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.