Interstorey Drift Performance of Timber Beam-Hanger Connections
This thesis is split into two distinct sections. The first describes the design of a testing setup for applying simulated earthquake loads to a timber beam-hanger connection, and the second evaluates the performance of beam-hanger connections under this loading protocol. Chapter 2 describes existing testing protocols for subjecting timber connections to cyclic loading. The specific details of the current research are then outlined, including the loading protocol to allow for the application of interstorey drifts, and the details of the two specific beam-hanger connections tested for this research (“dove tail” and “bolted plate”). The structural design of a testing frame is then described and the final product of a steel wide flange section, W460x128, with 10mm plates is detailed. A test was then completed to evaluate the performance of the new testing frame. It was determined that the frame performed adequately by ensuring that the deflections incurred during the loading are primarily experienced by the connections. Chapter 3 describes the laboratory testing of beam-hanger connections under applied interstorey drift deflections. The performance of the connectors was evaluated and it was determined that the Ricon Prototypes exhibited a combined tension and shear fracture of the collar bolts at an average shear of 210 kN and a rotation of 1.33°. The Megant connections failed due to combined tension and pull-out failure of the wood screws, and sustained higher shear, moments and rotations than the Ricon Prototype connections. The interstorey drift values at failure were also compared to the maximum interstorey drift value from the National Building Code of Canada (2.5%) and it was observed that the Megant 310x150 and 550x150 are the only connections that surpassed this value.