风障对桥面风环境影响的数值模拟研究

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1、浙江大学硕士学位论文风障对桥面风环境影响的数值模拟研究姓名：董香婷申请学位级别：硕士专业：结构工程指导教师：楼文娟20070601浙江大学硕士学位论文风障对桥面风环境影响的数值模拟研究AbstractCrosswindmaycausetrafficaccidentssuchasvehiclesideslipandovertruning，especiallywhenrunningonlong·spanbridges．Theproblemsofwindinducedtrafficsafetyarebecomingmoreseriousdu

2、etothefactorsofthealtitudeofthebridgefloorabovetheseelevelandflowoverstructures．Therearemanyreportsofcrosswindinducedaccidentswhichmaycauseheavytrafficjams．Theproblemsoftrafficsafetyundercrosswindarereceivingincreasingconcerning．Windbarrierisamainmethodtoassuretrafficsa

3、fety，especiallyunderstrongcrosswind．ComputationalFluidDynamicsisanewsubjectoriginatedfromabout40yearsago，whichhavebeenappliedinlotsofre：gonsinover10years．Inthisthesis，onthebasisofCFDtheories，relyingonstrongmodel—buildingandanalysisplatformofFLUENT．numericalsimulationisc

4、arriedouttoinvestigatetheinfluenceofwindbarrierOnwindenviromentabovethebridgefloor．Firstlynumericalsimulationsofthewindenvironmentonthebridgefloorundercrosswindwithoutwindbarrier,withfullwindbarrierandwithlocalwindbarrierareperformedtoanalysetheeffectsofthewindbarrieron

5、thewindenvironmentonthebridgefloor．Thenthecriticalwindspeedsofsafetydrivingconcerningfourtypicalvehiclesarecalculatedconsideringwindspeeds，vehicledimensions，roadsurfaceconditionsandvehiclespeedsandanalysisofeffectsofthefullwindbarrierandlocalwindbarrierontrafficsafetyof

6、variousvehiclesareperformed．Finally3DmodelsoftrainsundercrosswindwithandwithoutwindbarrierarebuiltbaseontheaccidentoftrainoverturninginSinkiang．Fromthecalculationresultsof3Dturbulenceflowovertrains，pressuredistribution，pathlinesandaerodynamicforcesofmodeltrainsareanalyz

7、edandobtained．Thenthederailingcoefficientandrollingcoefficientwhichareusedtoevaluatethestabilityoftrainsundercrosswindarederivedandtheeffectsofthewindbarrierontra伍Csafetyoftrainsarediscussed．Theresearchachievementsinthisthesismusthaveimportantreferentialsignificanceandp

8、racticalvaluestoassuretrafficsafety．Keywords：crosswind；numericalsimulation；trafficsafety；windbarrierII浙江大学硕士学位