Strength of Corroded RC Beams with Bond Deterioration
Publication: Journal of Structural Engineering
Volume 145, Issue 10
Abstract
The paper proposes strut and tie models for the flexure, shear, and bond strength of corroded reinforced concrete (RC) beams. The deterioration of the material properties including bond and the cross section losses are modeled. Generalized corrosion and pitting are considered. The models are verified with the experimental data of simply supported beams with transverse stirrups subjected to three- or four-point bending, which shows the reduced capacity and changes of failure modes caused by the deterioration. The main innovative contributions consist in a consideration of bond deterioration effects in strut and tie models of corroded beams with different shear span-to-depth ratios and the verification of the models by comparison with tests from different campaigns related in the literature that used either natural corrosion, environmental corrosion under load, or slow artificial corrosion. In addition, the fib Model Code 2010 provisions for bond and its deterioration due to low and medium corrosion levels are used and extended for higher corrosion levels; practical choices for cross section losses are defined.
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Acknowledgments
The authors acknowledge the discussions developed with Prof. J. Walraven in fib COM3 TG 3.2 “Modeling of Structural Performance of Existing Structures” and with Prof. J. Cairns in fib TG2.5 “Bond and Material Models.” Special thanks to Prof. J. Rodriguez and Geocisa – Dragados, ACS Group for information on the research group’s experimental work.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 10 • October 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Nov 27, 2017
Accepted: Dec 20, 2018
Published online: Jul 19, 2019
Published in print: Oct 1, 2019
Discussion open until: Dec 19, 2019
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