Full-Scale Experimental Investigation of Repair of Reinforced Concrete Interstate Bridge Using CFRP Materials
Publication: Journal of Bridge Engineering
Volume 11, Issue 3
Abstract
An experimental study is presented of the behavior of eight reinforced concrete bridge girders taken from a decommissioned Interstate bridge and retrofitted with three different carbon-fiber-reinforced polymer (CFRP) systems. Specimens were subjected to monotonic loading to failure with and without significant fatigue conditioning. Experimental observations indicated that intermediate crack-induced debonding was the dominant failure mode for monotonically loaded beams and that degradation of the CFRP-to-concrete interface was caused by fatigue conditioning. Conventional adhesive applied and near-surface mounted (NSM) CFRP systems behaved well under monotonic loads, with the NSM system exhibiting significantly greater ductility. Powder actuated fastener applied retrofit was observed to be less efficient, requiring a relative slip of the CFRP in order to engage the shear transfer mechanism of the fasteners. The application of current accepted design guidelines for FRP retrofit indicated that guidelines aimed at mitigating debonding failure appear to be appropriately conservative under monotonic loading conditions; however, a significant additional reduction in CFRP strain limits is required to account for even small levels of fatigue loading.
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Acknowledgments
The writers would like to thank Dr. Anthony Lamanna of Tulane University, Dr. Larry Bank of the University of Wisconsin-Madison, and Ms. Sarah Witt and Mr. Edward Fyfe of Fyfe Company. This research was supported through grants from the U.S. Department of Transportation and Federal Highway Administration, administered by the South Carolina Department of Transportation and the National Science Foundation (CMS 9908293). The opinions, findings, and conclusions expressed in this paper are those of the writers and do not necessarily reflect the views of the sponsors.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 11 • Issue 3 • May 2006
Pages: 350 - 358
Copyright
© 2006 ASCE.
History
Received: Dec 28, 2004
Accepted: Apr 12, 2005
Published online: May 1, 2006
Published in print: May 2006
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