Tuned Dampers and Cable Fillers for Suppression of Bridge Stay Cable Vibrations.Report of Investigation

摘要

The project developed and evaluated damper systems for suppression of bridge staycable vibrations. Three dampling approaches--a tuned mass damper, a liquid damper, and wrapping cable with damping tape were tested using various grout mixes and cable models. In addition, a concept, based on cable guide pipe filled with polyurethane material, was also evaluated. The latex grout improved damping by about 60 percent as compared to the conventional grout. Use of neoprene washers also improved the damping significantly. However, both of these improvements were not adequate to control rain-wind vibrations based on current criteria. Use of a damping tape on the outside surface of the cable also did not produce any significant improvement. The results show turned mass damper to be the most cost-effective method that can be applied anywhere along the length of the cable either as a temporary or as a long-term solution to the rainwind vibration problem.