桥梁工程专业英语.doc

桥梁工程专业英语.doc

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1、不对称连续钢构桥受力分析Whenbuildingacontinuousgirderbridgeinthemountainareawithruggedterrain,theamountofpierswillincrease.Asaresult,thetotalconstructioncostwillrise.Moreover,ifthecantileverconstructionmethodischosen,theamountofprovisionalanchoragedeviceswillincrease,whichwillalsoar

2、isetheconstructiondifficulties.Inthiscase,acontinuousrigidframebridgeispreferablewithitslargespancapacityanditsconvenienceintheconstructionprocesswhereitrequiresnosystemconversion.Normallyacontinuousrigidframebridgeisarrangedsymmetrically。However,insomecasessuchasanunfav

3、orabletopographicconditionorarestrictednavigationcondition,anunsymmetricalarrangementisusuallyselected.Generally,therearetwokindsofunsymmetricalcontinuousrigidframebridgesregardlessofcurvedones:theonewithunsymmetricallongitudinalspans,andtheonewithpiershavingheightdiffer

4、ences.Andinthepracticalprojects,therearethosewithbothfeaturesmentionedabove.Underloadactionanunsymmetricalcontinuousrigidframebridgewillhaveunsymmetricalinternalforcesanddeformations,whichisdifferentfromsymmetricalones.Therefore,itisnecessarytostudyonunsymmetricalrigidfr

5、amebridge.Basedonprojectofwesternregionaverygoodapplicationexamplesofasymmetriccontinuousrigidframe—theYantouRiverBridgeinSinancountyinGuizhouprovince,ananalysisonunsymmetricalcontinuousrigidframebridgeiscarriedonwiththehelpoffiniteelementprogram.Severalaspectsstudiedint

6、hispaperareasfollows.(1)Setupafiniteelementmodelofacontinuousrigidframebridgewithunsymmetricallongitudinalspans.Keepthethreeparametersofpierofoneside,includingtheheight,thewidthinthelongitudinaldirectionandthespacingofdoublethin-wall,andchangethosethreeparametersoftheoth

7、erside.Thencompareandanalyzetheinternalforceanddeformationofpiersunderloadaction.Bythat,featuresofinternalforceanddeformationofcontinuousrigidframebridgewithbothunsymmetricalspansanddifferentpierheightscanbeacquired.(2)Setupanotherfiniteelementmodel,acontinuousrigidframe

8、bridgewithsymmetricallongitudinalspans.Keeptheheightofpierofoneside,andchangetheheightofpieroftheothers

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