United States Department of Transportation
i
Larger-Diameter Shear Studs for Composite Steel Bridges
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2023-10-31
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[PDF-58.17 MB]
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Edition:January 2020 – October 2023
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Abstract:Composite steel bridge girders are typically constructed using 7/8″ diameter shear studs. A large number of shear studs is often needed to satisfy AASHTO shear stud fatigue and strength requirements. Using a larger diameter shear stud can significantly reduce the required number of shear studs which in turn can improve construction worker safety, expedite the girder fabrication process, and facilitate the use of partial depth precast concrete deck panels (PCPs). The overall objective of this research project was to evaluate the feasibility of shear stud diameters greater than 7/8″ for composite steel bridge construction. The research initially considered both 1-1/8″ and 1-1/4″ diameter shear studs, but the majority of testing and finite element analysis ultimately focused on 1-1/8″ studs. The research considered the use of 1-1/8″ studs in two types of bridge deck systems. The first was a deck constructed using 8.5″ full-depth cast-in place (CIP) concrete. The second was a deck constructed using 4″ thick precast concrete deck panels (PCPs) with a 4.5″ CIP concrete topping. The research included preliminary design studies to quantify the reduction in the number of shear studs that can be achieved with larger-diameter shear studs. The reduction in the number of shear studs was found to be significant when larger-diameter shear studs are used. Compared to 7/8″ shear studs, the reduction in the number of studs was found to be on the order of 40%, and 50% for 1-1/8″ and 1-1/4″ diameter shear studs, respectively.
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