United States Department of Transportation
i
Strength and Fatigue Resistance of Clustered Shear Stud Connectors in Composite Steel Girders
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2019-11-01
[PDF-15.07 MB]
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Edition:Final Report
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Abstract:Accelerated bridge construction (ABC) is a technique in which large bridge elements are fabricated offsite or next to the site and are then connected onsite to complete the bridge. One such ABC method is the use of full depth precast (PC) concrete deck panels, which are placed on top of steel girders connected via shear studs. The PC concrete deck panels typically have pockets cast into them so that they fit around the shear studs. These pockets are then filled with grout to form the composite connection with the girder. When using PC deck panels, it is beneficial to place the shear studs in clusters (i.e., close together longitudinally and transversely). The clusters of studs can then be spaced at greater distances apart. By reducing the number and size of the pockets in the PC concrete deck panels, panel fabrication and constructability can be simplified. Large- and small-scale fatigue and static tests were conducted in this study to evaluate the American Association of State Highway and Transportation Officials (AASHTO) fatigue, strength, and spacing design provisions for shear studs. The large-scale tests in this study were constructed with PC concrete deck panels and steel beams. Twelve shear studs were used in each shear span but were spaced at intervals of 1, 2, 3, and 4 ft between specimens. The small-scale tests were similar to historical tests and served as a comparison between the historical small-scale test data and the current large-scale tests. Results of the study showed that the AASHTO shear stud-fatigue design provisions can be overly conservative, requiring more studs than are necessary. Testing also showed that the AASHTO shear stud-strength design provisions overpredict a shear stud's strength, making them unconservative. The results also demonstrated that the AASHTO shear stud-spacing requirements can be relaxed to allow for details more conducive to using PC concrete deck panels. Proposed alternative design provisions for the fatigue, strength, and spacing of shear studs are included.
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Content Notes:The Contracting Officer's Representative was Fassil Beshah (HRDI-40), Mark Swanlund (HRDI-1), or Justin Ocel (HRDI-40), depending on the contract.
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