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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.Singleboxgirdersmayalsocarrydecksupto30mwide.Forthelo
2、ngerspanbeams,beyondabout50m,theyarepracticallytheonlyfeasibledecksection.Fortheshorterspanstheyareincompetitionwithmostoftheotherdecktypesdiscussedinthisbook.Theadvantagesoftheboxformareprincipallyitshighstructuralefficiency(5.4),whichminimisestheprestressforcerequiredtoresistagivenbendingmoment,an
3、ditsgreattorsionalstrengthwiththecapacitythisgivestore-centreeccentricliveloads,minimisingtheprestressrequiredtocarrythem.Theboxformlendsitselftomanyofthehighlyproductivemethodsofbridgeconstructionthathavebeenprogressivelyrefinedoverthelast50years,suchasprecastsegmentalconstructionwithorwithoutepoxy
4、resininthejoints,balancedcantilevererectioneithercastin-situorcoupledwithprecastsegmentalconstruction,andincrementallaunching(Chapter15).13.2Cast-in-situconstructionofboxes13.2.1GeneralOneofthemaindisadvantagesofboxdecksisthattheyaredifficulttocastin-situduetotheinaccessibilityofthebottomslabandthen
5、eedtoextracttheinternalshutter.Eithertheboxhastobedesignedsothattheentirecrosssectionmaybecastinonecontinuouspour,orthecrosssectionhastobecastinstages.毕业设计外文资料翻译第16页13.2.2CastingthedeckcrosssectioninstagesThemostcommonmethodofbuildingboxdecksinsituistocastthecrosssectioninstages.Either,thebottomsla
6、biscastfirstwiththewebsandtopslabcastinasecondphase,orthewebsandbottomslabconstitutethefirstphase,completedbythetopslab.Whenthebottomslabiscastfirst,theconstructionjointisusuallylocatedjustabovetheslab,givingakickerforthewebformwork,position1inFigure13.1.Ajointinthislocationhasseveraldisadvantageswhic
7、haredescribedin11.7.1Figure13.1AlternativepositionsofconstructionjointAlternatively,thejointmaybeinthebottomslabclosetothewebs,oratthebeginningofthehaunches,position2.Theadvantagesoflocatingthejointinthebot