Analytical Model for Frictional Resistance between Cable and Saddle of Suspension Bridges Equipped with Vertical Friction Plates
Publication: Journal of Bridge Engineering
Volume 22, Issue 1
Abstract
For multispan suspension bridges, frictional resistance between the main cables and the saddles is essential for counterpoising unbalanced cable tension between different spans. The use of friction plates in saddles is one of the most common methods for increasing frictional resistance, and the corresponding evaluation method is vital for the design of suspension bridges. In this study, an analytical model for the calculation of frictional resistance between cables and saddles is presented. Large-scale model tests were performed to simulate the realistic friction conditions of a typical multispan suspension bridge in China, namely the Yingwuzhou Yangtze River Bridge, to validate the model. The main components of frictional resistance were analyzed, and the effects of vertical friction plates in enhancing frictional resistance were investigated by model tests and theoretical analyses. The results indicate that the presented analytical model provides an effective and feasible tool for evaluating the total frictional resistance and the contribution of friction plates in practice. The main components of total frictional resistance, including the frictions at the base and side contact interfaces between the cable and the saddle trough, are quantified, proving the former to be dominant. The parameter analyses reveal that the frictional resistance can be increased by 57% by incorporating six vertical friction plates for the actual saddle.
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Acknowledgments
This study was funded by the Fundamental Research Funds for the Central Universities under Grant 2682014CX078, the National Science and Technology Support Program of China under Grant 2011BAG07B03, and the National Natural Science Foundation of China under Grants 50908192, 51178394, and 51578455.
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Published In
Journal of Bridge Engineering
Volume 22 • Issue 1 • January 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 2, 2016
Accepted: Jul 8, 2016
Published online: Aug 30, 2016
Published in print: Jan 1, 2017
Discussion open until: Jan 30, 2017
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