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1、毕业设计外文资料翻译第20页外文资料原文：13Boxgirders13.1GeneralTheboxgirderisthemostflexiblebridgedeckform.Itcancoverarangeofspansfrom25muptothelargestnon-suspendedconcretedecksbuilt,oftheorderof300m.Singleboxgirdersmayalsocarrydecksupto30mwide.Forthelongerspanbeams,beyondabout50m,theyareprac
2、ticallytheonlyfeasibledecksection.Fortheshorterspanstheyareincompetitionwithmostoftheotherdecktypesdiscussedinthisbook.Theadvantagesoftheboxformareprincipallyitshighstructuralefficiency(5.4),whichminimisestheprestressforcerequiredtoresistagivenbendingmoment,anditsgreattorsi
3、onalstrengthwiththecapacitythisgivestore-centreeccentricliveloads,minimisingtheprestressrequiredtocarrythem.Theboxformlendsitselftomanyofthehighlyproductivemethodsofbridgeconstructionthathavebeenprogressivelyrefinedoverthelast50years,suchasprecastsegmentalconstructionwithor
4、withoutepoxyresininthejoints,balancedcantilevererectioneithercastin-situorcoupledwithprecastsegmentalconstruction,andincrementallaunching(Chapter15).13.2Cast-in-situconstructionofboxes13.2.1GeneralOneofthemaindisadvantagesofboxdecksisthattheyaredifficulttocastin-situduetoth
5、einaccessibilityofthebottomslabandtheneedtoextracttheinternalshutter.Eithertheboxhastobedesignedsothattheentirecrosssectionmaybecastinonecontinuouspour,orthecrosssectionhastobecastinstages.毕业设计外文资料翻译第20页13.2.2CastingthedeckcrosssectioninstagesThemostcommonmethodofbuildingb
6、oxdecksinsituistocastthecrosssectioninstages.Either,thebottomslabiscastfirstwiththewebsandtopslabcastinasecondphase,orthewebsandbottomslabconstitutethefirstphase,completedbythetopslab.Whenthebottomslabiscastfirst,theconstructionjointisusuallylocatedjustabovetheslab,givingakic
7、kerforthewebformwork,position1inFigure13.1.Ajointinthislocationhasseveraldisadvantageswhicharedescribedin11.7.1Figure13.1AlternativepositionsofconstructionjointAlternatively,thejointmaybeinthebottomslabclosetothewebs,oratthebeginningofthehaunches,position2.Theadvantagesofl
8、ocatingthejointinthebottomslabarethatitdoesnotcrossprestressingtendonsorheavyreinforcemen
