Parameters Analysis And Optimal Design For The Suspension Footbridge

Because of many advantages, such as the good economic capability, the beautiful sculpt, the adaptability to the geology and landform, the full display of the characteristic of great drawn intensity of cable wire with high strength, the strong across ability, it has an extensive prospect of application in the mountain area and the scenic Spot. The modern theory of suspension bridge often pay more attention on the long-span suspension bridge, and for the theoretical study of simple suspension footbridge, it has some imperfect from theory to practice.First, this paper discusses the basic calculation theory of the suspension bridge, the optimal design theory and the basics of parametric modeling. And the parameterized finite element modeling of the Huri suspension footbridge was established by the ANSYS' parametric design language APDL the parameterized finite element modeling will be used in the bridge analysis and optimal design.To better understand the characteristics of the suspension footbridge system, in this paper, as Huri suspension footbridge to be the engineering background, study stress state of suspension footbridge system when key parameters varied, such as the ratio of rise to span, the constrained way of the tower and the beam, the constrained way of the cable and the beam, the ratio of span, the dead load degree of the bridge floor system, the stiffness of the beam and the length of the middle boom. The common regularity which can be used to guide the design is obtained.As Huri suspension footbridge to be the engineering background, in this paper the optimization of the structure size of the suspension footbridge was made based on the design optimization module of ANSYS, and the material cost decreased by 5.4%. And the optimization of the initial strain the cable was also made based on the design optimization module of ANSYS.