Statistical analysis of the stiffness of glulam beams made with pinus wood bonded with RS 216-M resin based on ABNT NBR 7190-1:2022

Abstract

This article examines the bending stiffness (EI) of glued laminated timber (glulam) beams made of Pinus wood, using analytical modeling, experimental test and numerical simulation to validate the formulations of the Brazilian standard NBR 7190-1 (ABNT, 2022a). The study was conducted with Pinus C30 wood, with lamella bonded by resorcinol-formaldehyde adhesive. The tests compared the bending stiffness estimates derived from analytical equation and proposed by the aforementioned standard and numerical simulations in the ANSYS software with experimental data, applying the Tukey test to determine the statistical significance of the differences. The results showed that both analytical verification and numerical simulations provided predictions close to experimental values, with discrepancies less than 10% in terms of mean absolute percentage error, thus validating the effectiveness of normative formulations for the design of glulam beams. The study confirmed the suitability of Pinus wood for use in structural applications in civil construction.