Design Optimization On Axial Cord Of Concrete Filled Steel Tube Arch Bridge

Tied concrete-filled steel tubular arch bridges, as a novel structural system, the tied concrete-filled steel tubular arch bridge has special mechanical behavior and long-span ability, which occupies a competitive position in field of modem bridges. With the span increasing, the arch axial deformation during course of construction is also increasing, the capability in compression of arch material isn't made use of well. In order to approach the logical arch axis after the bridge finished, on the basis of Nan-pu-hong Bridge in Ezhou city, Hubei province, the pre-arch is optimized by Ansys and the axial cord of arch is optimized by Matlab optimization tool box based on the actual project, which is referenced for designing this type of structure.Main ideas of this paper will expound are as follows:1. The structure characteristic, development process, the research's actuality about tied concrete-filled steel tubular arch bridges, and the several common axial cords of arch are minutely analyzed and contrasted.2. Based on the design principle of pre-arch, the setting methods and the factors considered in actual setting of concrete-filled steel tubular arch bridge are introduced, and the scope of application of the setting methods has been contrasted based on the actual concrete-filled steel tubular arch bridge.3. The analysis model of finite element method of concrete-filled steel tubular arch bridge is established in this paper by using ANSYS based on the actual project, and the courses when the bridge is constructed are simulated.4. Cording to the actual bridge's construction loading of tied rod, the pre-arch under gravity force is optimized by space finite-element-method software. The axial cord of arch optimized approaches pressure line, the biggest value off axial cord of arch is lower 41.2 percent than before. The result shows it is suitable to optimize the axial cord of arch by Ansys.5. Cubic spline function is adopted to as approximate the logical arch axis, the axial cord of arch is optimized by Matlab optimization tool box, The result shows that the biggest value off axial cord of arch after it optimized is lower 25.0 percent than before. The optimum solution will be done by compiling simple program with this method, thus, the result is fail-safe, and the computation is efficient.The researching achievements are some significant and valuable to the setting of pre-arch and optimization of axial cord on concrete-filled steel tubular arch bridge in this paper in practice.