TEST RESULTS FOR A BEAM MANUFACTURED USING 3D PRINTING WITHOUT TRANSVERSE REINFORCEMENT.

Abstract

The article presents the methodology and results of testing beams manufactured using 3D printing without transverse reinforcement, as well as the comparison of the obtained experimental findings with theoretical calculations. To achieve this, two experimental samples of beams with longitudinal reinforcement in lower tensile zone of the cross-section were manufactured using a construction 3D printer. The article describes the manufacturing methodology and presents the technological and design drawings. The beams had a total length of 1700 mm, an effective span of 1440 mm, and a cross-section 100 mm wide and 160 mm high. The methodology of beam testing is described, and the layout and image of the laboratory test stand are presented. A total of fourteen clock-type microindicators measured concrete deformation: six in the inclined section and eight in the normal section. Two microindicators measured reinforcement deformation by attaching directly to the bars. The deflection of the beams was measured using three clock-type indicators located at midspan and above the supports. As a result of the experiment, the failure mode of the beams and the ultimate load were determined, and the graphs of deflections and strains in the normal and inclined sections were presented. In accordance with the Ukrainian building codes, a theoretical calculation of the beams was performed and compared with the experimental results.