Discrete vortex analysis on suppression mechanism of flow-induced vibration of a box girder by installing a vertical plate attached at the bottom plate

This paper focused on reduction mechanism of vortex induced vibration by installing a vertical plate attached at a bottom plate. In this study, discrete vortex method was employed for the analysis. The results were as follows. The vertical plate has influences on flows and pressure distributions around a girder. Non-dimensional parameter h/H was important on the stabilization of heaving responses. Parameter h is the height of the plate and H is a height of time-integrated share layer from bottom plate which was given as the result of the static analysis of the basic section. In order to suppress the vibrations more effectively with the interference of the separation flow from a leading edge, the value h/H of 1.0 was recommended.