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Steel and Composite Structures
  Volume 49, Number 5, December 10 2023 , pages 571-585

Experimental investigation of the influence of fibre content on the flexural performance of simply supported and continuous steel/UHPC composite slabs
Sirui Chena, Phillip Visintin and Deric J. Oehlers

    The application of relatively low volumes of fibres in normal strength concrete has been shown to be of significant benefit when applied to composite slabs with profiled sheet decking. This paper reports on an experimental study aimed at quantifying further potential benefits that may arise from applying ultra-high performance fibre reinforced concrete. To assess performance six simply supported beams were tested under hogging and sagging loading configurations along with three two span continuous beams. Fibre contents are varied from 0% to 2% and changes in strength, deformation, crack width and moment redistribution are measured. At the serviceability limit state, it is shown that the addition of high fibre volumes can significantly enhance member stiffness and reduce crack widths in all beams. At the ultimate limit state it is observed that a transition from 0% to 1% fibres significantly increases strength but that there is a maximum fibre volume beyond which no further increases in strength are possible. Conversely, member ductility and moment redistribution are shown to be strongly proportional to fibre volume.
Key Words
    composite profile slab; crack width; flexural strength; moment redistribution; UHPFRC
Sirui Chena, Phillip Visintin and Deric J. Oehlers:School of Architecture and Civil Engineering, University of Adelaide, Adelaide, SA 5005, Australia

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