Study of the Shear Performance of Glulam Joints Using Mechanical Connectors and Self-Tapping Screws

摘要

Two types of mechanical connectors, of either steel or aluminum, were developed with the application of self-tapping screws for Japanese cedar glulam member connections. The characteristic strength properties of a beam-column joint assembled using different numbers of self-tapping screws in an H-type structure were studied using a shear test. For the n-type connector, connections that used 9 and 12 self-tapping screws showed a slight improvement in the maximum shear loading capacity over the use of 6screws. Connections assembled using a dovetail-type connector exhibited greater initial stiffness and ductility than the Tt-type connector, but had a lower maximum load capacity and yield strength. Joints assembled using the aluminum dovetail-type connectors dissipated energy 3 times more effectively than those assembled using steel dovetail-type connectors. The derived allowable shear capacity values for a connection, obtained from the strength limit, were lower than values derived using yield strength criteria and were about 28.5-32.5% of the average maximum shear load. The 7t-type connection showed a 42.4% higher allowable shear load capacity than that of dovetail-type connections.