Deformation Models of Concrete Strength Calculation in the Edition of Russian and Foreign Norms

The correlation between the calculation models as amended by Russian and foreign regulatory documents is established by comparing the values of the integral parameters of the diagrams and the ultimate forces obtained by calculating the reinforced concrete element according to the deformation model. As integral parameters of concrete deformation diagrams, it is recommended to use the areas of the areas limited to the branches of diagrams and coefficients of plenitude of diagrams. Mathematical models have been developed that establish a common form for calculating the unambiguous values of deformations at the base points of concrete diagrams, taking into account the accepted functional relationships and the rules for their use according to the tables of normative documents. Analytical modeling of integral parameters allows us to exclude from the calculation of the strength of an element the procedure for numerically summing stresses along elementary strips in a section and solving nonlinear equations by successive approximations.