Wind experiment about an observed in-line vibration at the pylon of Hakucho Bridge

Abstract

This research focuses on the in-line vibration clearly observed among the certain wind speed at the pylons of Hakucho Bridge. To reveal its cause and characteristics, wind tunnel experiment was conducted. In the experiment, the displacement of tower and the air flow which hit on the tower of downstream were measured. As a result, when we can see the harmonic vibration, the frequency of vortex is almost equal to natural frequency of the model. After that, we changed the distance of the model, and tried some cases the same way, which turned out that we could see the in-line vibration at the certain distance of the tower.