Estimate of elasticity module in glulam beams for static and dynamic methods

Abstract

This study aimed to establish a model of linear equation to estimate the true elasticity module, the glulam beams, from the elasticity module of the layers by the method of Stress Wave Timer and composition of beams by the classification of  layers. The work was developed, using pieces of saw wood of Pinus taeda and adhesive melamine urea formaldehyde. The beam fabrication process concerned the classification of the pieces, correction machining and layers formation, as well as the assemblage and pressurization of the beams. The assays, nevertheless, involved the determination of the elasticity module through the Stress Wave Timer and through the use of a machine of assays. The results were analyzed through the regression analysis for the establishment of the equation of adjusting the correlation. It was concluded that the classification system used to select pieces was insufficient to obtain the maximum values of the modulus of elasticity; the positioning of lamellas through the method of dynamic classification had as a consequence the medium increase of the module; and the regression model was not suitable for the establishment of predictions of the real elasticity module of beams.