CONNECTIONS DESIGN AND ITS LOAD-CARRYING CAPACITY FOR POST AND BEAM JOINTS OF LARCH GLULAM

摘要

In the research, larch glulam post and beam joints with steel plate connectors, bolts and pins were designed and its load-carrying capacity was evaluated. Firstly, the half-hole dowel embedding properties tests of larch glulam and dimension lumber were conducted and the impact of density and diameter on the dowel embedding properties were analysed. Secondly, assembling with glulam, steel plate, bolts or pins, then lateral load tests of connections with doweled wood-steel plate-wood were conducted with load parallel and perpendicular to the grain and lateral load tests with the bolted steel plate-wood-steel plate were conducted with load parallel to the grain. The proportional limit load, yield load, yield strength, stiffness and other parameters were obtained from above lateral load tests and the failure modes were recorded respectively. Furthermore, a finite element model was applied to investigate the mechanical performance of dowel joints affected by the various parameters. Finally, compression load was applied to to evaluate the load -carrying capacity of post and beam joints assembled with different type steel connector plates(U-pIate type and T-plate type) , bolts, pins and so on respectively. From the test results the load -carrying capacity of U-plate type connector was better than that of T-plate type one while the load ductility of T-plate type connector was better than that of U-plate type one. The stress and finite element analysis of different plates connectors of joints were done to get the optimized connectors for post and beam joints of larch glulam.