Designing, modelling and testing of joints and attachment systems for the use of OSB in upholstered furniture frames

Authors: Wang, Xiao Dong
Advisor: Salenikovich, AlexanderMohammad, Mohammad; Zhang, Jilei
Abstract: The objective of the study was to develop the information needed for the engineered design of joints used in upholstered frames constructed of OSB. Presented are three levels of tests: 1) material level, including interaction of material/fasteners (screw and staple), 2) joints level (gusset-plate and metal-plate), and 3) modeling of a sofa frame made of OSB. First, tests of basic material properties of OSB, MDF and PB, and localized density effecting on fastener holding capacities in wood-based panels under static and cyclic loading were examined. Results showed that in both static and cyclic loads, OSB had the highest density variation in plane and through thickness, which was more critical to the screw than to the staple holding capacities. The density of MDF panels varied the least, leading to a more uniform fastener holding capacity. Second, in-plane and out-of-plane moment capacities of OSB gusset-plate and metal-plate joints with different configurations were determined under static and fatigue loads. Results indicated that application of glue was the most important factor affecting the performance of the joints. An increase in length of gusset-plate from 102 to 203-mm (4 to 8-in) increased the peak load for both glued and unglued joints. For metal-plates, the use of two pairs of plates was the most important factor that affected the performance of the joints. For fatigue tests, the average values of 2.1 and 2.5 can be used as the passing static-to-fatigue ratio for design of upholstered furniture frames with OSB gusset-plate and metal-plate joints, respectively. In general, in-plane moment capacities were found to be 4 to 6 times higher than out-of-plane moment capacities for both metal-plate and gusset-plate joints. Finally, three configurations of three-seat sofa frame made of OSB with two types of joints under three levels of service acceptance loads were modeled using the finite element program SAP2000. The results demonstrated that the sofa frame model can pass light-service acceptance level load; there is the limit to pass medium-service acceptance level load; and it could not serve the heavy-service acceptance level load.
Document Type: Thèse de doctorat
Issue Date: 2007
Open Access Date: 13 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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