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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
(a) Delamination of the tensioned BFRP bars inside the hollow core of the 4Ø4–16 configuration; (b) shear cracks along the length of the BFRP bars and their pullout from the concrete matrix in the 8Ø4–16 configuration.