Review article

The characteristics of concrete used for calculations of reinforced concrete structures operating under complex stress state are determined on models that are mainly empirical, and the coefficients included in them are obtained from test data, which are often contradictory. The behavior of concrete under the action of compressive stresses is most studied, which is reflected in the current regulatory documents. Meanwhile, the stressed states associated with the simultaneous action of tension are presented in the regulatory framework in a much smaller volume.This fully applies to biaxial tension. It is proposed to consider the issue of changing the strength of concrete based on a model in which the elements of the structure are distributed according to a normal law. The initial data can be obtained from tests of concrete for strength under axial compression and tension. The analysis of the obtained results confirms the operability of the applied model. The performed study indicates a decrease in the strength of concrete under biaxial tension. The decrease is more significant for concretes of low strength classes.