DETERMINATION OF CONCRETE CLASS OF RC BEAMS BY VIBRATION-DAMPING COEFFICIENT

Abstract

The article considers the possibility of using the vibration-damping coefficient to determine the concrete class of reinforced concrete beams without prestressing reinforcement in the elastic stage of work. It is proposed to use this parameter as a characteristic that takes into account energy losses in an oscillatory system. It is likely that a change in the class of concrete will have a direct effect on the intensity of the damping of vibrations, since with an increase in the class of concrete the elastic properties of the structure begin to prevail over the plastic ones. Providing the same conditions of support and control of experimental designs, energy losses due to various physical and deforming properties of the products will be fully manifested, and the damping coefficient of vibrations will allow determining these properties with less errors and greater stability compared to ultrasonic or mechanical methods. A method has been developed for determining the class of concrete, based on the use of reference structures and constructing an analytical dependence of the damping coefficient of vibrations on the class of concrete. For the studied type and size of reinforced concrete structures, a smaller error in determining the class of concrete is obtained in comparison with known methods.