Steel and Composite Structures

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Behaviour and design of stainless steel shear connectors in composite beams

  • Yifan Zhou (School of Civil Engineering, The University of Sydney) ;
  • Brian Uy (School of Civil Engineering, The University of Sydney) ;
  • Jia Wang (School of Civil Engineering, The University of Sydney) ;
  • Dongxu Li (School of Civil Engineering, The University of Sydney) ;
  • Xinpei Liu (School of Civil Engineering, The University of Sydney)
  • Received : 2021.07.30
  • Accepted : 2023.01.02
  • Published : 2023.01.25
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Abstract

Stainless steel-concrete composite beam has become an attractive structural form for offshore bridges and iconic high-rise buildings, owing to the superior corrosion resistance and excellent ductility of stainless steel material. In a composite beam, stainless steel shear connectors play an important role by establishing the interconnection between stainless steel beam and concrete slab. To enable the best use of high strength stainless steel shear connectors in composite beams, high strength concrete is recommended. To date, the application of stainless steel shear connectors in composite beams is still very limited due to the lack of research and proper design recommendations. In this paper, a total of seven pushout specimens were tested to investigate the load-slip behaviour of stainless steel shear connectors. A thorough discussion has been made on the differences between stainless steel bolted connectors and welded studs, in terms of the failure modes, load-slip behaviour and ultimate shear resistance. In parallel with the experimental programme, a finite element model was developed in ABAQUS to simulate the behaviour of stainless steel shear connectors, with which the effects of shear connector strength, concrete strength and embedded connector height to diameter ratio (h/d) were evaluated. The obtained experimental and numerical results were analysed and compared with existing codes of practice, including AS/NZS 2327, EN 1994-1-1 and ANSI/AISC 360-16. The comparison results indicated that the current codes need to be improved for the design of high strength stainless steel shear connectors. On this basis, modified design approaches were proposed to predict the shear capacity of stainless steel bolted connectors and welded studs in the composite beams.

Keywords

Acknowledgement

The financial support from Australian Research Council's Discovery Scheme (Project ID: DP180100418) is gratefully acknowledged. The writers would like to thank Outokumpu and Stirlings Performance Steel for the donations of stainless steel plates. A great thanks to Bumax for the generous donations of stainless steel bolted connectors. The writers extend special thanks to Dr. Mohanad Mursi, Mr. Garry Towell and the technicians from J.W.Roderick Laboratory for their assistance and advice. A special thanks to Dr. Zhichao Huang for his valuable advice on developing this paper.

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