曹妃甸通港互通立交无背索斜拉桥设计

Design of Cable-stayed Bridge without Backstays in Caofeidian Interchanges to Port

唐曹高速公路通港互通立交为一座独塔单索面无背索斜拉桥,桥梁全长120 m,跨径组合(47+73)m,全宽34 m,主梁、塔、墩均采用全混凝土结构。针对该桥特点,其设计在结构处理方面与以往无背索斜拉桥均不同,首次采用塔梁分离,梁墩固结结构形式,并且主梁结构采用分幅式箱梁,受力简单,施工方便,避免了整体式宽桥的一些弊病。介绍该桥结构处理及受力特点,并介绍其结构计算。

The interchange to port in Tangcao Expressway is a single-pylon single-plane cable-stayed bridge without backstays. Its total length is 120 m. Its spans are 47 m+73 m. Its full width is 34 m. Its main girder,pylon and pier are all concrete structures. According to the characteristics of this bridge, its design of structure is different from any other cable-stayed bridges without backstays. The pylon is firstly separated from girder, the girder and pier consolidation structural type is used, and the main girder is the divided-piece box girder. Its stress is simple and the construction is convenient so as to avoid some faults of the integratedwide bridge. The article introduces the structural treatment and stress characteristics of this bridge, and introduces its structural computation.