DETERMINING AN INITIAL MODULUS OF ELASTICITY OF CONCRETE ACCORDING TO THE MAIN FREQUENCY OF CONCRETE BEAMS
Statement of the problem. The possibility of evaluating the initial modulus of elasticity of concrete in reinforced concrete beams without reinforcement stress according to the results of dynamic tests in the elastic stage of the operation is considered. Results. A method for determining the initial modulus of elasticity of concrete for the main oscillation frequency of concrete beams based on mathematical formulas is developed. The error of the proposed method is shown, an experiment in the field of reinforced concrete constructions beams 2 PB 26-4 is performed and the mathematical formulas are corrected based on the results of experimental studies. Conclusions. The results of the research confirmed the possibility of determining the initial modulus of elasticity of concrete in reinforced concrete beams at the fundamental frequency of the transverse and longitudinal oscillations. A smaller error is obtained while determining the initial modulus of elasticity of concrete using the measured frequency of the longitudinal oscillations of concrete beams.