Vortex-induced Vibration and Aerodynamic Countermeasures for Long-span Cable-supported Bridges with Twin Box Girder

Abstract

<p>VIV performance of twin box girders for three long-span cable-supported bridges in China was investigated through large scaled sectional model wind tunnel tests. Vortex-induced vibrations with large amplitude were detected for all three different types of twin box girders. Based on Particle Image Velocimetry technique, large scale vortices in the central vent were visualized and considered to have significant influence on the aerodynamic performance of twin box girder, especially vortex- induced vibration. Aerodynamic control measures, including guide vane, grid plate and adjustable wind barrier, were proposed to suppress this kind of self-excited vibration. The comparison and optimization of these countermeasures were then carried out to choose the best control scheme.</p>