The object of study is flexural reinforced concrete elements without transverse reinforcement under the action of shear forces. The calculation of reinforced concrete beams for shear is a complex problem, and its formulas are obtained by experimental or semi-empirical methods on the basis of various theoretical calculation models. In Russian standards, the calculations of reinforced concrete structures under the action of shear forces are performed based on the length of the most dangerous projection of the inclined section on the longitudinal axis of the element, and the formulas lack parameters that would take into account the influence of longitudinal reinforcement on the strength of inclined sections. The novelty of the present research is that the author, based on the theory of Prof. A.S. Zalesov, proposed a new approach to determine the shear strength of inclined sections of elements reinforced without stirrups. In the new approach, an analytical expression is obtained that takes into account the work of longitudinal regular reinforcement by introducing a longitudinal reinforcement coefficient. Examples of calculations performed according to the proposed methodology and SP 63.13330.2018 are given, where a series of experimentally tested specimens are taken for comparative calculation. The results of comparative calculations have shown the adequacy of the new approach to determine the strength of inclined sections of reinforced concrete elements reinforced without stirrups.

Keywords: reinforced concrete beam, beams without stirrups, inclined crack, shear stress, normal stress, strength, shear force