Estimation Curve for Modal Damping in Stay Cables with Viscous Damper
Publication: Journal of Structural Engineering
Volume 119, Issue 6
Abstract
To simplify the procedure of designing viscous dampers for stay cables in bridges, a universal estimation curve is proposed that relates the modal damping ratio of the cable with attached damper, the mode number, the damper size, the damper location, and three parameters of the cable: span, mass per unit length, and fundamental frequency. The curve is obtained from numerical complex‐eigenvalue analysis of a taut cable with a single damper near the anchorage, with judicious grouping of these parameters into nondimensional factors. Several numerical examples illustrate the convenient use of this design aid, as well as show realistic values of the required damper size and location and the expected additional damping in the first few modes. The damping to be attained is usually high enough to suppress most vibrations induced by wind. However it is noted that a small sag of the cable and slight nonviscous properties of the damper may reduce the damper effectiveness. A modified design curve may have to incorporate these parameters to provide better accuracy.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 119 • Issue 6 • June 1993
Pages: 1961 - 1979
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Feb 2, 1991
Published online: Jun 1, 1993
Published in print: Jun 1993
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