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1、西南交通大学本科毕业设计（论文）第II页西南交通大学本科毕业设计（论文）外文资料翻译年级:学号:姓名:专业:指导老师:2013年6月毕业设计外文资料翻译第16页外文资料原文：13Boxgirders13.1GeneralTheboxgirderisthemostflexiblebridgedeckform.Itcancoverarangeofspansfrom25muptothelargestnon-suspendedconcretedecksbuilt,oftheorderof300m.Singleboxgir
2、dersmayalsocarrydecksupto30mwide.Forthelongerspanbeams,beyondabout50m,theyarepracticallytheonlyfeasibledecksection.Fortheshorterspanstheyareincompetitionwithmostoftheotherdecktypesdiscussedinthisbook.Theadvantagesoftheboxformareprincipallyitshighstructuralef
3、ficiency(5.4),whichminimisestheprestressforcerequiredtoresistagivenbendingmoment,anditsgreattorsionalstrengthwiththecapacitythisgivestore-centreeccentricliveloads,minimisingtheprestressrequiredtocarrythem.Theboxformlendsitselftomanyofthehighlyproductivemethod
4、sofbridgeconstructionthathavebeenprogressivelyrefinedoverthelast50years,suchasprecastsegmentalconstructionwithorwithoutepoxyresininthejoints,balancedcantilevererectioneithercastin-situorcoupledwithprecastsegmentalconstruction,andincrementallaunching(Chapter15
5、).13.2Cast-in-situconstructionofboxes13.2.1GeneralOneofthemaindisadvantagesofboxdecksisthattheyaredifficulttocastin-situduetotheinaccessibilityofthebottomslabandtheneedtoextracttheinternalshutter.Eithertheboxhastobedesignedsothattheentirecrosssectionmaybecast
6、inonecontinuouspour,orthecrosssectionhastobecastinstages.毕业设计外文资料翻译第16页13.2.2CastingthedeckcrosssectioninstagesThemostcommonmethodofbuildingboxdecksinsituistocastthecrosssectioninstages.Either,thebottomslabiscastfirstwiththewebsandtopslabcastinasecondphase,or
7、thewebsandbottomslabconstitutethefirstphase,completedbythetopslab.Whenthebottomslabiscastfirst,theconstructionjointisusuallylocatedjustabovetheslab,givingakickerforthewebformwork,position1inFigure13.1.Ajointinthislocationhasseveraldisadvantageswhicharedescribe
8、din11.7.1Figure13.1AlternativepositionsofconstructionjointAlternatively,thejointmaybeinthebottomslabclosetothewebs,oratthebeginningofthehaunches,position2.Theadvantagesoflocatingthejointinthebot
