许柯松 Xu Kesong

（中铁第五勘察设计院集团有限公司郑州分院， 河南 郑州 450000）

(Zhengzhou Branch of China Railway Fifth Survey and Design Institute Group Co., LTD., Zhengzhou, Henan 450000)

摘要：钢箱系杆拱以其造型美观、跨越性能强等优点，在实际工程应用上特点尤为显著。拱肋结构属于偏压结构，拱肋结构的成型在一定程度上决定了整个结构体系是否能够成桥运营的关键，研究其自身稳定性具有很重要的现实意义。本文以某五跨下承式复式钢箱系杆拱梁组合桥为分析对象，主要分析结构体系在屈曲模态下的稳定性，并对比分析弱拱肋间隔加强横撑对结构体系稳定性的影响。

Abstract: Steel box rod arch with its beautiful shape, strong spanning performance and other advantages, in practical engineering application. The arch rib structure belongs to the partial structure. The formation of the arch rib structure determines the key of whether the whole structural system can be operated as a bridge to a certain extent, and it is of great practical significance to study its own stability. This paper mainly analyzes the stability of a five-span double steel box girder arch beam composite bridge, and analyzes the influence of the reinforcement on the stability of the structural system.

关键词：钢箱系杆拱；屈曲稳定性；组合桥；下承式；

Key words: steel box tie rod arch; flexion stability; composite bridge; lower bearing type;