基于ADINA的桥梁气动导数数值模拟

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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