Shear Strength Capacity of Reinforced Concrete Corbels

Many researchers had experimentally investigated the parameters influencing the reinforced concrete corbel behavior and shear capacity. The main parameters studied in these researches were the influence of concrete compressive strength (f_c^'), shear span to effective depth ratio (a_v/d), longitudinal reinforcement percentage (ρ_s), horizontal reinforcement ratio (ρ_h), and effective depth (d). All specimens were tested under monotonic vertical load up to failure. Shear strength of corbels is essentially based on empirical or semi-empirical ‎equations. ‎In this work, a total of (47) tests of reinforced concrete corbels from the available in the literature and covered the main parameters are adopted to predict a proposal formula for the nominal shear strength of the corbel. This proposal is compared with ACI-318M- 2019 provisions and with the expressions proposed by other researchers. For the present proposed equation, the coefficient of variation (COV%) factor, which equals to 29.75% for the ultimate load, is the least (COV%) factor compared with other proposed equations. It was also found that the shear span to the effective depth ratio (a_v/d), the amount of horizontal reinforcement (stirrups) (ρ_h), the amount of main reinforcement (ρ_s), the compressive strength of concrete (f_c^') have a significant effect on the nominal strength of reinforced concrete corbels.