斜拉拱组合桥与普通拱桥受力性能对比

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ANSYS,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.

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

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.