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Study on shear and pull-out behaviors of ultra-short headed stud connectors in ultra-thin UHPC
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DOI：10.1016/j.istruc.2026.112349.png)
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Abstract
En 中文
With the increasingly use of ultra-high performance concrete (UHPC) in composite bridges, the aspect ratio of the headed stud connectors trends to be smaller due to high strength and excellent durability of UHPC. In this paper, to facilitate the application of ultra-thin steel-UHPC lightweight composite deck structures, a concept of using ultra-short headed stud connectors was proposed. In this new structure, the UHPC is only 35 mm thick and is connected to the steel deck plate via headed studs with sizes of φ13 × 24 mm or φ16 × 24 mm, with the aspect ratio of 1.8 and 1.5, respectively. To verify the applicability of ultra-short headed stud connectors in UHPC, experimental tests were carried out: nine push-out specimens and eleven pull-out specimens were tested separately. According to the test results, the response of the ultra-short headed stud connectors in UHPC was systematically obtained and analyzed. The push-out test results show that the failure mode of the ultra-short headed stud connectors was the fracture of stud shank, while the UHPC layer only developed minimal damage around the stud root position. Based on the test results, formulas were proposed to predict the shear strength, load-slip curve, and shear stiffness for the ultra-short headed stud connectors in UHPC. Further, the pull-out test results show that the failure mode of the pull-out specimens were all characterized by failure of UHPC, while the ultra-short headed stud connectors were intact, and the failure surface look like cones. The influence of stud diameter and stud height on pull-out capacity of ultra-short headed stud connectors was obtained. Further, formulas were proposed to predict the pull-out capacity, load-separation curve, and shear stiffness for ultra-short headed stud connectors in UHPC.
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