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《風(fēng)障對橋面風(fēng)環(huán)境影響的數(shù)值模擬研究》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、浙江大學(xué)碩士學(xué)位論文風(fēng)障對橋面風(fēng)環(huán)境影響的數(shù)值模擬研究姓名：董香婷申請學(xué)位級別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：樓文娟20070601浙江大學(xué)碩士學(xué)位論文風(fēng)障對橋面風(fēng)環(huán)境影響的數(shù)值模擬研究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浙江大學(xué)碩士學(xué)位
