ANALYTICAL INVESTIGATION OF THE PERFORMANCE OF A DAMPER WITH A FRICTION THRESHOLD FOR STAY-CABLE VIBRATION SUPPRESSION

Abstract eng:
Because of the problematic large-amplitude vibrations that have been observed on the cables of the Fred Hartman cable-stayed bridge in Houston, Texas, a vibration suppression system is being designed, which will supplement the current cross-tie restraining system with fluid dampers, to be attached to the cables transversely near the anchorages. In the preparation of the damper design, inquiry revealed that fluid dampers typically may have a significant inherent friction threshold even when specified to have a linear force-velocity relationship. When the forces in the damper are below this friction threshold, the damper is completely locked, and no energy is dissipated. Motivated by the potentially large magnitude of the damper friction threshold and the apparent significance of its effect in the measured data, this paper presents an analytical investigation of the influence of a friction threshold on damper performance and summarizes a proposed design procedure that accounts for the friction threshold. This procedure determines the maximum allowable friction threshold, the viscous damper coefficient, and the power dissipation and maximum force capacities.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket