Experimental study and prediction model for flexural behavior of reinforced SCC beam containing steel fibers

Abstract

h i g h l i g h t sFibers are added for enhancing the ultimate flexural capacity of reinforced SCC beam. Using steel fibers to partially replace conventional steel rebar is feasible. One large crack developed in pure bending section of SFRSCC beam after yield of steel rebar. The suggested model for estimating ultimate moment of SFRSCC beam agrees well with test data. a b s t r a c tSeven 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.

A Comparative Experimental Study on the Flexural Behavior of High‐Strength Fiber‐Reinforced Concrete and High‐Strength Concrete Beams

“…In addition, the experimental results of exural toughness for the HSFRC beams of this study and those for the similar HSFRC beams of previous studies [21,24,29,30] are compared in Figure 13. It appears that the normalized exural toughness of the HSFRC beams increased with the rebar ratio, and that, similarly to other studies, the normalized exural toughness increased with the rebar ratio in this study.…”

“…e bilinear model shown in Figure 16 was used for rebar. is study Dancygier and Savir [29] Mertol et al [21] Biolzi and Cattaneo [30] Ning et al [24] e sectional force can be calculated with the calculation of stress for each layer. For the H100 and H120 series beams, tensile stresses were ignored in the calculation of the sectional force, but for the HF120 series beams, tensile stresses were considered in this calculation.…”

“…ey reported that the bearing capacity of HSFRC increased with the steel fiber volume dosage. In addition, a flexural analysis of ultra-high-performance concrete beams, which can be regarded as a kind of HSFRC, was suggested by Chen and Graybeal [22], Bae et al [23], and Ning et al [24].…”

Assessment of model error for reinforced concrete beams with steel fibers in bending

“…Owing to high tensile strength and high strain capacity of the RC‐SFRC composite, large deformations in longitudinal steel reinforcements are involved, and consequently, high ductility of the members is achieved . Studies highlight the fact that the moment capacity of RC beams are enhanced by addition of steel fibers . These studies focused to develop a relation between increased flexural capacity with fiber dosage, fiber type, and strength.…”

“…17 Studies highlight the fact that the moment capacity of RC beams are enhanced by addition of steel fibers. 4,12,[18][19][20][21][22][23] These studies focused to develop a relation between increased flexural capacity with fiber dosage, fiber type, and strength.…”