Galloping Analysis of a Stay Cable with an Attached Viscous Damper Considering Complex Modes
Publication: Journal of Engineering Mechanics
Volume 144, Issue 2
Abstract
The use of viscous dampers to mitigate cable vibrations on cable-stayed bridges is very popular. A viscous damper attached to a stay cable results in complex mode shapes. Such complexity could affect the dynamic stability of the cable under wind action, yet it is neglected in conventional galloping analysis. A general framework to investigate the problem of galloping of a stay cable with an attached viscous damper is therefore developed. Aerodynamic forces on the complex modes are considered, including aeroelastic coupling between the modes. A numerical example for an ice-accreted stay cable with a damper shows that conventional galloping analysis overestimates the critical wind speed for galloping occurrence. The complexity of the mode shapes gives rise to the cable being more unstable than ignoring it by treating the mode shapes as real.
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Acknowledgments
The authors gratefully acknowledge the support of the research by the Newton Fund under the U.K. Royal Academy of Engineering Newton Research Collaboration Programme, Grant NRCP/1415/292. The first author is grateful to the Industrial University of Ho Chi Minh City for supporting this research.
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Published In
Journal of Engineering Mechanics
Volume 144 • Issue 2 • February 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Mar 29, 2017
Accepted: Aug 2, 2017
Published online: Dec 7, 2017
Published in print: Feb 1, 2018
Discussion open until: May 7, 2018
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