平潭海峡公铁两用大桥双层结合全焊钢桁梁设计

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1、桥梁建设2016年第46卷第1期(总第236期)BridgeConstruction，Vo1．46，No．1，2016(TotallyNo．236)文章编号：1003—4722(2016)01—0001—05平潭海峡公铁两用大桥双层结合全焊钢桁梁设计孙英杰，徐伟(中铁大桥勘测设计院集团有限公司，湖北武汉430056)摘要：平潭海峡公铁两用大桥深水区非通航孔引桥采用跨度88m和80m的双层结合全焊钢桁梁。其中88m钢桁梁采用带副桁的华伦式桁架，桁高13．5m，桁宽14m，标准节间长1O．8m。上层公路桥面宽35．5m，采用钢筋混凝土板与钢桁上层纵、横梁结合，标准桥面板厚0．25m；下层

2、铁路桥面采用双幅预应力混凝土槽形梁，竖墙和底板厚0．36m，利用剪力钉与钢桁铁路横梁结合。该桥采用双层结合桥面避免桥面铺装难题，利用公路纵梁缩短弱化桥面系的共同作用，通过抬高桁架节点位置实现曲线超高，优化铁路槽形梁结合顺序充分发挥预应力，选用钢梁全焊整体架设技术降低海上施工风险，实现了跨海大桥建设的标准化、工厂化、预制化、大型化。关键词：跨海大桥；公路铁路两用桥；钢桁梁；双层结合；铁路槽形梁；全焊；结构设计中图分类号：U448．121；U448．211文献标志码：ADesignofCompositeDoubleDecksandFullyWeldedSteelTrussGirderof

3、PingtanStraitsRail-‘cum-RoadBridgeSUNYing-jie，XUWei(ChinaRailwayMajorBridgeReconnaissance&DesignGroupCo．，Ltd．，Wuhan430056，China)Abstract：Thecompositedoubledecksandfullyweldedsteeltrussgirderhavingthespanlengthof88mand80misdesignedforthenon—navigablespanapproachbridgeofPingtanStraitsRail—cam—Roa

4、dBridgeoverthedeepwaterarea．Ofthetwospanlength，the88mtrussgirderistheWarrentrusswithauxiliarytrusses．Theheightofthetrussis13．5m，thewidthis14mandthestandardpanellengthis10．8m．Theupperhighwaydeckonthetrussgirderis35．5mwideandisacompositestructuremadeupofthereinforceconcretedeckslabswithstandardth

5、icknessbeing0．25mandthestringersandcrossbeamsofthetrussgirderattheupperdeck．Thelowerrailwaydeckonthetrussgirderisalsoacompositestructureandisdesignedintothetwinpres—tre!ssedconcretechannelgirdersthathavethevertica1wallandbottomslabthicknessof0．36mandthatareconnectedwiththecrossbeamsofthetrussgi

6、rderatthelowerdeckbytheshearstuds．Theapplicationofthecompositedoubledeckssteeltrussgirdertothebridgecanavoidthecomplexproblemofdeckpavementconstructionandthestringersofthehighwaydeckcancontrib—utetotheshorteningandweakeningofthejointactionofthefloorsystem．Byraisingthepositionsofthepanelpointsof

7、thetrussgirder，thecurvesuperelevationofthegirdercanbeachieved．TheoDtimizationoftheconnectionsequencesoftheprestressedconcretechannelgirdersandthecrossbeamscanbringtheprestressintofullplayandthechoiceofthefullweldingandintegralerec