96 m钢-混组合桁架梁设计

新建安九铁路跨越武九客专受桥下净空限制,需采用大跨度、低高度桥式结构;同时结合后期维修养护及无砟轨道技术需求,桥面板宜采用混凝土结构,综合考虑本桥采用1-96 m钢-混组合桁架梁跨越武九客专。而96 m钢-混组合桁架梁结构为目前国内同类型桥梁结构最大跨径,并且首次应用于时速350 km无砟轨道。本文结合工程背景详细阐述96 m钢-混组合桁架梁整体设计思路,并对其结构尺寸、受力分析和施工方法进行深入探讨。本工程在安九铁路的成功应用为同类型结构在高速铁路上的推广应用积累了宝贵的设计和施工经验。

Design of 96 m Steel-Concrete Composite Truss Beam

Due to the clearance limit under the bridge,the newly-built Anqing-Jiujiang High-Speed Railway crossing Wuhan-Jiujiang High-Speed Railway needs to adopt a long-span and low height bridge structure.At the same time,in combination with the technical requirements of later maintenance and ballastless track,the bridge deck should adopt concrete structure.In comprehensive consideration,the bridge adopts 1-96 m steel-concrete composite truss beam to span Wuhan-Jiulong High-Speed Railway.The 96 m steel-concrete composite truss beam structure is the largest span of the same type of bridge structure in China,and it is first applied to ballastless track with a speed of 350 km/h.Combined with the engineering background,this paper introduces the overall design idea of 96 m steel-concrete composite truss beam,and discusses its structural size,stress analysis and construction method in detail.The successful application of the project in Anqing-Jiujiang High-Speed Railway has accumulated valuable design and construction experience for the popularization and application of similar structures in high-speed railway.