Performance and Repair Design of Stay Cables with Rain/Wind-Induced Vibrations |
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Authors: | Scott Witthoft Keith Kesner Randall W. Poston |
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Affiliation: | 1Graduate Student, Dept. of Mechanical Engineering, Stanford Univ.; formerly, Project Engineer, WDP and Associates, Inc., 402 W. 7th St., Austin, TX 78701. E-mail: switthoft@gmail.com 2Associate, WDP and Associates, Inc., 50 Washington St., So. Norwalk, CT 06854. E-mail: kkesner@wdpa.com 3Principal, WDP and Associates, Inc., 402 W. 7th St., Austin, TX 78701. E-mail: rposton@wdpa.com
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Abstract: | The results of a multifaceted investigation into large-amplitude vibrations of bridge stay cables are presented. The vibration of the stay cables occurred under light rain and wind conditions, and resulted in low-frequency, large-amplitude oscillations having recorded displacements of over 24?in. (0.6?m). Due to concerns about the implications of the vibrations on the integrity and durability of the stay cables and observed damage to stay-cable anchorage components, an investigation and repair program was developed. The final repair program arose from an investigation that combined the talents of practicing engineers, the Texas Department of Transportation, and representatives from four universities. Ultimately, a combination of supplemental hydraulic dampers and cable restrainers were used to mitigate the vibrations. This paper describes the results of the investigation and presents the practice-based methodology used to develop the implemented repair program. |
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Keywords: | Vibration Durability Damping Bridges, cable-stayed Fatigue Nondestructive tests Monitoring Rehabilitation |
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