新白沙沱六线铁路长江大桥钢桁梁横断面的合理选择

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1、桥梁建设2014年第44卷第5期(总第228期)BridgeConstruction，Vo1．44，No．5，2014(TotallyNo．228)99文章编号：1003—4722(2014)05—0099—04新白沙沱六线铁路长江大桥钢桁梁横断面的合理选择王明慧，徐伟(1．渝黔铁路有限公司，重庆410014；2．中铁大桥勘测设计院集团有限公司，湖北武汉430056)摘要：新白沙沱长江大桥主桥为(81+162+432+162+81)m的五跨连续钢桁梁斜拉桥，上层布置四线客运专线，下层布置两线货运专线，是国内首座六线铁路桥。为合理选择该桥钢桁梁的

2、横断面，从结构的空间构成、受力及经济合理性等方面，对2片主桁与3片主桁、梯形斜桁断面方案与矩形直桁断面方案进行对比分析。结果表明：大桥采用2片主桁的矩形直桁断面方案既能满足线路的布置要求，又具有结构受力合理、钢结构制造安装方便和较好的经济性等优势。因此大桥钢桁梁最终采用2片主桁的矩形直桁断面，桁宽24．5m，桁高15．2m，上层桥面为正交异性板整体结构，下层桥面为纵横梁+道砟槽板结构。关键词：斜拉桥；铁路桥；钢桁梁；主桁；横断面；受力分析；经济性中图分类号：U448．27；U448．13文献标志码：ARationalSelectionofCrO

3、SSSectionofSteelTrussGirderforNewBaishatuoChangjiangRiverSix—LineRailwayBridgeWANGMing—hui，XUWei。(1．YuqianRailwayCo．，Ltd．，Chongqing410014，China；2．ChinaRailwayMajorBridgeReconnaissance&DesignGroupCo．，Ltd．，Wuhan430056，China)Abstract：ThemainbridgeoftheNewBaishatuoChangjiangRive

4、rBridgeisafive—spancon—tinuoussteeltrussgirdercable—stayedbridgewithspanarrangement(81+162+432+162+81)m．Theupperdeckofthebridgeisdesignedtocarryfour—linepassengerdedicatedrailwayswhilethelowerdecktocarrytwo—linefreightrailwaysandthebridgeisthefirstrailwaybridgetocarrysix—lin

5、erailwaysinChina．Torationallyselectthecrosssectionofthesteeltrussgirderforthebridgeinthedesign，theschemesofthecrosssectionsofthe2maintrussesor3maintrussesoftrapezoidinclinedtrussesorrectangularverticaltrusseswerecomparedandanalyzedfromaspectsofthestructuralspatialcomposition

6、，forceconditionsandeconomyrationality．Theresultsofthecomparisonandanalysissuggestthattheschemeofthe2maintrussesofrectangularverticaltrus—sesforthesteeltrussgirderofthebridgecannotonlymeettherequirementsoftherailwaylinearrangement，butalsohastheadvantagesoftherationalstructura

7、lforceconditions，convenientstee1structuremanufacturingandinstallationandbettereconomy．Insuchcase，theschemeofthe2maintrussesofrectangularverticaltrussesisfinallychosenforthebridge．Thesteeltrussgirderofthechosenschemeis24．5mwideand15．2mhigh．Ontheupperdeckofthetrussgird—eristhe

8、structureofintegralorthotropicplateandonthelowerdeckisstructureofcrossbeams