PREDICTVE ANALYTICAL MODEL FOR WOOD CAPACITY OF RIVET CONNECTIONS IN GLULAM AND LVL

摘要

Timber rivets are hardened nails with a rectangular cross section for making connections with high load transfer capacity, high stiffness and more ductility. Rivets are a cost effective alternative to large fasteners such as bolts which cause large localized stresses and force brittle ruptures in the timber. Rivets are part of the Canadian and U.S. structural wood design standards. However, in the current standards there is no closed form solution for the wood strength prediction. Also, the standards restrict the use of rivets to specific configurations and for glulam and sawn timber of some limited species. A simple close-form analytical method to determine the resistance of wood in rivet connection in timber products is proposed. For the wood strength, the stiffness and strength of the planes subjected to shear and tension stresses are taken into account. An algorithm is presented which allows the designer to predict the different possible brittle, ductile and mixed failure modes. Results of tests on New Zealand Radiata Pine LVL and glulam and data available from literature confirm the validity of this new method and show that the proposed analytical method can be used as design provision for timber riveted connections.