桥梁工程boxgirders箱梁大学毕业论文外文文献翻译及原文(20180518213542)

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1、毕业设计（论文）外文文献翻译文献、资料中文题目：箱$文献、资料英文题目:Boxgirders文献、资料来源：文献、资料发表（出版）日期：院（部）：专业：班级：姓名：学号:指导教师:外文资料原文:13Boxgirders13.1GeneralTheboxgirderisthemostflexiblebridgedeckform.Itcancoverarangeofspansfrom25muptothelargestnon-suspendedconcretedecksbuilt,oftheordero

2、f30()m.Singleboxgirdersmayalsocarrydecksupto30mwide.Forthelongerspanbeams,beyondabout50m，theyarepracticallytheonlyfeasibledecksection.Fortheshorterspanstheyareincompetitionwithmostoftheotherdecktypesdiscussedinthisbook.Theadvantagesoftheboxformareprin

3、cipallyitshighstructuralefficiency(5.4),whichminimisestheprestressforcerequiredtoresistagivenbendingmoment，anditsgreattorsionalstrengthwiththecapacitythisgivestore-centreeccentricliveloads，minimisingtheprestressrequiredtocarrythem.Theboxformlendsitsel

4、ftomanyofthehighlyproductivemethodsofbridgeconstructionthathavebeenprogressivelyrefinedoverthelast50years,suchasprecastsegmentalconstructionwithorwithoutepoxyresininthejoints，balancedcantilevererectioneithercastin-situorcoupledwithprecastsegmentalcons

5、truction，andincrementallaunching(Chapter15).13.2Cast-in-situconstructionofboxes13.2.1GeneralOneofthemaindisadvantagesofboxdecksisthattheyaredifficulttocastin-situduetotheinaccessibilityofthebottomslabandtheneedtoextracttheinternalshutter.Eithertheboxh

6、astobedesignedsothattheentirecrosssectionmaybecastinonecontinuouspour,orthecrosssectionhastobecastinstages.13.2.1CastingthedeckcrosssectioninstagesThemostcommonmethodofbuildingboxdecksinsituistocastthecrosssectioninstages.Either,thebottomslabiscastfir

7、stwiththewebsandtopslabcastinasecondphase,orthewebsandbottomslabconstitutethefirstphase,completedbythetopslab.Whenthebottomslabiscastfirst，theconstructionjointisusuallylocatedjustabovetheslab，givingakickerforthewebformwork，position1inFigure13.1.Ajoint

8、inthislocationhasseveraldisadvantageswhicharedescribedin11.7.1Figure13.1AlternativepositionsofconstructionjointAlternatively,thejointmaybeinthebottomslabclosetothewebs，oratthebeginningofthehaunches,position2.Theadvantagesoflocatingthejointinth