Journal of Northeastern University(Natural Science) ›› 2024, Vol. 45 ›› Issue (11): 1604-1611.DOI: 10.12068/j.issn.1005-3026.2024.11.011

• Resources & Civil Engineering • Previous Articles     Next Articles

Shear Performance of Headed Studs in UHPC Containing Small Coarse Aggregates

Yan WANG1(), Zhe-chao WANG2, Chang-hao LI3, Peng CUI4   

  1. 1.School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China
    2.Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,Shenyang 110819,China
    3.CCCC Highway Consultants Co. ,Ltd. ,Beijing 100088,China
    4.Beijing Urban Construction Design and Development Group Co. ,Ltd. ,Beijing 100045,China.
  • Received:2023-05-29 Online:2024-11-15 Published:2025-02-24
  • Contact: Yan WANG
  • About author:WANG Yan, E-mail: wangyan2@mail.neu.edu.cn

Abstract:

With the increasing span of steel-UHPC lightweight composite girders and the horizontal shear force in girders, the design of shear performance of headed studs in the lightweight composite girders becomes increasingly critical. The shear performance of headed studs between steel and UHPC with small coarse aggregates is studied via standard push?out specimens. The load?slippage behavior and failure mode of standard specimens are revealed, and the calculation methods for shear stiffness and capacity of single headed stud are proposed. Test results show that the failure mode of specimens is that the roots of headed studs are cut off. The failure slippage range of the push?out specimen is between 0.5~1.2 mm, and the ultimate shear strength of the single headed stud is 400.7 MPa. Theoretical calculation results show that according to existing design specifications, the shear stiffness is designed safely at the half failure load or the slippage of 0.2 mm. The design shear capacity of the single headed stud is calculated in the range of 95.51~129.20 kN, which was only 62.7%~84.8% of the test results. Therefore, when designing headed studs for UHPC deck panels with small coarse aggregates, the shear stiffness should consider a reduction coefficient of 0.57~0.73, and the shear capacity should not be reduced.

Key words: composite structure, headed stud, ultra?high performance concrete, shear stiffness, shear capacity

CLC Number: