Modelling of tuned mass dampers for wind-tunnel tests on a full-bridge aeroelastic model

摘要

A full-bridge aeroelastic model study of a multi-span approach bridge is reported in this paper. The objectives of the investigation were the study of vortex-shedding oscillations observed for the vertical bending modes during section model tests, and the determination of the effectiveness of external means for reducing these oscillations. The effect of aerodynamic appendages such as guide vanes was studied as well as the effect of introducing additional damping to each of the seven 193 m bridge spans using tuned mass dampers (TMDs). Model TMDs with adjustable frequency and damping were designed and their effect on the aeroelastic model was investigated. The key to the model TMDs was the adjustable inherent damping provided by an electromagnetic (eddy-current) mechanism. A detailed description of the TMD physical modelling is given and the use of a full-bridge aeroelastic model as a design tool for the deployment and tuning of TMDs is illustrated.