Abstract
The shear failure in a concrete beam is a brittle type of failure. The addition of steel fibers in a plain concrete mix helps to bridge and restrict the cracks formed in the brittle concrete under applied loads, and enhances the ductility of the concrete. In this research an attempt was made to investigate the behavior and the ultimate shear strength of hooked end steel fiber reinforced concrete beams without traditional shear reinforcement. Four simply-supported reinforced concrete beams with a shear span-to-depth ratio of about 3.0 were tested under two-point loading up to failure. Steel fibers volumetric fractions that used were 0.0, 0.5, 0.75 and 1.0%. Test results indicated that using 1.0% volume fraction of hooked steel fiber led to exclude shear failure and enhanced the use of steel fibers as shear reinforcement in concrete beams. The results also showed that a concrete beam with hooked steel fiber provided higher post-flexural-cracking stiffness, an increase in the shear capacity and energy absorption and an increase in the maximum concrete and steel reinforcement strains.
Highlights
The prediction of the shear behavior and ultimate shear strength in a steel fiber reinforced concrete (SFRC) beam involves various factors and is complicated
The effects of the shear span-to-effective depth ratio on shear behavior of SFRC beams have been extensively studied by various researchers
The main conclusions, which can be extracted from the experimental test of SFRC beams exposed to shear force, are:
Summary
The prediction of the shear behavior and ultimate shear strength in a steel fiber reinforced concrete (SFRC) beam involves various factors and is complicated. Yoo and Yang (2018) [14] presented an investigation on the effectiveness of using a percentage of steel fiber and minimum amount of shear reinforcement on the shear behavior of various sized reinforced high-strength reinforced concrete beams Based on their experimental work results, Morsy and El-Raki (2018) [15] concluded that the addition of 0.75% steel fiber content in the SFRC beams without shear stirrups is sufficient to achieve the ultimate shear resistance that is the same as the conventional reinforced concrete member with steel stirrups. Test results indicated that the minimum shear reinforcement of high strength concrete beams was effectively eliminated by adding only a small amount of steel fibres (≥ 0.25 vol%). The performance of the SFRC beams was benchmarked against the behavior of the control beam
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