Experimental Study of Vibration Characteristics of FRP Cables for Long-Span Cable-Stayed Bridges
Publication: Journal of Bridge Engineering
Volume 20, Issue 4
Abstract
This study describes an investigation of vibration characteristics of carbon fiber-reinforced polymer (CFRP) and basalt FRP (BFRP) cables that can potentially be used in long-span cable-stayed bridges, compared with the traditional steel cable. Reduced-scale cable models were designed using similarity criteria and verified by examination of their dynamic characteristics. In-plane and out-of-plane vibration experiments on model cables were conducted using the step excitation method. The natural frequencies and modal damping of the cables were analyzed further, and the modeling of the damping ratios was studied using Rayleigh’s method. The results indicate that (1) the model cables well represent the dynamic properties, i.e., the equivalent natural frequencies of real long-span cables; (2) the probability of cable-deck resonance of bridges with FRP cables is lower than that of bridges with steel cables; (3) the damping properties of FRP are complex because of their inherent nonlinear material characteristics, but the equivalent damping of in-plane vibration of FRP cables is generally much larger than that of steel cables, whereas the equivalent damping of out-of-plane vibration of FRP cables is smaller than that of steel cables; and (4) the modal damping ratio of out-of-plane vibration can be accurately simulated by Rayleigh damping.
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Acknowledgments
The authors gratefully acknowledge the financial support of the National Key Basic Research Program of China (973 Program, No. 2012CB026200), the National Science Foundation of China (NSFC, No. 51108074 and No. 51378109), and the Jiangsu NSF (No. BK2010015).
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Published In
Journal of Bridge Engineering
Volume 20 • Issue 4 • April 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jan 6, 2014
Accepted: May 19, 2014
Published online: Jun 30, 2014
Published in print: Apr 1, 2015
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