PSI - Issue 68

ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 68 (2025) 166–172

European Conference on Fracture 2024 Integrating experimental bond-slip models intro finite element modeling of CFRP-strengthened concrete prisms Aseel Salameh a , Rami Hawileh a, *, Maha Assad a and Jamal Abdalla a a American University of Sharjah, Department of Civil Engineering, P.O. Box 26666, Sharjah, United Arab Emirates Abstract The overall performance and failure mechanisms of externally bonded concrete structures with fiber-reinforced polymers (FRP) sheets/plates are significantly influenced by the bond behavior between FRP composites and concrete substrates. Finite element (FE) modeling and analysis depend on an accurate description of this bond-slip connection. This study represents the integration of experimental bond-slip models into finite element simulations of concrete prisms reinforced with carbon fiber-reinforced polymers (CFRP) sheets. For CFRP-to-concrete joints, experimental bond tests were carried out in a three-point bending configuration to determine bond-slip relationships. Cohesive zone modeling approaches were then used to implement the resulting bond-slip curves into a nonlinear FE model. The experimental data from CFRP-strengthened concrete prisms tests under various conditions were used to verify the FE model. The findings demonstrate the ability of the proposed FE approach incorporating experimentally derived bond-slip models to accurately capture the complex behavior of CFRP-strengthened concrete elements including debonding failures. Moreover, this paper demonstrates the significance of accurate bond characterization and offers a framework for better finite element modeling of reinforced concrete structures using fiber-reinforced polymers, allowing for more accurate structural evaluations and design optimizations. © 2025 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) European Conference on Fracture 2024 Integrating experimental bond-slip models intro finite element modeling of CFRP-strengthened concrete prisms Aseel Salameh a , Rami Hawileh a, *, Maha Assad a and Jamal Abdalla a a American University of Sharjah, Department of Civil Engineering, P.O. Box 26666, Sharjah, United Arab Emirates Abstract The overall performance and failure mechanisms of externally bonded concrete structures with fiber-reinforced polymers (FRP) sheets/plates are significantly influenced by the bond behavior between FRP composites and concrete substrates. Finite element (FE) modeling and analysis depend on an accurate description of this bond-slip connection. This study represents the integration of experimental bond-slip models into finite element simulations of concrete prisms reinforced with carbon fiber-reinforced polymers (CFRP) sheets. For CFRP-to-concrete joints, experimental bond tests were carried out in a three-point bending configuration to determine bond-slip relationships. Cohesive zone modeling approaches were then used to implement the resulting bond-slip curves into a nonlinear FE model. The experimental data from CFRP-strengthened concrete prisms tests under various conditions were used to verify the FE model. The findings demonstrate the ability of the proposed FE approach incorporating experimentally derived bond-slip models to accurately capture the complex behavior of CFRP-strengthened concrete elements including debonding failures. Moreover, this paper demonstrates the significance of accurate bond characterization and offers a framework for better finite element modeling of reinforced concrete structures using fiber-reinforced polymers, allowing for more accurate structural evaluations and design optimizations. © 2025 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 ECF24 organizers Keywords: fiber-reinforced polymer; CFRP; bond slip; FEM 1. Introduction Bond strength, or simply the interface between the Fiber-reinforced polymer (FRP) material and the concrete foundation, is critical to the integrity and efficacy of FRP strengthened concrete structures (Abdalla et al., 2017; Biscaia et al., 2015; Cho et al., 2011; Mofrad et al., 2019; Lu et al., 2005). This interface transfers stress and maintains © 2025 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 ECF24 organizers Peer-review under responsibility of ECF24 organizers Keywords: fiber-reinforced polymer; CFRP; bond slip; FEM 1. Introduction Bond strength, or simply the interface between the Fiber-reinforced polymer (FRP) material and the concrete foundation, is critical to the integrity and efficacy of FRP strengthened concrete structures (Abdalla et al., 2017; Biscaia et al., 2015; Cho et al., 2011; Mofrad et al., 2019; Lu et al., 2005). This interface transfers stress and maintains

* Corresponding author. Tel.: +971 6 515 2496; fax: +971 6 515 2979. E-mail address: rhaweeleh@aus.edu * Corresponding author. Tel.: +971 6 515 2496; fax: +971 6 515 2979. E-mail address: rhaweeleh@aus.edu

2452-3216 © 2025 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 ECF24 organizers 2452-3216 © 2025 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 ECF24 organizers

2452-3216 © 2025 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 ECF24 organizers 10.1016/j.prostr.2025.06.038