Study on setting of wind flow angle in wind-resistant design of long-span bridges

Abstract

Range of angle of attacks is specified in the wind-resistant design of long-span bridges. It is understood that the angle of attack is caused by a constant wind inclination due to neighboring topography, fluctuating inclination angle due to wind speed fluctuations and static deformation due to wind load. The fluctuating inclination angle due to wind speed fluctuations was studied based on theoretical backgrounds, which concluded that ±3 degrees of the angle of attack is enough for a 1,500m suspension bridge on a flat terrain. In this study, based on filed measurements of wind and a wind-tunnel test, the theoretical backgrounds for the setting of the fluctuating inclination angle is verified and a more reasonable method is presented.