Finite element analysis for the strengthening of reinforced concrete beams with weak shear reinforcement using high performance fiber reinforced concrete plating

Abstract

Weak beams in shear are not uncommon to find on site and are mostly the fault of human error. But once these beams are cast, it has proven difficult to obtain desired results from such beams without having to dispose of them. Thus, this study set out to provide the industry with a possible strengthening technique to salvage what has been produced instead of wasting more material in an age where it is proving costlier to do so. The idea here, was to glue on RC beams with relatively weak shear reinforcement, HPFRC plates in different positions (on the sides and the bottom) and with differing length (continuous and discontinuous) to possibly provide the desired load carrying capacity and deflection. This experimental work was carried out in FEA models and then compared to a cast in lab specimen. The results have shown that FEA models could be used in replacing experimental beams to validate the hypothesis, while keeping in mind that these models might provide a minor stiffer response than the actual values. Also, the legitimacy of using this strengthening approach was proven correctly in increasing stiffness and decreasing deflection of our faulty beams. It was also perceived that the best results were attained with the beams strength on the three sides with continuous plates. Finally, it is advised to confirm these results in the laboratory before implementing them in the field.