PSI - Issue 42

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ

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Procedia Structural Integrity 42 (2022) 1668–1675

© 2022 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 the scientific committee of the 23 European Conference on Fracture – ECF23 Abstract This paper presents the development of a numerical model that simulates the fire response of reinforced concrete (RC) slabs externally strengthened with carbon fiber-reinforced polymer (CFRP)laminates using two different techniques, externally bonded (EB) and near-surface mounted (NSM). A three-dimensional (3D) nonlinear finite element (FE) model is developed to predict the thermal and structural behavior of strengthened RC slabs subjected to fire. The model incorporates temperature-dependent thermal and mechanical properties of concrete, steel reinforcement, and CFRP, as well as mechanical bond interaction between CFRP and concrete interfaces. The predicted temperature profiles, ultimate loads, and midspan deflections are compared with previously published experimental data. Results from the proposed model show a good correlation with the experimental data throughout the fire exposure duration. The validated model can be adapted to conduct parametric studies intended to inspect the effect of important factors that influence the behavior of strengthened RC slabs under fire. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: Strengthening; hybrid; CFRP; PET-FRP; flexure 1. Introduction Carbon fiber-reinforced polymers (CFRP) laminates have been widely used in the strengthening of existing reinforced concrete (RC) structures in the last decades (Danraka et al., 2017; M. Z. Naser et al., 2019; Siddika et al., 2019). Due to its superior properties, including high strength-to-weight ratio, resistance to corrosion, and ease of installment, it is well-known as the optimum choice of retrofitting materials available in the construction industry. However, it has some disadvantages that preclude the full utilization of its strength, such as its brittle nature and poor resistance to fire. CFRP can be applied to the soffit of RC beams or slabs using several techniques, amongst the most This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc 23 European Conference on Fracture - ECF23 Modeling the behavior of CFRP-strengthened RC slabs under fire exposure Maha Assad a , Rami A. Hawileh b, *, Jamal A. Abdalla b a Graduate student, Department of Civil Engineering, American University of Sharjah, P.O. Box 26666, Sharjah, United Arab Emirates b Professor, Department of Civil Engineering, American University of Sharjah, P.O. Box 26666, Sharjah, United Arab Emirates * Corresponding author, email: rhaweeleh@aus.edu exposure

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23

2452-3216 © 2022 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 the scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.210