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1、第40卷，第6期公路工程Vo1．40，No．62015年12月HighwayEngineeringDec．，2015基于車橋耦合振動(dòng)的大跨度斜拉橋沖擊系數(shù)研究王貴春，陳衛(wèi)麗(1．鄭州大學(xué)土木工程學(xué)院，河南鄭州450001；2．河南省建筑科學(xué)研究院有限公司，河南鄭州450001)[摘要]考慮車輛荷載對(duì)橋梁結(jié)構(gòu)的沖擊作用是現(xiàn)代橋梁設(shè)計(jì)中的重要內(nèi)容之一。為了研究橋梁結(jié)構(gòu)在車橋耦合振動(dòng)情況下所受到的沖擊效應(yīng)，以潤(rùn)揚(yáng)長(zhǎng)江大橋北漢橋主橋?yàn)槔M(jìn)行了分析。分別利用有限元法和動(dòng)力平衡原理建立了橋梁結(jié)構(gòu)動(dòng)力分析模型和車輛的多剛體動(dòng)力學(xué)模型。以橋面不平順為激振源，借助于車輛和橋梁兩個(gè)子系統(tǒng)之間力和位移的協(xié)調(diào)條件
2、，用Newmark—p法求解車橋系統(tǒng)的振動(dòng)微分方程，分析橋梁結(jié)構(gòu)的動(dòng)力響應(yīng)和沖擊系數(shù)。計(jì)算結(jié)果表明，橋面不平順對(duì)橋梁沖擊系數(shù)有明顯的影響，車速的增加使剪力沖擊系數(shù)顯著增大，車重的增加使各種沖擊系數(shù)均有所降低，車輛運(yùn)行路線與橋梁中心線距離的增大使扭矩沖擊系數(shù)增加。[關(guān)鍵詞]斜拉橋；有限元法；車橋耦合振動(dòng)；沖擊系數(shù)[中圖分類號(hào)]u448．27[文獻(xiàn)標(biāo)識(shí)碼]A[文章編號(hào)】1674—0610(2015)O6—0l19一O6TheStudyontheImpactFactor’ofHighwayCable-stayedBridgewithLongSpanontheBasisofVehicle-brid
3、geCoupledVibrationWANGGuichun，CHENWeili(1．SchoolofCivilEngineering，ZhengzhouUniversity，Zhengzhou，Henan450001，China；2．HenanProvinceArchitectureScienceInstituteCooperationLtd．，Zhengzhou，Henan450001，China)[Abstract]Itisimportantcontenttoconsidertheeffectsofvehicleontheimpactfactorofbridgestructureinm
4、odernbridgedesign．ThenorthbranchbridgeofRun-YangYangtzeRiverbridgeistakenasanexampletoinvestigatetheimpacteffectstowhichthebridgestructureissubjectedundertheconditionofvehicle-bridgecoupledvibration．Thedynamicanalyticalmodelofbridgestructureandmulti—rigid·bodydynamicmodelarerespectivelyestablished
5、accordingtofiniteelementmethodanddynamicequilib—riumprinciple．Thebridgesurfaceroughnessistakenasexcitationsourceandtheconditionsofdisplace—mentandforcecompatibilitybetweenvehicleandbridgesubsystemsareusedduringcalculation．TheNe—wmark—Bmethodisusedtosolvethedifferentialequationsofthetwosubsystemsan
6、dthedynamicrespon-sesofandimpactfactorstothebridgestructurearecalculated．Theresultscalculatedindicatethatthebridgesurfaceroughnesshassignificanteffectonthebridgeimpactfactors；theincrementofvehicleveloc—itymakestheimpactfactorofshearforcesignificantlyincrease；theincrementofvehicleweightmakesallimpa
7、ctfactorsslightlydecrease；theincrementofthedistancebetweenvehiclemovingrouteandbridgecenterlinemakestheimpactfactoroftorsionalmomentincrease．[Keywords]cable—stayedbridge；finiteelementmethod；vehicle·bridgecoupledv
