Postyield Bond Deterioration and Damage Assessment of RC Beams Using Distributed Fiber-Optic Strain Sensing System
Publication: Journal of Structural Engineering
Volume 145, Issue 4
Abstract
Postyield steel–concrete bond has been the subject of considerable investigations using pull-out or direct tensile tests; however, the degradation in bond due to reinforcement yielding in RC beams subjected to lateral loading has not been fully scrutinized. Conventional measuring instruments (strain gauges or LVDTs) cannot precisely measure strain distribution along the yielded reinforcing bar with a minimum level of interference to the bond. Therefore, this study reports the postyield behavior of bond in RC cantilever beams subjected to monotonic lateral loading monitored using a distributed fiber-optic strain sensing system (DFOSSS). The DFOSSS enabled accurate monitoring of deformations of the embedded reinforcing bars and the strains on the concrete surface. This allowed slip, steel stress, bond stress, bond deterioration length, and the locations of cracks to be determined. Using the new values for maximum bond stress, a model was proposed to predict pre- and postyield bond behavior, including steel strain effect. Finally, the mean bond stress values were presented for the simple assessment of bond strength in both pre- and postyield regions.
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Acknowledgments
The authors gratefully acknowledge the funding provided by the New Zealand Natural Hazard Research Platform with the project SAFER Structures and Residual Capacity and Repairing Options for RC Structures, and the assistance of the Structures Laboratory of the University of Canterbury for providing their support throughout this study. The authors also thank Matthew Davis for his technical advice, and Andrew MacDonald for comments that greatly improved the manuscript.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 4 • April 2019
Copyright
©2019 American Society of Civil Engineers.
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Received: Oct 9, 2017
Accepted: Sep 10, 2018
Published online: Jan 24, 2019
Published in print: Apr 1, 2019
Discussion open until: Jun 24, 2019
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