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首页> 外文期刊>Magazine of Concrete Research >Flexural and shear behaviour of high-strength SFRC beams without stirrups
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Flexural and shear behaviour of high-strength SFRC beams without stirrups

机译：无箍筋的高强度SFRC梁的弯曲和剪切特性

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摘要

This study investigates the effects of steel fibre content and reinforcement ratio on the flexural and shear behaviours of sustainable high-strength concrete (HSC) beams without stirrups. Five different volume fractions of hooked steel fibres, V-f, 0, 0.25, 0.5, 0.75, and 1%, and two different reinforcement ratios, rho, 0.72 and 2.93%, were considered. Test results indicated that the minimum shear reinforcement of HSC beams was effectively eliminated by adding only a small amount of steel fibres (= 0.25 vol%). This amount was much smaller than the minimum requirement of the ACI 318 code. For the lightly reinforced HSC beams, the load-carrying capacity and post-cracking stiffness were improved by adding steel fibres and increasing their amount, whereas the ultimate deflection decreased with the addition of fibres because of the cracking localization phenomenon. For the heavily reinforced HSC beams, the first-cracking load, load-carrying capacity, and deflection capacity all increased with the addition of steel fibres and increasing their amount up to 0.75%. Finally, based on the comparison of experimental and predictive results, Craig's model and Narayanan's and Kwak's models were determined as the best predictive models for the factored flexural and shear strengths of reinforced HSC and steel-fibre-reinforced concrete beams without stirrups, respectively.
机译：本研究研究了钢纤维含量和增强比对无箍筋的可持续高强度混凝土（HSC）梁的弯曲和剪切性能的影响。考虑了五种不同的钩状钢纤维体积分数V-f，0、0.25、0.5、0.75和1％，以及两种不同的增强比例rho，0.72和2.93％。测试结果表明，仅添加少量的钢纤维（> = 0.25 vol％）即可有效消除HSC梁的最小抗剪钢筋。该数量远小于ACI 318代码的最低要求。对于轻度增强的HSC梁，通过添加钢纤维并增加其数量可以提高承载能力和开裂后刚度，而由于开裂局部化现象，最终挠曲随添加纤维而减小。对于高度加固的HSC梁，随着钢纤维的添加，首次开裂荷载，承载力和挠曲力都增加，并且其量增加至0.75％。最后，基于实验结果和预测结果的比较，分别确定了Craig模型和Narayanan模型和Kwak模型分别为无箍筋的钢筋HSC和钢纤维增强混凝土梁的抗折抗剪强度的最佳预测模型。

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