北江桥成桥状态和施工过程的受力性能分析

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1、ABSTRACTBeijiangRiverBridgeonNewGuiyang—GuangzhouRailwayisdesignedasasteeltrusscable—stayedbridgewithspanarrangement(57．5+109．25+230+l09．25+57．5)m，doublepylons，twocableplanesandtwomaintrusses．whichallowsfourrailwaylines．ConcretedeckiSadoptedinthesegmentsofsidespanandfoursegmentsoftheedg

2、espannexttosidespan，whileorthotropicsteeldeckisadoptedintherestpart．Twolongitudinalbeamsaresetontheinsideoflowerchords．andlongitudinalbeamsandthelowerchordsaleconnectedbyhorizontalKshores．Deckloadistarsportedtocrossbeamsthroughdeck,crossribsandlongitudinalbeams，andthentolowerchordnodes．

3、Thisbridgestructureisfirstlyusedathome．MechanicalbehaviorsofBeijiangRiverBridgeinthefinishedstateandconstructionstatesiSanalyzedinthispaper．MainworkofthispaperiSasfollows：1．SpacefiniteelementmodelofthefullbridgewasestablishedbySPB(SpacePlate．Beam)method．Influencematrixmethodandzero-disp

4、lacementmethodwereadoptedcomprehensivelytodeterminecableforcesunderdeadload，andmechanicalfeathersandstatusofthisbridgeunderbothcabletensionsanddeadloadwereanalyzedatthesametime．Resultsshow：thebridgeisinasmoothlineshapeandmechanicalcondition．2．Themechanicalfeathersofthebridgeunderworst．c

5、aseoflivingloadandthecombinationofmainloadswereresearched．Resultsshowthatthebridgeisstrongenoughtosatisfytherequirementsoftrains’operationsafetyandcomfortableness．3．Basedontheprincipleoffewertimesofstretchingthecablesandbetterstressconditionofthebridgeunderconstruction，forward．iteration

6、methodcombinedwithfinitedifferencemethodwasadoptedtodeterminecabletensileforcesduringconstructionprocess．TheresearchresultsofthispaperprovideevidencefordesignandconstructionofBeijiangRiverBridgeandreferencesforothersimilarstructures．KEYWORDS：railwaycable—stayedbridge，stelltruss，cablefoe

7、ces，analysisofmechanicalfeathers目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．iABSTRACT⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ii第一章绪论⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．11．1国内铁路斜拉桥的发展⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯l1．2铁路钢桁梁斜拉桥特点和问题的提出⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯71．3北江桥的工程概况⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯。91．3．1北江桥的结构特点