Steel and Composite Structures

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Direct shear behavior of concrete filled hollow steel tube shear connector for slim-floor steel beams

  • Hosseinpour, Emad (Department of Civil and Structural Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia) ;
  • Baharom, Shahrizan (Department of Civil and Structural Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia) ;
  • Badaruzzaman, Wan Hamidon W. (Department of Civil and Structural Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia) ;
  • Shariati, Mahdi (Faculty of Civil Engineering, University of Tabriz) ;
  • Jalali, Abdolrahim (Faculty of Civil Engineering, University of Tabriz)
  • Received : 2017.04.14
  • Accepted : 2017.12.14
  • Published : 2018.02.25
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Abstract

In this paper, a hollow steel tube (HST) shear connector is proposed for use in a slim-floor system. The HST welded to a perforated steel beam web and embedded in concrete slab. A total of 10 push-out tests were conducted under static loading to investigate the mechanical behavior of the proposed HST connector. The variables were the shapes (circular, square and rectangular) and sizes of hollow steel tubes, and the compressive strength of the concrete. The failure mode was recorded as: concrete slab compressive failure under the steel tube and concrete tensile splitting failure, where no failure occurred in the HST. Test results show that the square shape HST in filled via concrete strength 40 MPa carried the highest shear load value, showing three times more than the reference specimens. It also recorded less slip behavior, and less compressive failure mode in concrete underneath the square hollow connector in comparison with the circular and rectangular HST connectors in both concrete strengths. The rectangular HST shows a 20% higher shear resistance with a longer width in the load direction in comparison with that in the smaller dimension. The energy absorption capacity values showed 23% and 18% improvements with the square HST rather than a headed shear stud when embedded in concrete strengths of 25 MPa and 40 MPa, respectively. Moreover, an analytical method was proposed and predicts the shear resistance of the HST shear connectors with a standard deviation of 0.14 considering the shape and size of the connectors.

Keywords

Acknowledgement

Supported by : Ministry of Higher Education of Malaysia (MOHE), Universiti Kebangsaan Malaysia (UKM)

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