TESTING OF A PRECAST BEAM REINFORCED WITH INDIVIDUAL BARS AND MANUFACTURED BY 3D PRINTING

Abstract

The publication is devoted to the testing of single-span beams reinforced with individual rebars without transverse reinforcement and manufactured by 3D printing. The purpose of the study is to test beams reinforced with individual longitudinal rebars without transverse reinforcement and manufactured by 3D printing according to the developed methodology. To accomplish this task, two samples of beams were designed and printed on a 3D construction printer. The article presents the design solutions and working drawings of the samples. The beams were 1700 mm long and 150x100 mm in cross-section. The scheme of the laboratory bench with the marked measuring instruments is presented in the paper. In total, sixteen clock-type micro-indicators with a division price of 0.001 mm were used to determine the deformations of concrete and reinforcement, three clock-type indicators with a division price of 0.01 mm to determine the deflection and settlement of the supports. As a result of the experiment, the fracture pattern of the beam was determined, the value of the critical breaking moment was determined, as well as the nature of the increase in deflections and the increase in deformations of reinforcement, compressed concrete, and in inclined sections.