Aerodynamic Performance of Bridge with Typical Box Girder Sections at Different Web Inclinations

Abstract:

In this paper, concerning the critical aerodynamic geometrical parameters of a box girder, a series of web inclination angles (33 representative angles) were selected to fundamentally investigate the influence of web inclination angles on stationary aerodynamic stability performance of the long span bridge by using the computational fluid dynamics (CFD) method. The results show that there is a negative pressure zone at the junction of the bottom slab and the incline web when the angle of the web is small, which generates the downward force and decreases the lift coefficient of the box girder. By reducing the web inclination angle, the vertical and torsional displacements of the box girder at each wind speed are effectively reduced. The box girder with a lower web inclination angle can reduce the lift coefficient and drag coefficient of the box girder and can improve the stationary aerodynamic stability performance of the bridge.

Key words:static wind stability; web inclination; aerostatic instability mechanism; computational fluid dynamics(CFD); quasistreamlined box girder section