Semnan University International Journal of Nonlinear Analysis and Applications 2008-6822 14 6 2023 06 01 Analysis and evaluation of debonding of reinforced concrete beams 327 333 7022 10.22075/ijnaa.2022.26868.3435 EN Hassan Vakili Ferezghi Structure and Earthquake Research Center, Taft Branch, Islamic Azad University, Taft, Iran Mohammad Reza Javaheri Tafti Structure and Earthquake Research Center, Taft Branch, Islamic Azad University, Taft, Iran Journal Article 2022 02 08 One of the causes of prosperity and success in the construction industry and one of the most common debonding is the debonding of the concrete cover and the separation of the concrete surface and the reinforcement plate. This paper evaluated the beams in the experiments due to an external force applied perpendicular to the longitudinal axis. The five reinforced concrete beams test specimen dimensions were 200×140×1300 mm, with rebar 10 for the bottom and 6 for the top, rebar 8 for the girders, and the concrete grade was considered 350. The final strength of 28 days with GFRP fibers in two layers, three classic layers, two layers, and three U-shaped layers are subjected to a four-point bending test. A control specimen was used for evaluation. The experimental results showed that the three U-shaped GFRP layers performed better than the other specimens and performed better in the biaxial bending test. The three U-shaped GFRP layers sheet had the most significant effect on flexural reinforcement and prevention of debonding compared to the classic U-shaped two-layer, three-layer, and two-layer GFRP sheets. In addition, Two U-shaped layers have more resistance to external load pressure than a U-shaped layer and have a more significant impact. https://ijnaa.semnan.ac.ir/article_7022_8631148504cfa7579f2b36678608b9df.pdf