Abstract
The mechanical characteristics of steel-timber composite (STC) connections play an essential role in the safe and economical design of hybrid STC structures and floor systems. Accordingly, this study investigates the load-slip behaviour of lap Laminated Veneer Lumber (LVL) timber-steel plate composite joints. Push-out tests on four different types of STC lap joints connected by coach screws (with and without a reinforcing nail plate), high-strength bolts and a combination of glued and screwed joints are reported, and the load-slip behaviour and failure modes of the connections are characterised. The use of a nail plate is found to be effective in reinforcing the timber and in increasing the stiffness of STC lap joints with coach screws, but they do not produce a significant improvement in their strength. A non-linear regression is carried out and an empirical load-slip formulation for STC lap joints with coach screws and high strength bolted connectors is proposed in analytical form.
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