大跨度空间斜对称纽带拱桥设计与分析

Design and Analysis of Large-span Spatial Oblique Symmetrical Link Arch Bridge

摘要:

大运路潇河大桥为世界首座大跨度空间斜对称纽带拱桥，桥梁跨径布置为65 m+110 m+110 m+65 m=350 m。大桥通过横梁连接主、副拱与主梁形成拱梁固结，将空间斜对称纽带拱桥力学特性转化为拱梁组合体系，结构自平衡，无水平推力；桥梁拱肋采用抛物线拱轴线、箱形断面，斜跨主拱跨径国内最大为229 m；主梁采用半封闭双边钢箱梁；对桥梁进行了空间静力、疲劳、稳定、抗震性能整体分析及拱脚局部分析，结果满足规范要求。

Abstract:

The Xiaohe River Bridge on Dayun Road is the first large-span spatial oblique symmetrical link arch bridge in the world. Its layout of bridge span is（65+110+110+65）m=350 m. Its main arch and secondary arch are connected through the cross beam, and are formed the arch-beam consolidation with the main girder. The mechanical characteristics of the spatial oblique symmetrical link arch bridge are translated into an arch beam composite system with the self-balancing structure and without the horizontal thrust. The parabolic arch axis and box section are adopted for the arch ribs of the bridge. The inclined-span main arch span of 229 m is the largest span in China. The main girder is the semi-closed double-side steel box girder. The overall analysis of spatial static force, fatigue, stability and seismic performance of the bridge is conducted, as well as a local analysis of the arch foot. The results all meet the specification requirements.