金鸡达旦河大桥成桥钢箱拱肋内力分析研究

Analysis on Internal Force of Steel Box Arch Rib of Jinji Dadan River Bridge

金鸡达旦河大桥是主跨为265 m下承式钢箱系杆拱桥[1],两岸钢箱拱肋和主梁均与拱座固结,此桥不仅桥型美观、结构形式简单,而且经济性能良好,所以是当今社会拱桥中采用的主要形式之一。以此桥为依托工程,从总体设计中结构重要参数对成桥钢箱拱肋内力进行研究;该桥整体结构为简支体系,但结构内部受力复杂,通过对该桥系杆张拉顺序、拱轴系数、矢高参数的研究,分析成桥钢箱拱肋受力状况;该桥系杆张拉顺序采用工况1,拱轴系数采用1.3,矢高采用53 m;希望对未来此类桥梁建设起到参考的作用。

Jinji Dadan River Bridge is a through steel box tied arch bridge with a 265-meter main span,the steel box arch ribs and main beams on both sides are consolidated with the arch seat. This type of bridge is not only beautiful in shape and simple in structure, but also has good economic benefits, so it is one of the main forms adopted in contemporary arch bridges. Taking this bridge as the engineering background, this paper studied the internal force of the steel box arch rib according to the important structural parameters of the entire design. The overall structure of the bridge is simply-supported system with complex stress inside the structure.Through the study of the tensioning sequence of the tie bar, arch axis coefficient, and rise parameter of the bridge, the stress of the steel box arch rib was analyzed, expecting to provide reference for similar bridge construction in the future.