簡支梁橋車橋耦合振動基本理論研究.pdf

1、同濟大學碩士學位論文簡支梁橋車橋耦合振動基本理論研究姓名：賈允祥申請學位級別：碩士專業(yè)：橋梁與隧道工程指導教師：吳定俊余華20050301Abstract——————————————————_—_—_—h_————●———’——————————————————————————————————^一ABSTRACTWiththeincreasingapplicationofslenderbridgestructuresandtheincre

2、aseofvehicleloadsandvehiclespeed，thevehiclebridgevibrationquestionarousemoreattentioninengineeringfieldThispaperhasstudiedfurtheraboutthevehiclebridgedynamicresponsecausedbythevariationofbridgestiffness，roadroughnessandv

3、ehiclespeedTheprincipalworkisasfollows：1Inthispaperthepowerbalanceequationsofvehicleandtheexpressionsofthejnteractforcebetweenthebridgeandthevehiclesarededuced2Theroadroughnessissimulated，thenitisappliedintheprogramforve

4、hicle。bridgecouplingvibrationcalculationThisprogramwhichbelongstostaffroomisremarkablyimproved3Accordingtothedifferentformofvehiclestouchingroadsurface，threekindsofvehiclemodelsaresimulated：dual—spring，suspendedrigidbeam

5、andmovingloadThevibrationmechanismisdiscussedandfactorsthatinfluencethevehiclebridgedynamicperformanceareanalyzed：(1)ThevehiclebridgedynamicresponsechangeswithdifferentvehiclemodelsTheresultsshowthatthemovingloadmodelpro

6、ducesthemaxdeflectionwhilethedual—springmodelproducesthemindefection；(2)TheeffectofthebridgestiffnessonthedynamicresponseisdiscussedThedeflectioncalculatedbydifferentwheelbridgemodelisnotSOdifferentwithlargerbridgestiffn

7、ess，andthedifferenceofthecalculateddeflectionisnotablewithsmallerbridgestiffnessAsawholethesmoothnessofthevehicleshaslittletodowiththebridgestiffness(3)TheinfluenceofroadroughnessonthedynamicresponseisanalyzedTheworsethe

8、roadconditionis，thebiggerimpactfactorandvehicleaccelerationareTheinfluenceoftheroadrolJlghnessismuchremarkablethanthatofbridgestiffnessRoadroughnessisthemainexcitationsource(4)Theinfluenceofvehiclespeedanddynamicresponse