基于ADINA的桥梁气动导数数值模拟

基于ADINA的桥梁气动导数数值模拟

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页数:84页

时间:2019-05-11

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1、西南交通大学硕士学位论文基于ADINA的桥梁气动导数数值模拟姓名:欧志峰申请学位级别:硕士专业:桥梁与隧道工程指导教师:廖海黎20070601西南交通大学硕士研究生学位论文第1I页AbstractWitllthespanoflong—spanbridgesisbecominglonger,thestiffnessanddampingratioofstmcto北sdecreasedearlyandthencriticalfluttervelocityfallsaccordingly.Soflutterhasbeenthemostimportantprobleminthed

2、esignoflong-spanbridges.Withtheincreaseofcomputationalspeedinrecantyears,numericalexperimentsviaComputationalFluidDynamicsarefastimprovedasalleffectiveenmplement,althoughitstill咖’tcompletelyreplacewindtunnelinvestigations.Majorcontentsofthethesisincludethefollowing:(1)Theforcedoscillatin

3、gprocedureisusedtodeterminatetheflutterderivativesoftheidealflatplatewiththediscretizationmethodoffinitevolumemethed(FVM)byusingADINA.TheresultsaleclosetotheTheodorsen'stheoreticsolutions.(2)FlowfieldaroundtheGreatBeltEastBridgedeckissimulatedbyllsingforcedvibrationpmced哪e.Theflutter捌Vat

4、iVesal℃ⅨUaetedfromaerodymmicforces.ThecomputedaerodynamicderivativesoftheGreatBeltEastBridgearecomparedwithresultsfromsectionmodeltestsinwindtunnelandgoodagreementisfound.Also,smalldeviationisshownoncriticalfluttervelocityofGreatBeltEastBridgebasedonflutterderivativesobtainedfromtheprese

5、ntstudyandfromwindtunneltests.Theavailabilityofpresentapproachesanditsapplicabilitytoengineeringarcproved.(3)Theaerodynamicdevicesusedtoimprovebridgeflutterstabilityundersmoothflowarediscussedbymea.1强ofnumericalmethods.TheflutterderivativesandcriticalfluttervelocityofbridgegirderCROSS—se

6、ctionwithverticalstabilizerarecompaⅢ1withresultsoforiginalbfidgegirdercross-Section.Itisshownthattheverticalstabilizeriseffectivetoincreasetheflutterstability.Comparingthepresentnumericalapp∞∽heswimwindtunneltests,itisshown西南交通大学硕士研究生学位论文第m页thatthepresentstudydoesn'trequireexpensivewindt

7、unnelsandalsoneedn'tpreparethescaledtestingmodels,whilecastingoffdifficultiesandhigheroperatingcosts.Therefore,acombinationofnumericalapproacheswithwindtunneltestswillmakeitpossibletosuccessfullyevaluatetheflutterstabilityofbridgegirdercross-section.KeyWords:flutterderiva

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