主跨468m铁路钢箱混合梁斜拉桥设计

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1、桥梁建设2014年第44卷第1期(总第224期)BridgeConstruction，Vo1．44，No．1，2014(TotallyNo．224)文章编号：1003—4722(2014)01—0081—08主跨468m铁路钢箱混合梁斜拉桥设计刘振标，罗世东，潘茂盛，曾甲华(中铁第四勘察设计院集团有限公司，湖北武汉430063)摘要：宁波铁路枢纽北环线甬江特大桥采用半飘浮结构体系钢箱混合梁斜拉桥，孔跨为(53+50+50+66+468+66+50+50+53)m。钢一混分界点位于主梁中跨距桥塔24．5m处，除中跨419m采用钢箱梁外，其余均采用混凝土箱梁；桥塔采用钻石形混凝土结构，塔高177

2、．91m，上塔柱设内置式钢锚箱；斜拉索采用7mm的镀锌平行钢丝拉索，空间双索面扇形布置；基础采用超长、大直径群桩基础。混凝土梁采用支架逐孔现浇施工，钢箱梁采用节段吊装。设计针对铁路活载大、刚度要求高的特点，确定了合理成桥状态，并进行结构静力分析、抗震及抗风研究、车一桥及风一车一桥耦合振动分析，验证了结构的安全性和舒适性。关键词：铁路桥；斜拉桥；混合梁；箱形梁；桥塔；斜拉索；合理成桥状态；桥梁设计中图分类号：U448．27；U442．5文献标志码：ADesignofaRailwaySteelandConcreteHybridBoxGirderCable—StayedBridgewithMain

3、Spanof468mLIUZhen-biao，LUOShi-dong，PANMao—sheng，ZENGdia—hua(ChinaRailwaySiyuanSurveyandDesignGroupCo．，Ltd．，Wuhan430063，China)Abstract：TheYongjiangRiverBridgeontheNorthRingLinkoftheNingboRailwayTermi—nalisasteelandconcretehybridboxgirdercable——stayedbridgeofsemi—floatingstructuralsys—tem．Thespanarra

4、ngementofthebridgeis(53+50+50+66+468+66+50+50+53)m．Thecut—offjointofthesteelandconcretesectionsononesideislocatedinthecentralspanofthemaingirder，24．5mapartfromthepylon．Withtheexceptionthatthe419mlongsectionofthecen—tralspanisofthesteelboxgirder，therestsectionsofthebridgearealloftheconcreteboxgird—e

5、rs．Thepylonsofthebridge，eachbeing177．91minheight，arethediamond—shapeconcretestructures．Intheuppercolumnofapylon，thebuilt—insteelanchorboxisarranged．Thestaycablesaremadeupofthe7mmgalvanizedparallelsteelwiresandarearrangedinfan—shapeinspatialdoublecableplanes．Thefoundationsofthebridgearetheonessuppor

6、tedontheverylongandlargediametergrouppiles．Theconcreteboxgirdersarecastinsituonscaffoldingsspanbyspanwhilethesteelboxgirderisliftedandinstalledinblocks．Inthelightofthecharacteristicthattherailwayloadofthebridgeisgreatandtherequiredrigidityishigh，thereasonablecorn—pletedbridgestateisdeterminedinthed

7、esignandatthesametime，thestructuralstaticanalysis，thestudyoftheseismicresistance，windresistance，theanalysisofvehicle—bridgeandwind—vehi—cle—bridgecouplingvibrationarecarriedoutandthestructuralsafetyandcomfo