Steel and Composite Structures

  • 제33권6호
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  • Pages.823-836
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  • 2019
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Push-out resistance of concrete-filled spiral-welded mild-steel and stainless-steel tubes

  • Loke, Chi K. (Materials and Structures Innovation Group, School of Engineering, The University of Western Australia) ;
  • Gunawardena, Yasoja K.R. (Materials and Structures Innovation Group, School of Engineering, The University of Western Australia) ;
  • Aslani, Farhad (Materials and Structures Innovation Group, School of Engineering, The University of Western Australia) ;
  • Uy, Brian (School of Civil Engineering, The University of Sydney)
  • 투고 : 2019.08.20
  • 심사 : 2019.11.01
  • 발행 : 2019.12.25
⟨ 이전 논문 다음 논문 ⟩

초록

Spiral welded tubes (SWTs) are fabricated by helically bending a steel plate and welding the resulting abutting edges. The cost-effectiveness of concrete-filled steel tube (CFST) columns can be enhanced by utilising such SWTs rather than the more conventional longitudinal seam welded tubes. Even though the steel-concrete interface bond strength of such concrete-filled spiral-welded steel tubes (CF-SWSTs) is an important consideration in relation to ensuring composite behaviour of such elements, especially at connections, it has not been investigated in detail to date. CF-SWSTs warrant separate consideration of their bond behaviour to CFSTs of other tube types due to the distinct weld seam geometry and fabrication induced surface imperfection patterns of SWTs. To address this research gap, axial push-out tests on forty CF-SWSTs were carried out where the effects of tube material, outside diameter (D), outside diameter to wall thickness (D/t), length of the steel-concrete interface (L) and concrete strength grade (f'c) were investigated. D, D/t and L/D values in the range 102-305 mm, 51-152.5 and 1.8-5.9 were considered while two nominal concrete grades, 20 MPa and 50 MPa, were used for the tests. The test results showed that the push-out bond strengths of CF-SWSTs of both mild-steel and stainless-steel were either similar to or greater than those of comparable CFSTs of other tube types. The bond strengths obtained experimentally for the tested CF-SWSTs, irrespective of the tube material type, were found to be well predicted by the guidelines contained in AISC-360.

키워드

과제정보

연구 과제 주관 기관 : University of Western Australia

The authors wish to thank James Ballard, Jim Waters, Brad Rose and Michael Pederson for the help they extended towards conducting the experimental programme. The first and second authors also wish to acknowledge that their research work is supported by the Australian Government Research Training Program (RTP) scholarships. The work described in this paper was financially supported by the University of Western Australia.

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