多跨中承式系杆拱桥的系杆组合布置方案研究

Analysis on the Tied-bar Composite Displacement of Multi-span and Half-through Tied Bar Arch Bridge

以江西余兴贵大桥为背景工程,采用有限元分析方法,研究多跨中承式系杆拱桥中的通长系杆与分跨短系杆作用,讨论合理系杆布置方案.结果表明,边跨系杆减小拱脚负弯矩,可改善刚构区受力性能;中跨系杆增大拱脚负弯矩,不利于主拱肋受力;通长系杆作用与边跨系杆相同.从平衡推力、结构内力影响及施工便利等方面综合考虑,边跨系杆与通长系杆的组合为合理方案.

The Yuxingui Bridge is chosen as an example. By using the finite element method, the effects of the through tied bar and the single span tied bar on the structural characteristics are analyzed and the reasonable tied bar displacement scheme is discussed. The results show that the side-span tied bar can reduce the negative moment of the arch springing region, and improve the mechanical behavior of the structure of the triangle rigid region. The middle-span tied bar raises the negative moment of the arch springing and causes the negative effect to the main arch rib. The function of the through tied bar is the same as the side-span tied bar, but its effect is less than that of the side-span tied bar. Final-ly , the displacement of tied bar which is composed of the side-span tied bar and the through tied bar is considered to be one reasonable scheme by considering the construction convenience, economy and the mechanical behavior of the structure.