The Limiting Values of Moments And Deformations Ratio in Strength Calculations Using Specified Material Diagrams

The authors compare the results of calculating bent reinforced concrete elements strength and deformations using specified concrete and reinforcement diagrams with different outlines and analytical relationships between deformations and stresses with experimental data in the article. In order to improve the deformation calculation methods, the energy laws of the deformation mechanics of solids are used in the proposed technique. From the energy standpoint, concrete and reinforcement in the section under load are stored with potential energy, according to the diagram outline used in the calculation; a stress diagram is formed in the com-pressed zone concrete. A connection is established between the efforts in concrete and the work spent on the deformations of concrete sample (prism, cylinder) under the load numerically equal to the area used in calculating the specified diagram. Flat cross-section hypothesis is applied in the derivation of the resolving balance equations. The condition of balanced forces in an element section is checked by the method of successive approximation. Element curvature is assumed as a variable approximation parameter.