Numerical analysis of the influence of layer number and thickness on CLT panels under bending

Abstract

In the production of Cross-Laminated Timber (CLT), different geometrical configurations can be adopted. This work analyzed, using Finite Element simulations developed in software Abaqus, the influence of layer geometry in the performance of CLT panels subjected to bending perpendicular to plane and in one direction. The wood was simulated considering an elastoplastic behavior, using the Hill Failure Criterion. The calibration of the simulations was based on experimental results of other authors. Then, the geometry of the panels was changed, varying the number and thickness of the layers, in seven different configurations. The Load x Displacement curves resulted from the simulations were compared and the bending stiffness was calculated using the Mechanically Jointed Beam Theory (Gamma Method). The magnitude and distribution of stress within the panels were also evaluated. Generally, panels with thicker layers oriented in the main direction presented higher bearing capacity and stiffness. A tendency for higher rolling shear stresses was observed on the panels with thicker layers perpendicular to the main direction. The work that was carried out, within its limitations, made it possible to analyze the influence of the layer geometry on the behavior of the CLT panels, therefore fulfilling the research objectives.