6533b838fe1ef96bd12a3d8b

RESEARCH PRODUCT

Steel fiber-reinforced concrete corbels:experimental behavior and shear strength prediction

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Corbels are structural members often used in reinforced concrete structures to transfer vertical and horizontal forces to principal members. This paper presents experimental research regarding the flexural behavior of corbels in plain and fibrous concrete and in the presence of steel bars. The study considers the influence of the type of concrete grade (normal- and high-strength concretes), of the fiber percentage and of the arrangement and percentage of the steel bars on the flexural behavior of the corbels. The results in terms of load-deflection curves and crack patterns show the effectiveness in using fibrous reinforced concrete corbels as well as in the presence of stirrups ensuring adequate strength and deformation capacity in reinforced concrete corbels. A simplified analytical model is proposed to calculate the shear strength of fibrous reinforced concrete corbels as well as in the presence of stirrups. The expression proposed for the calculation of the shear strength is then compared with other expression from the literature. The experimental results generated in terms of bearing capacity and those available in the literature are compared with the results obtained through the proposed model and with existing analytical expression. They show a good level of approximation, highlighting the role of the individual contributions from bars, concrete and fibers in the resistant mechanisms.