三拱肋无风撑系杆拱桥受力特点

Behavior of Self-Anchored Three-arch Bridge

系杆拱桥具有受力合理、用材经济、施工方便、造型美观等突出优点在我国得到迅速发展。在桥宽较大的情况下,由于横梁的高度受限等原因,不得不采用3片拱肋,这就使得结构的纵向受力、横向受力以及结构的稳定性都成为十分突出的问题。本论文以德州京杭运河大桥为背景,分析3片拱肋无风撑系杆拱桥横向与纵向受力特点与设计要点。并对结构的稳定分析、实桥荷载试验进行介绍,为以后同类桥梁的设计提供参考。

Self-anchored arch bridge has become very popular in China because of its merits such as reasonable behavior under load,economy,easy to construction,and beautiful.But when the bridge becomes very wide,three arches must be adopted because of the limitation of the height of cross beams.And thus it makes the behavior of the bridge under load very complicated.Especially the analysis of the load distribution between the three arches,the behavior of the cross beams under load and the stability is more complicated than two-arch self-anchored bridges.In this paper,these problems are analyzed by the example of Dezhou Bridge,which is a self-anchored arch bridge with three arches.And the load experiment is also introduced in this paper.The analysis result is proved to be correct by the load experiment.The structure analysis method presented in this paper was also proved to be correct.