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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.Singleboxgirdersmayalsocarrydecksupto30mw
2、ide.Forthelongerspanbeams,beyondabout50m,theyarepracticallytheonlyfeasibledecksection.Fortheshorterspanstheyareincompetitionwithmostoftheotherdecktypesdiscussedinthisbook.Theadvantagesoftheboxformareprincipallyitshighstructuralefficiency(5.4),whichminimisestheprestressforcerequiredtoresi
3、stagivenbendingmoment,anditsgreattorsionalstrengthwiththecapacitythisgivestore-centreeccentricliveloads,minimisingtheprestressrequiredtocarrythem.Theboxformlendsitselftomanyofthehighlyproductivemethodsofbridgeconstructionthathavebeenprogressivelyrefinedoverthelast50years,suchasprecastseg
4、mentalconstructionwithorwithoutepoxyresininthejoints,balancedcantilevererectioneithercastin-situorcoupledwithprecastsegmentalconstruction,andincrementallaunching(Chapter15).13.2Cast-in-situconstructionofboxes13.2.1GeneralOneofthemaindisadvantagesofboxdecksisthattheyaredifficulttocastin-s
5、ituduetotheinaccessibilityofthebottomslabandtheneedtoextracttheinternalshutter.Eithertheboxhastobedesignedsothattheentirecrosssectionmaybecastinonecontinuouspour,orthecrosssectionhastobecastinstages.毕业设计外文资料翻译第16页13.2.2CastingthedeckcrosssectioninstagesThemostcommonmethodofbuildingboxde
6、cksinsituistocastthecrosssectioninstages.Either,thebottomslabiscastfirstwiththewebsandtopslabcastinasecondphase,orthewebsandbottomslabconstitutethefirstphase,completedbythetopslab.Whenthebottomslabiscastfirst,theconstructionjointisusuallylocatedjustabovetheslab,givingakickerforthewebformwo
7、rk,position1inFigure13.1.Ajointinthislocationhasseveraldisadvantageswhicharedescribedin11.7.1Figure13.1AlternativepositionsofconstructionjointAlternatively,thejointmaybeinthebottomslabclosetothewebs,oratthebeginningofthehaunches,position2.Theadvantagesoflocatingthejointinthebot
