Analysis Of Rain-wind-induced Vibration Of Cables In Cable-stayed Bridge By Finite Element Method

Cables in large-span cable-stayed bridge due to low frequency, small damping, easily evoked various wind-induced vibration, the rain-wind induced vibration phenomenon of cables in cable-stayed bridge is one of them. Rain-wind induced vibration induced by the wind and rain in the common role, is very destructive fierce substantial vibration. As rain-wind induced vibration happens frequently and harmfully, it has become one of the world difficult and hot research spots, and that the rain-wind induced vibration mechanism is quite complex, is one kind of intricate FSI problem, so the excitation has relatively slow progress in theoretical research.Cable structure of rain-wind induced vibration involves fluid dynamics, structural mechanics and nonlinear dynamics, and other subject areas. As a special kind of continuum, there is an obvious characteristic of the non-linear geometry . In the wind and rain load, as water line leading to changes in location of the cable structure, more complex and dynamic behavior makes its research more complicated than the general study of the dynamics, this is the main reason why wind-rain induced vibration research progresse quite slow. The research work considered the fluid and solid aspects, parameters of the rain-wind induced vibration and damping mechanism measures are studied by using mechanics analysis software in this article:(1) The research work used FLUENT in rain-wind induced vibration under different circumstances to analyse the liquid field and to calculate its lift and drag coefficient.(2) The paper founded a cable of 3-D continuous parabolic shape finite element model in cable-stayed bridge and used it to make static analysis and mode analysis in ANSYS. It was considered the impact of the rain-wind induced parameters more exciting, used FLUENT to calculate its aerodynamics. The paper initially realized the solid-fluid interaction, gradually researched each of its influencing factors by detailed analysis, and we get the results which match with the experimental data.(3) According to the rain-wind induced excitation analysis theory, the paper introduced common kinds of control and the damping measures, analyzed several kinds of numerical simulation experiment by using ANSYS, such as the attenuator absorbing vibration, air operated damping and the auxiliary rope damping method and so on, carried on the contrast with the front result, discussed each shock absorption measure rationality, and obtained the feasible conclusions.