Moving-Wheel Fatigue for Bridge Decks Strengthened with CFRP Strips Subject to Negative Bending
Publication: Journal of Composites for Construction
Volume 14, Issue 6
Abstract
This paper presents the negative bending of reinforced concrete slabs strengthened with near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) strips. Six slab specimens, three of which are strengthened with CFRP strips, are tested in static and fatigue loads. A wheel-running fatigue test machine is used to simulate vehicular loads on a bridge deck. The effectiveness of CFRP strengthening for bridge decks in cantilever and pseudonegative bending is examined based on moment-carrying capacity and cyclic behavior under the wheel-running fatigue loads, including crack patterns and damage accumulation. The moment-carrying capacity (static) of the cantilever slab strengthened with the NSM CFRP strips is improved by 68.4% when compared to that of an unstrengthened slab. The damage accumulation rate of the strengthened cantilever slab owing to the fatigue load is significantly lower than that of the unstrengthened slab. The damage accumulation of the strengthened slab gradually increases and is irreversible when the fatigue cycles increase. The fatigue-induced flexural cracks of the slabs develop along the wheel-running direction. A simple predictive model is presented to estimate the fatigue life of the test slabs.
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Acknowledgments
The writers wish to gratefully acknowledge the support of Dr. Mimura at Kure National College of Technology.
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Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 6 • December 2010
Pages: 784 - 790
Copyright
© 2010 ASCE.
History
Received: Dec 4, 2009
Accepted: Apr 27, 2010
Published online: May 5, 2010
Published in print: Dec 2010
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