Experimental investigation of mechanical properties of A-III reinforcing steel bars with a diameter of 10 mm

Abstract

This paper presents the results of an experimental investigation into the mechanical properties of A-III reinforcing steel bars with a diameter of 10 mm intended for use in reinforced concrete structures. The study was carried out prior to testing reinforced concrete beams in order to determine the actual strength and deformation characteristics of the reinforcing steel used in the experimental program. Tensile tests were performed in accordance with the requirements of GOST 1497–84 using a universal testing machine. During the experiments, the maximum tensile load, ultimate tensile strength, yield strength, relative elongation, plasticity coefficient, and coefficient of variation were determined. The average values of the ultimate tensile strength, yield strength, and relative elongation were found to be 485 MPa, 405 MPa, and 23.165%, respectively. The experimental results were compared with the requirements of GOST 34028–2016 and demonstrated full compliance with the prescribed mechanical performance criteria. The coefficient of variation did not exceed 3.4%, confirming the high homogeneity and reliability of the investigated reinforcing steel. The obtained results indicate that the tested reinforcement possesses high strength, sufficient ductility, and stable deformation characteristics, making it suitable for application in flexural reinforced concrete elements subjected to static loading. The research findings can be used in the design, analysis, and experimental assessment of reinforced concrete structures and provide reliable reference data for evaluating the load-bearing capacity and serviceability of structural members.