PSI - Issue 64

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ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 64 (2024) 1516–1523

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Interfacial behavior of hybrid-bonded CFRP-to-concrete joints Mehdi Aghabagloo a, *, Laura Carreras a , Cristina Barris a , Alba Codina a , Marta Baena a a University of Girona, Girona 17003, Spain Abstract Hybrid-bonded (HB) systems are employed to anchor carbon fibre reinforced polymer (CFRP) laminates to concrete structures and delay their premature debonding failure mode by generating compressive stresses on the joint. However, although previous research on these strengthening systems exists, the optimum parameters that minimize the potential for premature debonding failure and maximize the ultimate load still need to be investigated. In this work, the feasibility of decoupling the effect of decohesion and friction of a HB CFRP-to-concrete joint is assessed through experimental and numerical analysis. To this end, single shear tests are performed on concrete specimens strengthened with externally bonded reinforcement (EBR) and HB-CFRP precured laminate. Besides, a numerical procedure, based on the finite difference method and a metaheuristic optimization algorithm, is utilized to obtain the bond-slip law that describes the constitutive behaviour of both systems. Moreover, the separated contributions of the cohesion of the adhesive joint and the friction induced by the external compressive stresses normal to the composite surface are analysed separately, and separated cohesive and friction stress-slip laws are obtained. The experimental behaviour of the full anchoring system is compared against that obtained by combination of the separated cohesive and friction contributions. The method represents progress in examining how different anchoring parameters, including the size (width and thickness) of the anchor plate and the torque applied to the bolts, influence the performance of the anchoring system in an efficient and systematic manner. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: Reinforced concrete; externally bonded reinforcement; hybrid-bonded FRP, bond behavior; CFRP strengthening; SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Interfacial behavior of hybrid-bonded CFRP-to-concrete joints Mehdi Aghabagloo a, *, Laura Carreras a , Cristina Barris a , Alba Codina a , Marta Baena a a University of Girona, Girona 17003, Spain Abstract Hybrid-bonded (HB) systems are employed to anchor carbon fibre reinforced polymer (CFRP) laminates to concrete structures and delay their premature debonding failure mode by generating compressive stresses on the joint. However, although previous research on these strengthening systems exists, the optimum parameters that minimize the potential for premature debonding failure and maximize the ultimate load still need to be investigated. In this work, the feasibility of decoupling the effect of decohesion and friction of a HB CFRP-to-concrete joint is assessed through experimental and numerical analysis. To this end, single shear tests are performed on concrete specimens strengthened with externally bonded reinforcement (EBR) and HB-CFRP precured laminate. Besides, a numerical procedure, based on the finite difference method and a metaheuristic optimization algorithm, is utilized to obtain the bond-slip law that describes the constitutive behaviour of both systems. Moreover, the separated contributions of the cohesion of the adhesive joint and the friction induced by the external compressive stresses normal to the composite surface are analysed separately, and separated cohesive and friction stress-slip laws are obtained. The experimental behaviour of the full anchoring system is compared against that obtained by combination of the separated cohesive and friction contributions. The method represents progress in examining how different anchoring parameters, including the size (width and thickness) of the anchor plate and the torque applied to the bolts, influence the performance of the anchoring system in an efficient and systematic manner. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: Reinforced concrete; externally bonded reinforcement; hybrid-bonded FRP, bond behavior; CFRP strengthening; © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

Corresponding author: E-mail address: mehdi.agha@udg.edu Corresponding author: E-mail address: mehdi.agha@udg.edu

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

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