Influence of Negative Stiffness Damper on Stay Cable with Neoprene Rubber Bushings
Publication: Journal of Engineering Mechanics
Volume 147, Issue 7
Abstract
Stay cables on cable-stayed bridges are inherently low-damped flexible structural members. In order to improve their energy-dissipating capacities, external dampers are installed to control undesired cable vibrations. Typically, external dampers are mounted near the cable anchorage and their performance reduced in the case of longer cables. In addition to this, damper performance is also reduced by the presence of neoprene rubber bushings, which are provided to reduce the bending stresses due to live loadings. In this study, a concept of negative stiffness in an external damper is suggested to improve the damping of stay cables equipped with rubber bushings. An analytical approach is used to explore the modal behavior of a cable-damper system mounted with neoprene rubber bushings. The solution is expressed in the approximate (asymptotic approach) as well as the exact approach. An expression for effective damper location and design damping curves are proposed for the benefit of designers and researchers. The lower-bound limit of a negative-stiffness damper is also derived, and its effect on damper performance is explored. Damping contour plots are developed to select the required level of damping from the available system parameters.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request, which include the (1) MATLAB code used to compute modal damping ratios, and (2) MATLAB code used to plot different figures.
Acknowledgments
The author is grateful to the FAST National University of Computer and Emerging Sciences Faculty Research Support Grant for supporting this project.
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Published In
Journal of Engineering Mechanics
Volume 147 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Oct 8, 2020
Accepted: Feb 24, 2021
Published online: May 13, 2021
Published in print: Jul 1, 2021
Discussion open until: Oct 13, 2021
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