Review on rehabilitation of rc deep beams using external bonded frp and nsm technique

Abstract

Due to a variety of reasons, including increased service loads, environmental impacts, construction errors, and mechanical impediments, the strengthening process was becoming necessary for many concrete buildings worldwide. The strengthening process is carried out in several ways, the most common of which are the Near-Surface mounted (NSM) technique and the External Bonded Reinforcement (EBR) technique. The main object of the strengthening process is to increase the strength and durability of reinforced concrete structures and reducing early failure. This research discussed the most important papers that dealt with strengthening deep beams due to their exposure to heat or extreme loads using two techniques (NSM) and (EBR). Several results were reached through experimental testing of the specimens of each research, especially the most important of them: First, making openings, when necessary, away from the loading path because the opening in the loading path reduces the capacity of the beam. Secondly, resorting to using the mechanical method when installing the fiber-reinforced polymer externally, as it greatly reduces the tearing and collapse of the sheets. Third, the number of layers must be less than three when using (GFRP) sheets in the strengthening process, as violating this will cause a decrease in the final capacity of the beam. Fourth, resorting to inclined schemes when strengthening deep beams or repairing them with various materials made of carbon fiber-reinforced polymer (FRP). Finally, it is possible to use (CFRP) bars with (NSM) technology, as this option can be relied upon to rehabilitate damaged structures.