RESEARCH OF THE WORK OF PRE-STRESSED WOODEN BEAMS MADE OF GLUELAMMED WOOD

It was established that the increase in stiffness allows for an increase in the overlap spans, which in turn will make it possible to save materials. Therefore, options for reinforcement, as well as options for prestressing wooden bending elements, were developed. There was a planned set of tests of wooden reinforced and unreinforced beams with prestressing and without prestressing from solid and glued wood. The work describes experimental and theoretical studies of the work of pre-stressed wooden beams. The method of prestressing and the methodology of conducting experimental studies are described. The results of experimental studies of pre-stressed wooden glulam beams compared with the results of its numerical simulation. The article presents "moment-curvature" and "moment-deformation (deflection)" graphs for experimental and numerically simulated data. The change in the stress-strain state of the cross-section of the sample under study is described and the nature of its destruction is depicted. A comparison of experimental data and data obtained by theoretical numerical modeling of deformation diagrams "moment - curvature" and "moment - deflection" for pre-stressed wooden beams made of glulam with combined reinforcement is carried out. The results of the numerical simulation showed a good agreement with the experimental ones. Deviation of experimental data from theoretically determined deflections is within 10%.