无砟轨道桥上无缝道岔交叉渡线纵向力研究

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1、西南交通大学硕士学位论文无砟轨道桥上无缝道岔交叉渡线纵向力研究姓名：张世杰申请学位级别：硕士专业：道路与铁道工程指导教师：王平20080601西南交通大学硕士研究生学位论文第1I页AbstractBothseamlessturnoutandcontinuouslyweldedrail(CWR)trackonbridgearekeytechniquesforhighspeedrailwayandheavyhaulrailwaytostrengthentrackstructure．Themechanicalmechanism

2、sofbothseamlessturnoutandCWRtrackonbridgeareverycomplexandtheyhavealwaysbeenthefocalpointsanddifficultypointsofrailwaymodernizationtechniqueresearch．Becauseoftherestrictionoflandformorenvironmentalprotection，seamlessturnoutwillbeunavoidablylaidonbridgeinnewly-bui

3、ltrailwayorcityelevatedrailway．seamlessturnoutscissorscrossingisoneoftrackequipmentmadeengineblockandrollingstockfromoneroutecrossovertoanotherroute，canshortenstationandyardareaandlength，andabroadapplicationintracktrafficofcityandrailway．Inthispaper，accordingtoth

4、erouteofHainaneast-looptheseamlessturnoutscissorscrossingonballastlessbridge，using60kg／mrail，No．12fixedfrog．and5．0mbetweencentersofrailsscissorscrossingstructuredisposaloncontinuous．beam，themodeisestablished．by．adopting．finite．elementmethod(FEM)．Theformofstructur

5、eandworkingcharacteristicaremorecomlex，theaccountdateoflongitudinalforceanddisplacementwasnotseen，thereisnoengineeringexperienceofseamlessturnoutonbridgeinChina，andtherelatedtheoryresearchisalsoveryfew．Inordertoguidethefutureengineeringpracticewithscientifictheor

6、y,thispaperfinishedsomepioneertheoryresearchesasfollows：(1)Aimingatballastlesstrack，afiniteelementmechanicsmodelWasestablishedwhichcancalculatethetensileandcompressiveforceanddisplacementofweldedturnoutscissorscrossingonbridge．Inthemodel，therails··sleeper··slab··

7、bridge·-pierwereconsideredasasystem；steelrailandsleeperissimplifiedtobeamelements；ballastbedslabandbridgeissolidelements；pierorabutmentinfixedbearingwasconsideredaslinearspringelement；longitudinalballastresistance，spacerpiecesresistanceandspacingironblockswerecon

8、sideredasnonlinearspringelement．themodelwereestablishedbyANSYS．accordingtoNewton—iterativeruletosolve．(2)Thecalculationmodeloftensileandcompressiveforceanddisp