The slip resistance is a critical factor influencing high strength bolted joint behaviour in steel structures under repeated loading. The surface condition of the connected steel components, also known as the faying surface, controls the level of the slip resistance. Design standards, such as the Canadian Highway Bridge Design Code CAN/CSA S6-06 and the American Institute of Steel Construction (AISC) specifications, specify desired conditions for faying surfaces and associated slip coefficients for design purposes. Currently, these standards do not address faying surface conditions that are metallized, although steel bridge components are widely metallized to provide long-term protection against wear and corrosion. This compels steel bridge fabricators to mask off all faying surfaces before metallizing, a practice that is labour-intensive, time-consuming and costly. In this study, the resistance of slip-critical joints in steel bridges with metallized faying surfaces are characterized in the light of the CAN/CSA-S6-06 standard. The mean slip coefficient is determined from a compression test regime and for varying parameters of coating thickness, surface conditions, and bolt preload.
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