The Parameters Ratio in the Strength of Bent Elements Calculations by the Deformation Model and the Ultimate Limit State Method

Abstract

The relations between the deformation parameters and the forces in the normal section of the bent elements with the actual stress profile in the concrete compressed zone and the conventional rectangular stress profile shape of the limit stress method in the limiting state when the stress in the reinforcement is equal to the calculated resistance are determined in the article. The actual parameters in a normal section of a reinforced concrete element are calculated by a nonlinear deformation model using numerical methods of successive approximation using normalized diagrams of concrete and reinforcement according to domestic and foreign regulatory documents. The relations between the parameters in the limiting state are defined according to equality condition of the resultant efforts in the concrete compressed zone with the actual and rectangular stress plots depending on concrete diagrams used in calculations. Recommendations and suggestions are given on the use of the calculated dependencies of determining the compressed zone boundary height in strength calculations using the method of limiting efforts under the effect of the moment in the plane of symmetry of the section for concrete classes, including high-strength concrete.