Control of the wind-induced vibration of cable-stayed bridges has become a matter of great concern in the field of bridge engineering. One of the most effective means of vibration control at present is the tuned mass damper(TMD), which has relatively high reliability and less need of maintenace.
The purpose of this study is to investigate the effectivness of the TMD in suppressing the dynamic responses of the bridge deck and tower under turbulent wind. A TMD is a sprung mass and dashpot system. A properly tuned TMD attached to a bridge significantly reduces its dynamic response near resonance. The analytical investingation shows that the optimal mass ratio(μ) of the TMD to the modal mass of the first vibration mode of the bridge is about 1%. It has been also found that multiple installation of TMD's at the deck and the tower is an effective way to reduce the response of the bridge under turblent wind.
