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.

中文翻译：

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钢纤维高强混凝土抗剪承载力贡献与无箍筋比较

本研究介绍了由 0.75%（体积）的钩状钢纤维或不同间距的剪切箍筋加固的环保高强度混凝土 (HSC) 梁的抗剪能力。测试和研究了五个带有钢纤维或箍筋的大型 HSC 梁的抗剪能力、破坏模式和裂纹模式。试验结果表明，所有五根试验梁最终都以剪切临界破坏模式失效，并且在没有箍筋的情况下，使用 0.75 vol% 的钢纤维显着提高了剪切强度，尽管它降低了 HSC 梁的对角裂纹角. 与 ACI 318-19 建议相比，有一些不同的特性，但与 HSC 梁的最小抗剪钢筋相比，使用 0.75 vol% 钢纤维的抗剪强度高出约 13.2%。此外，通过实验数据计算了钢纤维的抗剪能力，并将其与几个预测方程进行了比较。包含纤维因子的预测模型与测试结果更接近，差异最小为 10.9%。