大跨度钢桁拱桥主梁过渡段结构设计与研究

Design and Study on Transition Segment Structure of Long-span Steel Truss Arch Bridge Girder

摘要:

以株洲清水塘双层钢桁架拱桥工程为背景，介绍了多跨桥梁中跨采用UHPC轻型组合桥面板钢主梁，边跨采用传统钢混组合梁的主梁布置形式，详细讨论了主梁及桥面板过渡段的设计要点；结合空间有限元模型计算分析，验证了该类过渡段结构能够实现传力构造和刚度的稳定过渡，总结归纳了特大跨径桥梁过渡段结构的设计经验。

Abstract:

Taking the Zhuzhou Qingshuitang Double-deck Steel Truss Arch Bridge Project as the background, the layout forms of the UHPC light composite deck and steel girder used for the middle span, and the traditional steel-concrete composite girder used for the side span of multi-span bridge are introduced. The design essentials of the transition segment of the girder and deck are discussed in detail. Combined with the spatial finite element model of calculation and analysis, it is proved that this kind of transition segment structure can realize the stable transition of force transfer structure and stiffness. The design experience of transition segment structure of ultra-long-span bridge is summarized.