Abstract
Self-drilling screw is an efficient and cost-effective connection method for lightweight structural members. In this work, the performance of self-drilling screw connections for fibre reinforced polymer (FRP) structural members was investigated, considering the application for joining FRP plates to square hollow sections (SHS). To understand the resistance to pull-out loads, pull-out experiments were conducted on connection specimens consisting of FRP plates joined to FRP SHS at a right angle. The specimens were prepared with difference in pultrusion direction of the FRP plate, screw gauge size, and coarseness of screw threads. The specimens with the pultrusion direction oriented transversely in the FRP plates exhibited a flexural failure of the plates and the lowest connection strength. The other specimens with the pultrusion direction oriented longitudinally in the FRP plates failed by the screws pulled out from the FRP SHS profiles. The increase in screw gauge size and thread coarseness was found beneficial to the ultimate connection strength. A simplified analytical equation was developed to estimate the strengths of the specimens with longitudinal pultrusion direction in the FRP plates.
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