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- W4366162512 abstract "Experimental studies have shown that the use of steel fiber reinforced concrete increases the punching strength of concrete slabs, due to the capacity of steel fibers to bridge residual tensile stresses across the shear crack. Despite this, there is a lack of simple and accurate design formulations capable of providing substantiated explanations for the experimentally observed behavior of steel fiber reinforced concrete slabs subjected to concentrated loads. In this paper, a previously developed model for the shear and punching strength of conventional reinforced concrete, namely “Multi-Action Shear Model”, has been extended to shear punching of steel fiber reinforced concrete slabs without shear reinforcement. The contribution of fibers to the punching strength is accounted for by including the vertical component of the residual stresses transferred along the critical shear crack. Such residual stress accounts for the volume, geometry and resistant characteristics of the fibers, and for the tensile strength provided by the concrete matrix. In addition, the residual stress is affected by a size factor to account for the effects of the slab depth on the efficiency of the steel fibers. The results of the model have been compared with the experimental results of 94 tests available in the literature, obtaining a mean value and a coefficient of variation of 1.10 and 0.12, respectively. Moreover, the robustness of the model has been demonstrated through a study of sensitivity in front of the dimensions of the slab and the support, the amount of longitudinal reinforcement, the strength of the concrete, the volume and the residual tensile stress of the fibers, having detected little influence of these parameters on the mean value and scatter of the results." @default.
- W4366162512 created "2023-04-19" @default.
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- W4366162512 date "2023-06-01" @default.
- W4366162512 modified "2023-09-30" @default.
- W4366162512 title "Mechanical model for the shear-punching strength of steel fiber reinforced concrete slabs under concentric loading" @default.
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- W4366162512 doi "https://doi.org/10.1016/j.istruc.2023.04.035" @default.
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