Abstract
This study presents the shear capacity of eco-friendly high-strength concrete (HSC) beams reinforced by 0.75% (by volume) of hooked steel fibers or shear stirrups with various spacings. Five large-scale HSC beams with steel fibers or stirrups were tested and investigated with respect to shear capacity, failure mode, and crack patterns. The test results indicate that all five tested beams finally failed by a shear-critical failure mode and that the use of 0.75 vol% of steel fibers significantly improved the shear strength although it decreased the diagonal crack angle of HSC beam in the case of without stirrups. There are some different properties compared with ACI 318-19 recommendation, but the use of 0.75 vol% steel fibers exhibited approximately 13.2% higher shear strength when compared with that of minimum shear reinforcement for the HSC beam. Furthermore, the shear capacity of steel fibers calculated by experimental data, and it was compared with several prediction equations. The prediction models containing fiber factor were more closely agreeable with test results with a minimum of 10.9% difference.
Highlights
In the context of the fourth industrial revolution, more and more emphasizes the using environmental friendly construction methods and sustainable materials
4 Conclusions An experimental investigation was performed to evaluate the shear behavior of high-strength concrete (HSC) beams with different reinforcements
Five large-scale reinforced HSC beams were tested under four-point loading
Summary
In the context of the fourth industrial revolution, more and more emphasizes the using environmental friendly construction methods and sustainable materials. A few studies investigated and verified the feasibility of replacing the minimum shear reinforcement with steel fibers in normal and high strength concrete (Yoo et al 2017). The authors investigated the feasibility of eliminating the minimum shear reinforcement in reinforced sustainable high strength concrete beams by using 0.75 vol% of hooked steel fibers under a flexural bending test. Shear properties of eco-friendly high strength concrete containing 60% GGBFS and reinforced by steel fiber, based on the structural point of view, still needs further investigation. It is necessary to perform a quantitative evaluation and investigate the shear behavior of hooked steel fiber reinforced HSC beam under a larger-scale size test. To calculate shear strength of HSC reinforcement with steel fibers using prediction equation, a simple three-point flexural bending test was proposed based on RILEM TC 162-TDF (2000a). The test was performed by using a 50 kN UTM with displacement control at a rate of 0.4 mm/min (Fig. 2b)
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