The characteristic of stay-cable damping system in consideration of bridge deck vibration

The coupled vibration impact of the bridge deck-cable-damper is not reasonably considered in existing vibration models. In this study, a new analytical model is developed in order to investigate the coupling effects among deck-cable-damper. To investigate the affects of modal damping of the cable-damper system subjected to the coupling motion with the deck, the normalized damping ratio is calculated by a numerical process of the normalized damper coefficient for different support conditions. The result shows that the external damping should be greatly increased to provide the same non-dimensional modal damping with the decrease of the stay angle, and that existing models overestimated the value of the non-dimensional modal damping. The new model matches well with the actual occurrence in bridge engineering.