Shear Behavior of Ultra-High-Performance Concrete Shear Pockets with Large-sized Studs in Full-Depth Precast Concrete Bridge Deck under Push-off Tests

Krissachai Sriboonma, Nantawat Khomwan, Krit Chaimoon, Kittipoom Rodsin

Abstract

Full-Depth Precast Concrete (FDPC) bridge deck panel system has been widely used for highway construction due to its rapid construction and replacement process as well as cost effective. This system was used with a cluster of large size headed-stud shear connectors (31.8 mm diameter) for transferring composite actions between concrete decks and steel girders. For more effectiveness in composite actions and cracks controlling around a cluster of large-size studs, Ultra High-Performance Concrete (UHPC) with compressive strength of 120 MPa was utilized for shear pocket connection between the normal strength concrete (NSC) 50 MPa bridge deck panels and steel girders. Eight specimens were push-off evaluated with variable geometries and layouts of shear pockets (9-, 12- and 15-inches width), and variable numbers of clustered large-size studs (4, 6 and 8 studs). The results showed three stages of crack pattern from the flexure, shear, and failure behaviors. Concrete crushing at the FDPC interface propagated across the slab section was observed in all specimens, while the shear plane cut at the UHPC section was found in the specimen with 4 studs. The shear strength at failure was compared to the nominal shear resistance of the design equations, AASHTO LRFD and Eurocode 4, in terms of the failure load ratio. The compatible results were found in the specimens with 4 studs in a square shape pocket, while the others found fewer results from 3.6% to 9.4%. The specimens with more than 4 studs required a reduction factor of 0.8 for each stud pair increment to evaluate a suitable shear resistance capacity for this system.

Keywords

References

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DOI: 10.14416/j.asep.2025.12.003

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