United States Department of Transportation
i
Durability of the Grouted Shear Stud Connection at Low Temperatures
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2019-05-01
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[PDF-5.53 MB]
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Edition:Final Report, May 2016 through May 2019
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Abstract:The grouted shear stud (GSS) connection for steel bridge substructures was developed as a ductile alternative to directly welded column to cap-beam connections. The GSS connection utilizes plastic hinge relocation to eliminate brittle cracking at the weld region and provides full strength and ductility capacity for steel bridge columns. However, the grout material used as part of the GSS connection is susceptible to damage through years of exposure, especially in extremely cold climates. This report presents the study conducted to evaluate the durability of the GSS connection in cold climates. First, a series of experiments was performed to ascertain the durability of commonly available high-strength cementitious grouts. While there were grouts that exhibited good durability, inconsistencies in results within the same grout were observed. Next, four large scale tests were performed on two-column steel bridge bents to determine the consequences of grout deterioration in the GSS connection. Results indicate that grout deterioration is unlikely to compromise the structural integrity of the connection. The large scale experimental data was then used to determine the predominant force transfer mechanism in the GSS connection. The socket depth of the connection was found to be a crucial factor for successful plastic hinge relocation.
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