PSI - Issue 64

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ScienceDirect Structural Integrity Procedia 00 (2024) 000 – 000 Structural Integrity Procedia 00 (2024) 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) 1484–1491

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Experimental slip determination of upper GFRP-reinforcement in double span beam tests Tom Molkens a, *, Mona El-Hallak a a KU Leuven, Campus De Nayer, Department of Civil Engineering, J. De Nayerlaan 5, 2860 St-Kat.-Waver, Belgium Abstract Despite the impressive features of the steel rebar-reinforced concrete structures, i.e., ductility and rotation capacity, a new material combination has been recently introduced in the new generation of Eurocodes. Glass Fiber Reinforced Polymers (GFRP) rebars were used to replace the steel reinforcements in concrete structures due to their high corrosion resistance and eco-friendly production techniques. GFRP-reinforced concrete could alleviate the environmental issues that affect the durability of the structures, and mitigate the greenhouse gasses which are of great concern nowadays. Indeed, in many design rules of the actual codes, there are implicit (neglecting thermal, settlements, shrink, and creep effects) and explicit (for redistribution purposes) considerations of ductility, which is in general, delivered by the elastoplastic behavior of steel reinforcements. However, this is not the case in the GFRP-rebars where the stress-strain relation exhibits purely linear elastic behavior until failure. Nevertheless, the overall behavior of the GFRP-reinforced concrete structures does not depend only on the behavior of the concrete and GFRP-rebars but also on the bond between the GFRP-rebars and concrete matrix. It is proven that slip of reinforcements can occur which facilitates a more ductile behavior providing the desired ductility and rotation capacity. An experimental test set-up was built consisting of two identical double span (2×1.3 m) beams (0.24×0.30 m²) and two different configurations of upper reinforcement. The slip of the upper and bottom reinforcements was measured along with the applied loads and observed deformations. Hence, the redistribution capacity could be determined, showing the overall ductility of the GFRP-reinforced concrete despite the two main brittle components, i.e., concrete and GFRP-rebars. Results will be used for the revision activities of the new upcoming fib40 publication handling FRP-reinforced concrete structures. © 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: Redistribution; GFRP-reinforcement; Ductility; Rotation capacity; Experimental tests SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Experimental slip determination of upper GFRP-reinforcement in double span beam tests Tom Molkens a, *, Mona El-Hallak a a KU Leuven, Campus De Nayer, Department of Civil Engineering, J. De Nayerlaan 5, 2860 St-Kat.-Waver, Belgium Abstract Despite the impressive features of the steel rebar-reinforced concrete structures, i.e., ductility and rotation capacity, a new material combination has been recently introduced in the new generation of Eurocodes. Glass Fiber Reinforced Polymers (GFRP) rebars were used to replace the steel reinforcements in concrete structures due to their high corrosion resistance and eco-friendly production techniques. GFRP-reinforced concrete could alleviate the environmental issues that affect the durability of the structures, and mitigate the greenhouse gasses which are of great concern nowadays. Indeed, in many design rules of the actual codes, there are implicit (neglecting thermal, settlements, shrink, and creep effects) and explicit (for redistribution purposes) considerations of ductility, which is in general, delivered by the elastoplastic behavior of steel reinforcements. However, this is not the case in the GFRP-rebars where the stress-strain relation exhibits purely linear elastic behavior until failure. Nevertheless, the overall behavior of the GFRP-reinforced concrete structures does not depend only on the behavior of the concrete and GFRP-rebars but also on the bond between the GFRP-rebars and concrete matrix. It is proven that slip of reinforcements can occur which facilitates a more ductile behavior providing the desired ductility and rotation capacity. An experimental test set-up was built consisting of two identical double span (2×1.3 m) beams (0.24×0.30 m²) and two different configurations of upper reinforcement. The slip of the upper and bottom reinforcements was measured along with the applied loads and observed deformations. Hence, the redistribution capacity could be determined, showing the overall ductility of the GFRP-reinforced concrete despite the two main brittle components, i.e., concrete and GFRP-rebars. Results will be used for the revision activities of the new upcoming fib40 publication handling FRP-reinforced concrete structures. © 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: Redistribution; GFRP-reinforcement; Ductility; Rotation capacity; Experimental tests © 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. Tel.: +32 15 68 81 70. E-mail address: tom.molkens@kuleuven.be * Corresponding author. Tel.: +32 15 68 81 70. E-mail address: tom.molkens@kuleuven.be

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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