Calculation of Overreinforced Concrete Bending Elements Based on Modern Models for Deformation of Materials

The paper considers the methods of calculating overreinforced normal cross-sections of reinforced concrete bending elements. Overreinforced elements have an interesting characteristic: at the destruction point, the stress in the tension reinforcement does not reach the yield point, which determines the utilization of certain assumptions when using engineering methods for calculating such elements. In particular, in simplified engineering models, one constant value of bearing capacity is obtained when a certain percentage of reinforcement is exceeded, which can lead to certain errors in the design of such elements. The article evaluates the errors in determining the bearing capacity of overreinforced concrete bending elements using various calculation methods for different classes of concrete and reinforcement. The article considers in detail the following calculation methods: a nonlinear deformation model with an extreme criterion; a non-linear deformation model with constant boundary values of deformations of compressed concrete; a method of design resistance of reinforced concrete; engineering methods based on simplified deformation diagrams. The assessment was carried out on the basis of the design resistance of reinforced concrete under bending, which makes it possible to assess not individual elements, but a whole range of elements with the same reinforcement. The article shows the possibility of using the proposed engineering methods to calculate overreinforced normal cross-sections of reinforced concrete bending elements. below.