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1、EXPERIMENTALANDNUMERICALMODALANALYSISOFACONCRETEHIGHSPEEDTRAINRAILWAYBRIDGEJ.Maeck,G.DeRoeckDepartmentofCivilEngineering,DivisionofStructuralMechanics,K.U.Leuven,W.deCroylaan2,B-3001Heverlee,BelgiumAbstractTraininducedvibrationsareamajorenvironmentalconcernbothinEuropeandChina.Besidestheeffec
2、tofvibrationsduetopassengerandfreighttrainsandsubwaysatrelativelylowspeed,thestudyofthevibrationalimpactofhighspeedtrainsisofhighinterest.InBelgium,forexample,newhighspeedtrainlinesconnectBrusselswithParisandLondon,whileextensionstoAmsterdamandColognearepresentlyunderconstruction.InChina,this
3、problemwillbecomeequallyimportantinthenearfuture,asahighspeedtrainconnectionisplannedbetweenBeijingandShanghai.Thepartnersinthisresearchprojectareinvolvedinthedevelopmentofnumericalmodelstopredicttrafficinducedvibrations.Thedevelopment,validationandpracticaluseofthesemodelsrelyoninsituvibrati
4、onmeasurements.Apreliminarymeasurementcampaignwasundertakenonahighspeedtrainbridge,withsensorsonthebridgeaswellasontherails,tobeabletogetmoreinsightinforcetransferfromtraintoconstruction.Keywords:highspeedtrain,dynamictesting,modalanalysisIntroductionTheconstructionunderconsiderationisarailwa
5、ybridgeforthehighspeedtrainbetweenParisandBrussels.ThebridgeissituatedneartheBelgianvillageAntoing,closetotheBelgian-Frenchborder.Thetotalbridgeconsistsofsuccessivelyfiveprestressedconcretebridgesofeach50mspan,amixedsteel-concretebowstringbridge,whichisbuiltoverariver,andalast50mspanconcreteb
6、ridge.Thebridgetestsandsimulationscanbesituatedinabilateralresearchprogram(BIL98/09)betweentheBelgianuniversitiesK.U.LeuvenandV.U.Brussel,andtheNorthernJiaotongUniversity,Beijing,China.Aimoftheprogramistostudythetrain-structureinteractionandthevibrationsinducedintheenvironment.FiniteElementMo
7、delAcompletemodalanalysisofthefirst50spanbridgeisusedasstartingpointfortheexperimentalsurvey.FromsymmetryconsiderationsonlyhalfaspanismodeledinthefiniteelementpackageAnsys[2].Eightnodedbrickelementsareused,threetranslationaldegreesoffreedomat
