资源描述：
《列车-轨道-地道桥时变系统振动分析》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、TrainDerailmentonBridgesandPreventiveMeasures*SupportedbytheNationalNaturalScienceFoundationofChina(No.50078006)andFoundationoftheScienceandTechnologyDepartmentoftheRailwayBureauofChina(No.2001G029,No.2003G043)ZHOUZhihui,XIANGJun&ZENGQingyuan(SchoolofCivilEngineeringandArchitect
2、ure,CentralSouthUniversity,Changsha410075,Hu’nan,China)Abstract:Atpresent,thesafetyofmovingtrainonbridgeisevaluatedbymeansofthecriterionofderailmentcoefficientQ/Pandwheelloadreductionrate△P/P0.However,testresultsindicatethattrainderailmentcannotbewelljudgedwithcurrentevaluationc
3、riterionforderailment.Comparethederailmentpropertiesonlineswiththoseonbridges,itcanbeseenthatthemechanismoftrainderailmentonlinesisconsistentwiththatonbridges,whichisthelossofthelateralmovementstabilityofthetrainbridge(ortrack)system.Therefore,thetheoryofrandomenergyanalysisfort
4、rainderailmentusedtoanalyzederailmentonlinescanbeusedtoanalyzederailmentonbridges.Usingthistheory,fourcasesoftrainderailmentarecalculated,andthecalculatedresultscorrespondtotheactuallyoccurringaccidents.Byinvestigatingthepropertyoflateralrigidityofthebridgesonwhichderailmentever
5、happened,itcanbefoundthatthescarcityofbridgelateralrigidityisadominantcauseresultinginderailmentonbridges.Thefundamentalapproachtopreventderailmentonbridgesistomakethebridgelateralrigiditysatisfythesafetyrequirementofmovingtrain.Fortheexistingbridgeonwhichderailmentmayhappen,rei
6、nforcingmeasuresmaybetakentoincreasethebridgelateralrigidity,andforthebridgestobedesignedandbuilt,thelimitvalueofbridgelateralrigiditymaybeestablished,withwhichderailmentcanbeprevented.Calculatedresultsmanifestthatthesemeasurestoincreasethebridgelateralrigidityareeffectiveforder
7、ailmentprevention.Keywords:derailment;bridgelateralrigidity;preventivemeasures;energyanalysis1IntroductionWiththelaunchofthespeed-upcampaignofChineserailways,theoperationspeedofthefreighttrainshasincreasedfrom50-60km·h-1upto70-80km·h-1.Butatthesametime,moreandmorederailmentaccid
8、entstookplace,andsomeofthesederailmentshappened
