Analytical and Numerical Study of Deck-Stay Interaction in a Cable-Stayed Bridge in the Context of Field Observations
Publication: Journal of Engineering Mechanics
Volume 139, Issue 11
Abstract
This paper addresses the mechanism of coupled deck-stay motions in cable-stayed bridges. Field observations of deck-stay interactions are summarized and an analytical model is developed to simulate such interactions. Using this model, a dynamic analysis of an example stay is conducted to illustrate the mechanism underlying the coupled motions. Three-dimensional finite-element models of a cable-stayed bridge are presented to confirm that coupling of deck-stay motions can occur in actual structures. A comparison between the results from the analytical and numerical models indicates that the proposed analytical model can reasonably explain the observed deck-stay interactions. In particular, it is shown that coupled motions are associated with the veering of natural frequency loci and mode localization and that the distributions of generalized masses between decks and cables are useful indexes for assessing the degree of coupling.
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Acknowledgments
This material is based upon work supported by the National Science Foundation (NSF) under Grant No. 0305903 and the Texas DOT (TxDOT), Austin, Texas. Support from the NSF and TxDOT is gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF or TxDOT.
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© 2013 American Society of Civil Engineers.
History
Received: Apr 14, 2011
Accepted: Jan 29, 2013
Published online: Jan 31, 2013
Published in print: Nov 1, 2013
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