract:Inordertostudythe3Dcouplingeffectcausedbyseismicresponseofisolationcurvedbridgewithfrictionpendulumbearings,theeffectofinput
5、groundmotiondimensiononseismicresponseofFPBisolationcurvedbridgewasanalyzed.Basedonthe3Dfiniteelementmethod,takingasix—spancurvedPCcontinousboxgirderbridgewithtwounionsforexampleandinputingthreestrongmotionrecords,nonlineartime。historyseismicresponseunder1D,2Dand3Dinputgroundmotio
6、nswereanalysedandcomparedbyadoptingthemulti—directionalcoupledrestoringforcemodelofFPBconsideringtheactionofaxialforce.Seismicresponseof3Dearthquakewascomparedwiththeresultofunidirectionalandbi—dimensionalearthquake.Theresultsshowthat(1)thecouplingeffectcausedbydimensionofinputgro
7、undmotionhasconsiderableeffectontheseismicresponseofFPBisolationcurvedbridge;(2)theeffectofdimensionofinputgroundmotionontheforce-displacementhysteresiscurveofbearingisgreat;(3)themagnitudeofbearingdisplacementrelatestothedimensionofinputgroundmotion.Keywords:bridgeengineering;cur
8、vedbridge;3Dfiniteelement;couplin