斜拉拱组合桥与普通拱桥受力性能对比

Comparative Study on Mechanical Behavior of Cable-Stayed Arch Bridge and Ordinary Arch Bridge

分析了斜拉拱组合桥的结构受力特征以及与普通拱桥的差别。以我国正在建设的主跨为400 m的斜拉拱组合桥梁——湘江四大桥为例,利用大型有限元分析软件AN SY S,建立了斜拉拱组合桥的三维空间有限元模型,对桥梁振动频率及振型进行了分析,通过与普通拱桥的分析和对比,重点研究了斜拉索对钢管拱组合桥的静、动力特征的影响,对比分析了两种拱桥型式,相同位置影响线的差异。最后总结了斜拉拱组合桥的静、动力特征,得到了一些有益的结论,为这一新颖桥型的方案选取和设计提供参考。

The mechanic characters of the cable-stayed arch bridges and contrast with the ordinary arch bridges are studied in this paper. Taking a cable-stayed arch bridge with main span of 400 m Under construction, the Fourth Bridge over Xiangjiang River, as an example,the 3-D finite element models are established by ANSYS software based on the bridge for analysising dynamic characteristics of cable-stayed arch bridges including self-vibration frequency and mode shape of vibration. By comparison with ordinary arch bridge,the effects of cables on the static and the dynamic characteristics of cable-stayed arch bridge are discussed with emphasis ,the difference of the two kinds of arch bridges are contrasted with. In the end, the static and dynamic characteristics of cable-stayed arch bridge are summarized. The conclusion may serve as reference to alterative selection and design of such new type of the bridge.