Global Energy Balance–Based Debonding Modeling of NSM FRP-Strengthened Concrete Beam
Publication: Journal of Composites for Construction
Volume 24, Issue 1
Abstract
An important advantage of the near surface mounted (NSM) technique for concrete beam strengthening over the externally bonded reinforcement technique is its higher resistance to debonding failures. Despite the increased resistance, debonding failures do still occur on NSM strengthened beams. The aim of this paper is to investigate the possibility of using a global energy balance based fracture mechanics model for NSM strengthened beams. The methodology includes determining the available energy for the propagation of the interface flaw. Debonding failure occurs when the available energy for interface flaw propagation reaches the Mode I fracture energy of the concrete, as this is the weakest material of the concrete-fiber reinforced plastic (FRP) composite system. The validation using published experimental results demonstrates that the model is capable of predicting possible modes of debonding failure for NSM FRP strengthened reinforced concrete beams and for any material and geometric properties of concrete beams, adhesive, and FRP. Validation against published experimental results yields a satisfactory performance of the model. The mean ratio between simulated to experimental failure loads for NSM strengthened beams is 0.99 with a standard deviation of 0.09.
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Acknowledgments
The authors are grateful for the financial support toward this research by The University of Malaya-Malaysia, High Impact Research Grant (HIRG) No. UM.C/625/1/HIR/MOHE/ENG/36 (16001-00-D000036)—“Strengthening Structural Elements for Load and Fatigue.”
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Published In
Journal of Composites for Construction
Volume 24 • Issue 1 • February 2020
Copyright
©2019 American Society of Civil Engineers.
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Received: May 3, 2018
Accepted: Apr 9, 2019
Published online: Oct 29, 2019
Published in print: Feb 1, 2020
Discussion open until: Mar 29, 2020
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