In this paper, a strut-and-tie model is
proposed for predicting the ultimate shear capacity of
steel fiber reinforced concrete corbels. The proposed
strut-and-tie model accounts for the effect of concrete
strength, fiber volume, fiber aspect ratio, ratio of main
steel and horizontal stirrups ratio, horizontal load ratio
and shear span-to-depth ratio. The ultimate shear
predictions of the proposed model are validated with
146 test results from the literature. The comparison
shows that the proposed model performs well in
predicting the ultimate shear capacity of steel fiber
reinforced concrete corbels. The overall average value
of the ratio between the experimental and the
predicted strengths is 1.1 and the standard deviation
is 0.105. Compared with the existing testing results,
the strut-and-tie model predictions of the American
and the British standard are more conservative than the
improved strut-and-tie model. Also, comparative
studies between the proposed model and the strutand-tie models provided by other researchers in the
literature are presented. Finally, sensitivity studies are
performed for fiber parameters. The ratio between the
ultimate shear strength for steel fiber reinforced concrete corbels and the ultimate shear strength for
non-fibrous corbels are studied versus the steel fiber
parameters considering shape of fiber and shear spanto-depth ratio. The studied fiber parameters are fiber
volume content and fiber aspect ratio. |
