Effet de la teneur en humidité du bois sur la performance des assemblages bois boulonnés de pin gris

Authors: Dorval Legras, Baptiste
Advisor: Salenikovich, AlexanderMohammad, Mohammad
Abstract: This research is focused on the effect of moisture on the performance of bolted connections in timber structures. To improve the accuracy of the engineering design of timber structures based on the Canadian standard CSA-O86, we studied the relevance of the service factor (KSF) as applied to the lateral resistance of fastenings in different moisture conditions (MC). To reach this goal, we used five connection configurations assembled with seasoned (MC ≈ 12%) and unseasoned (MC ≥ 19%) timber and tested at various moisture conditions: wet (MC ≥ 19%), dry (MC ≈ 12%) and very dry (MC ≈ 8%). All connections were 89-mm thick jack pine (Pinus banksiana) sawn lumber and 6.4-mm thick steel side plates assembled with 12.7-mm diameter bolts of grade 2 and, in some cases, of grade 5. The joints included one, two or six bolts; in the latter, the fasteners were installed in two rows with various spacing between the rows and between the bolts in a row. Each series consisted of six specimens, with a joint at both ends, with a total of 198 tests in tension parallel to grain of wood in double shear. The following parameters were determined from each test: proportional limit, yield point, maximum load, stiffness, ductility and failure mode. Results of the study revealed that it was moisture content at test and not at the time of assembly that influenced the performance of the tested connections the most. The stiffness increased in direct proportion with the decrease of moisture content below the fibre saturation point, which was accompanied with a transition from ductile to brittle failure. Connections assembled and tested unseasoned (MC > 19%) were the weakest but the most ductile. Seasoning had the highest effect on the connections with the minimum spacing of fasteners within and between the rows: not only were they the most brittle, their load capacity was reduced 15% in very dry conditions (MC ≈ 8%). The reduction of load capacity of connections in very dry conditions was observed; yet for brittle failure modes, the service factor KSF was found to be overly conservative. Proposals are put forward and justified to replace the KSF by service condition factors in longitudinal shear and tension (KSv and KSt) in case of brittle failure modes, which is the current recommended practice in the US National Design Specification.
Document Type: Mémoire de maîtrise
Issue Date: 2009
Open Access Date: 16 April 2018
Permalink: http://hdl.handle.net/20.500.11794/21290
Grantor: Université Laval
Collection:Thèses et mémoires

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