20 Nov New paper on the flexural behaviour of RC beams strengthened with externally bonded reinforcement on grooves CFRP laminates
Researchers of AMADE – Universitat de Girona (A. Codina, C. Barris, Y. Jahani, M. Baena, L. Torres) have published the paper entitled “Experimental and theoretical study on the flexural behaviour of RC beams strengthened with externally bonded reinforcement on grooves CFRP laminates” in the journal Engineering Structures (Volume 299, 15 January 2024, 117091). The document can be downloaded free of charge for 50 days ending on December 26, 2023 at: https://www.sciencedirect.com/science/article/pii/S0141029623015067?dgcid=author
This paper is part of the PhD thesis of Alba Codina under the supervision of Dr. Cristina Barris and Dr. Lluís Torres, and it presents a study on the flexural capacity of Reinforced Concrete (RC) beams strengthened with Externally Bonded Reinforcement on Grooves (EBROG) Carbon Fibre Reinforced Polymer (CFRP) laminates. Thirteen single-shear tests and seven RC beams strengthened with CFRP are examined, comparing Externally Bonded Reinforcement (EBR) and EBROG techniques with different groove distributions. The results showed that EBROG improved the bond and flexural performance. Comparison with existing prediction models reveals that while the literature models accurately predict EBR results, they underestimated the bending capacity for EBROG due to calibration based on EBR bond parameters. Consequently, a numerical model is developed to simulate Intermediate Crack Debonding (ICD) for various bond-slip laws, applicable to the different strengthening techniques. The proposed model is validated using experimental flexural tests and calibrated bond-slip laws obtained from single-shear tests, demonstrating accurate prediction of ICD failure for both EBR and EBROG.
The authors wish to acknowledge the support of S&P Clever Reinforcement Ibérica Lda. for supplying the laminates and the epoxy resin used in this study.
This work was supported by the Spanish Ministry of Science and Innovation (MCIN/ AEI) under project PID2020-119015 GB-C22 (MCIN/AEI/10.13039/5011000011033) and the Generalitat de Catalunya, under the Grant number 2020_FISDU 00476.