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Materials and Structures

, 52:1 | Cite as

Biaxial bending of SFRC slabs: Is conventional reinforcement necessary?

  • Marco di Prisco
  • Matteo Colombo
  • Ali Pourzarabi
50 years of Materials and Structures
  • 81 Downloads
Part of the following topical collections:
  1. 50 years of Materials and Structures

Abstract

Fibre reinforced concrete shows enhanced performance in statistically redundant bi-dimensional structural elements that undergo biaxial bending. However, the lack of reinforcing rebars in fibre reinforced structural elements may affect the structural ductility which may further affect the overall load bearing capacity of these structures. To investigate the influence of fibres in such elements, six concrete plates of 2000 × 2000 × 150 mm reinforced with steel fibres and/or reinforcing rebars are tested under a central concentrated load. Two of the elements are reinforced with only 35 kg/m3 of steel fibres, two are reinforced with 2-way conventional reinforcing rebars (35 kg/m3, in each direction) and two are reinforced with both steel fibres and rebars. The specimens are simply supported at the middle of each side by means of a bilateral restraint; the deflection response and cracking behaviour of all the specimens are recorded and compared. Moreover, the methodology introduced in the fib Model Code 2010 for design of steel fibre reinforced concrete is implemented to predict the ultimate load bearing capacity of these elements and its reliability is determined in comparison with the experimental values. The comparison of the behaviour of the specimens reinforced only with steel fibres, with those reinforced with steel rebars, shows the higher efficiency of steel fibres in terms of load carrying capacity, but with a lower ductility. The combination of steel fibres and rebars allows for a better exploitation of the capacity of both reinforcement solutions. Finally, the reliability of the approach implemented for the ultimate load prediction is shown and the need of rebars in providing ductility in fibre reinforced concrete members is underlined.

Keywords

Biaxial bending Reinforcement efficiency Fibre reinforced concrete Slabs Serviceability and ultimate behaviour Ductility 

Notes

Acknowledgements

The authors express their gratitude to the financial support provided by Steriline, Magnetti Building, and Finazzi Company and the technical support provided by DSC-Erba. The authors are also grateful to the assistance of Mr. Andrea G. Stefanoni for his contribution in carrying out the experiments.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© RILEM 2018

Authors and Affiliations

  1. 1.Department of Civil and Environmental EngineeringPolitecnico di MilanoMilanItaly

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