Volume 25 Issue 5
Oct.  2025
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LI Cong, MAO Qing-chao, HU Wen-xu, CHEN Bao-chun. Shear test on interface of steel-UHPC composite slab with hybrid connection of headed stud and adhesive[J]. Journal of Traffic and Transportation Engineering, 2025, 25(5): 278-296. doi: 10.19818/j.cnki.1671-1637.2025.05.019
Citation: LI Cong, MAO Qing-chao, HU Wen-xu, CHEN Bao-chun. Shear test on interface of steel-UHPC composite slab with hybrid connection of headed stud and adhesive[J]. Journal of Traffic and Transportation Engineering, 2025, 25(5): 278-296. doi: 10.19818/j.cnki.1671-1637.2025.05.019

Shear test on interface of steel-UHPC composite slab with hybrid connection of headed stud and adhesive

doi: 10.19818/j.cnki.1671-1637.2025.05.019
Funds:

National Key R&D Program of China 2018YFC0705400

Special Support Project of China Postdoctoral Science Foundation 2023T160138

Research Start-up Fund of Fujian University of Technology GY-Z23239

Key Project of the Education and Scientific Research of Fujian Province Department of Education for Young Teachers JZ240040

More Information
  • Corresponding author: CHEN Bao-chun (1958-), male, professor, PhD, baochunchen@fzu.edu.cn
  • Received Date: 2025-01-25
  • Accepted Date: 2025-08-25
  • Rev Recd Date: 2025-07-05
  • Publish Date: 2025-10-28
  • With the type of connectors and the diameter and number of headed studs as the parameters, 19 push-out tests were conducted. The interface failure mode, load-slip curve, and load-strain curve were investigated. The shear combination effect and slip mechanism of headed studs and adhesives were analyzed, and the method for calculating the shear bearing capacity and the shear-slip prediction model were established. Test results show that the load-slip curve of the specimen with hybrid connection of headed stud and adhesive can be divided into elastic section, descending section (adhesive failure), elastic-plastic section, and descending section (stud fracture failure). The adhesive primarily bears the load before the adhesive failure, and the headed stud has little effect, which is similar to the specimen with the fully adhesive connection. After adhesive failure, the load is resisted by the headed studs, exhibiting an elastic-plastic section and descending section similar to the specimen with fully headed stud connection. The failure mode is characterized by debonding of adhesive from the steel slab interface, with tearing occurring along the lower edge of the shear pocket. The headed studs are all characterized by shear failure at the base. For the calculation method of shear bearing capacity established in consideration of the synergistic effect of the headed stud and adhesive, the ratio of the calculated value and the experimental value is 0.93, with a variance of 0.13, indicating that the method can predict the shear bearing capacity of the hybrid connector with reasonable accuracy. The interface shear performance of the steel-ultra-high performance concrete (UHPC) slab with hybrid connection of headed stud and adhesive is mainly determined by the headed stud, when the shear bearing capacity ratio of headed studs to adhesives is 2.26-4.91. A certain bearing capacity reserve without reduction in the shear stiffness can be provided when the adhesive fails. According to the shear-slip mechanism of the hybrid headed stud-adhesive connector, the models for exponential function prediction before adhesive failure and for inverse proportional function prediction after adhesive failure were established. They can provide reference for practical projects.

     

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