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Buildings 2019, 9(2), 34; https://doi.org/10.3390/buildings9020034

Ultimate Shear of RC Beams with Corroded Stirrups and Strengthened with FRP

1
Department of Engineering, Università di Messina, 98166 Messina, Italy
2
Department of Engineering, Università di Palermo, 90128 Palermo, Italy
3
Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, 10129 Torino, Italy
*
Author to whom correspondence should be addressed.
Received: 26 December 2018 / Revised: 17 January 2019 / Accepted: 24 January 2019 / Published: 29 January 2019
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Abstract

Transverse reinforcement plays a key role in the response behavior of reinforced concrete beams. Therefore, corrosion of steel stirrups may change the failure mode of elements from bending to shear, leading to a brittle and catastrophic crisis. It is important to strengthen reinforced concrete beams with corroded stirrups to enhance the shear resistance. This paper presents a formulation, based on the modified compression field theory, to estimate the ultimate shear of reinforced concrete beams strengthened with FRP, because of stirrup corrosion. The detrimental effect of corrosion on steel stirrup yield strength was taken into account by introducing an empirical decay law. The effective strain of FRP reinforcement was adequately evaluated by considering both debonding and tensile stress rupture. The proposed model was validated against collected experimental results, showing a good ability to evaluate shear strength. Moreover, a numerical analysis was carried out to highlight the role of the key parameters predicting the ultimate shear. View Full-Text
Keywords: corrosion; stirrups; shear; FRP; MCFT; reinforced concrete; beams; parametric analysis corrosion; stirrups; shear; FRP; MCFT; reinforced concrete; beams; parametric analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Spinella, N.; Colajanni, P.; Recupero, A.; Tondolo, F. Ultimate Shear of RC Beams with Corroded Stirrups and Strengthened with FRP. Buildings 2019, 9, 34.

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