Shear Strength of Joints in Glued Laminated Timber: Normative Verification of Bibliography Results

Abstract

Wood has long been used by man for a wide range of purposes, including the production of furniture, civil construction and structural elements. Aiming the construction industry, the use of glued laminated timber proves to be an excellent alternative to constructive technology, allowing the production of elements with different shapes and sizes. It is important that the bonded wood presents resistance to the stresses imposed on its use. This way, the present study aims to make a comparative analysis of shear strength values of Glued Laminated Timber (also called glulam) through the analysis of studies done by several authors that used different types of wood and adhesives. The results found by these authors were verified based on the ASTM-D-5751 and the Brazilian standard ABNT NBR 7190. It was concluded that the glued joints analyzed obtained satisfactory resistance according to the American standard. However, the majority did not comply with the parameters required by the Brazilian standard.

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“…The shear strength of bonded joints in wood has significant variability across wood species and testing conditions, thus experimental results are not easily reproducible. According to Chahud et al, 37 the shear strength of bonded joints with polyvinyl adhesive in wood is between 2 and 10 MPa, the results are presented in Table 2. The adhesive bond strength using polyvinyl adhesive remains lower than the epoxy bond strength, but is in the interval of strengths for bonded wood joints.…”