Shear strength of joints of pinus sp. bonded with epoxy adhesive and broken under compression and torsion

Abstract

Among the existing construction systems, Glues Laminated Timber stands out as a structural product. In this system, wood veneers are arranged in such a way that their fibers are parallel and bonded together using adhesives. Epoxy adhesive is a two-component thermosetting polymer formulated with resin, which can be used to bond various materials in civil construction. In this context, the research evaluated the strength of joints made of Pinus sp. wood, bonded with epoxy resin, at different angles. The joints were created at angles of 0°, 10°, 20°, 30°, 45°, 60°, 70°, 80°, and 90°, and subjected to shear tests under compression and torsion. Based on regression analysis, the Hankinson formula proved effective in estimating the shear strength values under compression, returning a coefficient of determination (R²) of 0.89. However, for shear under torsion, the model was not effective, showing a low R². The specimens subjected to compression showed distinct mechanical response compared to those subjected to torsion.