Prediction of Shear Strength of Reinforced Concrete Beams without Web Reinforcement

Abstract

A rational and mechanics-based equation is proposed for the prediction of shear strength of reinforced concrete beams without web reinforcement. This prediction is based on basic shear transfer mechanisms, a modified Bazant's size effect law, and numerous published experimental data, including high-strength concrete beams with compressive strengths of concrete up to 100 MPa (14,500 psi). Comparisons with experimental data indicate that the proposed equation estimates properly the effects of primary factors, such as concrete strength, longitudinal steel ratio, shear span-to-depth ratio, and effective depth. It is shown that the proposed equation is considered to be better than the other equations compared in this study with respect to accuracy and estimation of primary factors. A simplified design equation is also derived within the limited range of effective depth for practical purposes.

Shear Strength of the Groove of Precast Concrete H-Posts

“…The stud enhanced the shear resistance of the groove through the dowel action as shown by the experimental results. Furthermore, the higher strength of M30 grade concrete compared to the M15 grade concrete was seen to increasingly enhance the dowel action of the studs (Kim & Park, 1997).…”

“…After concrete cracking, the shear force carried by a member without shear reinforcement is resisted as a combination of three factors, namely, concrete compression zone (Vc), aggregate interlocking (Va), and dowel action (Vd) provided by the longitudinal reinforcement (American Concrete Institute, 2019). Kim & Park (1997) concluded that the contribution of Vd, Va and Vc was, respectively, 15-25%, 33-50% and 20-40%. The main factors influencing the dowel action are flexural rigidity of longitudinal bars and the strength of the surrounding concrete (Kim & Park, 1997).…”

“…Kim & Park (1997) concluded that the contribution of Vd, Va and Vc was, respectively, 15-25%, 33-50% and 20-40%. The main factors influencing the dowel action are flexural rigidity of longitudinal bars and the strength of the surrounding concrete (Kim & Park, 1997). For the groove, the reinforcement stud designed in this study served as a longitudinal bar of a typical beam.…”

Shear Capacity of Reinforced Concrete Beams Without Shear Reinforcement: A Review

“…Failure is brought on by a combination of shear and compressive loads because the concrete is not fractured. This means that the reinforcement ratio and compressive strength may both be used to describe shear force [2]. Many experiments on reinforced concrete beams subjected to concentrated loads demonstrate that the shear strength declined as the depth of the beam rose.…”