Seven full-scale steel fiber reinforced self-consolidating concrete (SFRSCC) beams were tested to study
the effects of macro steel fibers on the flexural behavior of reinforced self-consolidating concrete beams.
The major test variables are fiber contents and longitudinal reinforcement ratios. The ultimate load, midspan
deflections, steel reinforcement strains, crack width and crack spacing were investigated. The
enhanced ultimate flexural capacity and reduced midspan deflection due to the addition of steel fibers
were observed. With the increasing of fiber contents, the strain in longitudinal reinforcement, crack
width and crack spacing decreased significantly. The possibility of using steel fibers for partial replacement
of the conventional longitudinal reinforcement is estimated, which is meaningful for extending
the structural application of SFRSCC. A method incorporating fiber contribution to the post-cracking tensile
strength of concrete in the flexural analysis of SFRSCC beam is also suggested. Comparisons are made
between the suggested model and the fib Model Code 2010 model with experimental data. The results
showed that the suggested model can estimate ultimate flexural capacity accurately.National Natural Science Foundation of China: Grants: 51078058 and 51121005
