跨巢湖大桥分离式双箱PK断面结合梁设计

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1、桥梁建设2015年第45卷第1期(总第230期)BridgeConstruction，Vo1．45，No．1，2015(TotallyNo．230)91文章编号：1003—4722(2015)01—0091—06跨巢湖大桥分离式双箱PK断面结合梁设计常付平，卢永成，李文勃，沈祺(上海市政工程设计研究总院(集团)有限公司，上海200092)摘要：安徽省巢湖市湖光路跨巢湖大桥主桥为独塔双索面混合梁斜拉桥，边跨设2个辅助墩，跨径布置为(40+45+117．5)m+300m。主跨及边跨近塔108．5m范围主梁采用结合梁，梁高3m，全宽37m。结合梁由混凝土桥面

2、板和钢箱梁组成，钢箱梁采用分离式双箱PK断面，单个钢箱梁纵梁顶宽(含风嘴)10．21m，底宽4m。两纵梁之间采用横梁连接，横梁采用工字形断面，间距4．5m。横隔板采用实腹式和空腹式2种，为充分发挥材料性能，横隔板间距取2．25m。两纵粱之间设3道小纵梁，小纵梁采用工字形断面，为使桥面板达到双向板的受力性能，小纵梁高度取0．8m。结合段主纵梁采用后承压板格构式方案、小纵梁采用前承压板式方案以保证主梁内力的平顺传递和刚度的平缓过渡。结合梁段斜拉索采用锚拉板锚固。关键词：斜拉桥；混合梁；结合梁；分离式双箱PK断面；构造设计中图分类号：U448．27；U448

3、．216文献标志码：A]DesignofCompositeGirderHavingPKBridgeSectionofSeparatedTwinBoxesforHuguangRoadBridgeCrossingChaohuLakeCHANGFu—ping，LUYong—cheng，LJWen—bo，SHENQi(ShanghaiMunicipalEngineeringDesignInstitute(Group)Co．，Ltd．，Shanghai200092，China)Abstract：ThemainbridgeoftheHuguangRoadBridg

4、eCrossingChaohuLakeinChaohuCity，AnhuiProvinceisahybridgirdercable—stayedbridgewithasinglepylon，doublecableplanesandwithspanarrangement(40+45+117．5)m+300m．Atthesidespanofthebridge，2auxiliarypiersarearrangedandinarangeof108．5mofthemainandsidespansnearbythePy—lon，themaingirderisdes

5、ignedasthecompositegirderthatis3mindepthand37minfullwidth．ThecompositegirderismadeupoftheconcretedeckslabsandsteelboxgirdersandthesteelboxgirdersareofthePasco—Kennewick(PK)Bridgesectionofseparatedtwinboxes．Thewidthofthetopplateofasinglelongitudinalsteelboxgirder(thewindfairingis

6、included)is10．21mandthebottomplateis4I13．．ThetwolongitudinalsteelboxgirdersareconnectedbythecrossbeamsthathaveI-shapesectionsandspacingdistanceof4．5m．2typesofthesolidandhol—lowdiaphragmsareemployed．Tobringthematerialperformanceintofullplay，thespacingdis—tanceofthediaphragmsis2．2

7、5m．Inbetweenthetwolongitudinalsteelboxgirders，3stringsthathaveI—shapesectionsarearranged．Toensurethatthedeckslabstohavethedua11oadbear—ingcapacity，t]hedepthofeachstringeris0．8m．ThelongitudinaImaingirderatthejointsectionofthebridgeISprovidedwiththerearbearingplatecellarstructures

8、andthestringersareprovid—edwiththefrontbearingp