Study develops a formulation for shear resistance in reinforced concrete beams, suggesting enhanced reliability and safety parameters.
Background: The behavior of reinforced concrete beams to shear is still the subject of much research, mainly because the standards estimate last resistances higher than those observed experimentally, since they consider gains of resistance proportional to the increase of transverse reinforcement, without any limitation and without considering the contribution of other parameters, such as longitudinal reinforcement, for example. Materials and Methods: The Brazilian standard 2023 (2023) is no exception and also presents low accuracy and safety in its estimates. Results: Aimed at these estimates, a database with 168 reinforced concrete beams with stirrups was assembled, all of which broke through shear by diagonal traction, and established parameters and relationships between them to improve the safety of the beams, rationalizing the sizing and stipulating the ultimate strength. Conclusion: A formulation is presented to estimate this resistance based on the NBR 6118 (2023) standard and a statistical analysis of the safety parameters for the minimum armature calculation by the standard and the proposed formulation, comparing the performance and reliability of each model.
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Lima et al. (2025) studied this question.
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