Étude expérimentale et numérique d'un nouveau goujon hybride bois-aluminium pour les assemblages bois

Authors: Rollo, Guillaume
Advisor: Oudjene, MarcFafard, Mario
Abstract: The assembly of timber elements is mostly done with steel fasteners, but some scientific studies are trying to conduct these assemblies towards a design integrating more wood. The use of compressed wood dowels has shown the efficiency of the densification process on the wood material to improve the resistance of wood member connections compared to a wood dowel connection. The mechanical characteristics of this new connection are promising according to the AFTB (Adhesive Free Timber Buildings) research group but remain inferior in terms of stiffness and ductility when compared to a similar steel dowel connection. Thus, the present study investigated a solution to confine a compressed wood dowel in an aluminum tube to improve the mentioned mechanical characteristics. A prototype of hybrid wood-aluminum dowel was manufactured and tested in three points bending. The comparison with the compressed wood dowel showed a clear improvement of the strength and stiffness characteristics as well as a gain in ductility through the restraint of the brutal rupture of the compressed wood dowel by the aluminum envelope. Double shear tests were also conducted with densified wood, hybrid, and steel connectors to allow the identification of parameters necessary for the creation of a numerical model with the objective of optimizing the design of the hybrid wood-aluminum prototype. This model allowed studying different hybrid designs and to show that with a 1 mm envelope, the hybrid dowel brought to the assembly a much better resistance and rigidity than the compressed wood dowel but still less than half in comparison to a steel dowel of the same diameter. However, the improvement of the model is still necessary to allow the numerical study of the failure modes of the hybrid dowel.
Document Type: Mémoire de maîtrise
Issue Date: 2021
Open Access Date: 20 December 2021
Permalink: http://hdl.handle.net/20.500.11794/71253
Grantor: Université Laval
Collection:Thèses et mémoires

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