Stress-strain state of a reinforced stepped bimodular column

Abstract The article discusses the reinforced stepped column under the action of forces applied along its axis. The column is clamped at the ends and made of a bimodular material, that is, a material having different elastic moduli in tension and compression. Formulas for normal stresses are obtained, depending on the mechanical characteristics of the column material, the geometrical values of the column, and the reinforcement bars. Numerical calculations were carried out for a column made of fibro-foam concrete, in which the elastic modulus of tensile strength is greater than the elastic modulus of compression. The influence of different modulus of the material on the stressed state of the column in the compressed and stretched parts was investigated. The graphs of the normal stresses as a function of the number of reinforcement bars of the stretched zone with a constant number of reinforcement bars in the compressed zone with and without bimodularity are given. It is shown that in some cases normal tensile stresses without bimodularity are 46% less than with bimodularity, and compressive normal stresses are 29% more than with bimodularity.