Resumo

JUAREZ-ALVARADO, C. A. et al. Theoretical-experimental behavior of steel fibers as a partial replacement for shear reinforcement in reinforced concrete beams. Rev. ALCONPAT [online]. 2021, vol.11, n.3, pp.31-49.  Epub 21-Jun-2022. ISSN 2007-6835.  https://doi.org/10.21041/ra.v11i3.548.

It is proposed to partially replace the stirrups with steel fibers and thus improve the shear strength of concrete beams. The variables studied were: water/cement ratios (w/c) = 0.55 and 0.35, and fiber volume (Vf) = 0, 0.3, 0.5, 0.7% and 0, 0.2, 0.4, 0.6% respectively, along with the separation of the stirrups. The results showed that the shear strength of the reinforced fiber and stirrups was greater than the strength of the beams reinforced only with stirrups. Experimental data and the strength prediction models comparison showed that the analytical models adequately predict the effect of the w/c ratio, the Vf, and the contribution of longitudinal and transverse steel. Also, the studied models predicted mainly conservative values with respect to the ultimate shear strength.

Palavras-chave : Fiber-reinforced concrete; beams; shear strength; analytical model; stirrups; steel fibers..