Numerical Simulation Of Wind Pass A Square Bridge Tower And Fluid-solid Coupling

The bridge plays an indispensable part in traffic and transportation in modern societies. Especially in recent years, the development of three-dimensional traffic has highlighted the role of bridges in traffic. As science and technology constantly develop, the progress in bridge design and application is rather remarkable and the number of large-span cable-stayed and suspension bridges is also on the increase. The bridge tower is the major bearing structure for a large-span cable-stayed or suspension bridge and is crucial for the safety and stability of the entire bridge. In general, large-span cable-stayed and suspension bridges require bridge towers with a length of more than tens or hundreds of meters. Due to the unproportionate slenderness ratio, the bridge tower becomes vulnerable to air and thus easy to be distorted or to vibrate, which will affect the stability of the entire bridge structure. Therefore, it is of great significance to carry out an in-depth research on the force feature of the bridge tower in a flow field.This paper conducts a numerical simulation analysis on the fluid-solid coupling of the bridge tower and air by adopting CFD approach. It utilizes the FEM software ANSYS/FLOTRAN and RNG k-εmodel to do numerical simulation analysis on the flow around column and square cylinder. Furthermore, a simplified model of a bridge tower is established, which is used for the numerical simulation analysis on the fluid-solid coupling. The paper presents the figures of vector field, speed and pressure distribution. Based on the analysis on the flow field, the paper summaries the force feature of a structure in a flow field and accordingly puts forward reasonable suggestions on the design of a structure in the wind field.