Damping of Taut-Cable Systems: Two Dampers on a Single Stay
Publication: Journal of Engineering Mechanics
Volume 133, Issue 10
Abstract
The mitigation of in-plane stay oscillation in cable-stayed bridges is commonly addressed by placing an external mechanical damper, linear or nonlinear, on each stay or by introducing transverse cross-ties among cables. Although the problem of a cable with a single external damper has found significant attention in the past and different techniques have been proposed for the solution of the free-vibration problem, limitations are related to the fact that the location of the damper is usually very close to the cable end (on the bridge deck side) due to geometric constraints, leading to inherently low modal damping in the fundamental modes. In this paper the installation of more than one damper on an individual stay is considered to overcome such limitations and to increase the overall performance of the system. An existing procedure, based on the linearized taut-string theory, was modified to allow for the presence of multiple external discrete viscous dampers. The case of two devices with arbitrary location has been solved, identifying advantages and disadvantages of the proposed solution. In addition, extensions of the practical “universal curve” and the interpretation thereof are presented.
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Acknowledgments
This research has been supported in part through a Federal Highway Administration-sponsored project (Harold Bosch technical contact) on stay-cable vibration awarded to a team of investigators including HNTB Corporation, New York, Johns Hopkins University, Baltimore, Rowan Williams, Davies and Irwin, Ontario, Canada, Buckland and Taylor of Vancouver, B.C., Canada. The Fred Hartman and Veterans’ Memorial Bridges Project has been funded by the Texas Department of Transportation through Texas Tech University and the University of Texas at Austin. This material is also based in part upon work supported by the National Science Foundation under Grant No. NSF0305903. This support is gratefully acknowledged. The first writer would also like to acknowledge the support of Northeastern University, start-up funding for new faculty members. Any opinions, findings, conclusions, or recommendations expressed in this study are those of the writers and do not necessarily reflect the views of the National Science Foundation, the Texas Department of Transportation, and the United States Department of Transportation, Federal Highway Administration.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 133 • Issue 10 • October 2007
Pages: 1050 - 1060
Copyright
© 2007 ASCE.
History
Received: Jan 19, 2006
Accepted: Mar 29, 2007
Published online: Oct 1, 2007
Published in print: Oct 2007
Notes
Note. Associate Editor: Erik A. Johnson
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