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