Fecha de publicación: 01/01/2025 Fuente: Materials Abstract
The article presents the results of experimental studies of reinforced concrete beams on the shear without transverse reinforcement strengthened by the FRCM system. For the implementation of the research, four experimental samples were designed and manufactured, with cross-sectional dimensions of 200x100 mm and a length of 2100 mm. The beams are designed in such a way that even after strengthening the support areas, the failure occurs due to the shear force. None of the samples is destroyed by the bending moment. The tests were carried out according to the authors’ improved methodology, by testing each sample twice. The samples were strengthened by the FRCM composite system at load levels of 0, 0.3, and 0.5 of the bearing capacity of the control samples. Reinforced concrete beams were strengthened by gluing P.B.O. fabrics in the form of vertical strips with a width of 70 mm, for the possibility of fixing the concrete strains in the support areas. Samples strengthened by the FRCM system are destroyed more smoothly and plastically than unstrengthened beams, and there is no mass fallout of concrete particles. According to the obtained data, graphs of the strain distribution in support area and the isofield of their distribution were constructed. In accordance with the results of the research, the maximum effect of the composite system use for the shear reinforcement was established by 26…57%. With increasing the load level at which the sample is strengthened, the effect of the strengthening decreased.