簡(jiǎn)支梁橋車(chē)橋耦合振動(dòng)基本理論研究.pdf

1、同濟(jì)大學(xué)碩士學(xué)位論文簡(jiǎn)支梁橋車(chē)橋耦合振動(dòng)基本理論研究姓名：賈允祥申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：橋梁與隧道工程指導(dǎo)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