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首页> 美国卫生研究院文献>Materials >Impact of Reinforcement Ratio on Shear Behavior of I-Shaped UHPC Beams with and without Fiber Shear Reinforcement
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Impact of Reinforcement Ratio on Shear Behavior of I-Shaped UHPC Beams with and without Fiber Shear Reinforcement

机译：配筋率对带或不带纤维剪力的工字型UHPC梁剪力性能的影响

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摘要

In the presented paper, the impacts of steel fiber use and tensile reinforcement ratio on shear behavior of Ultra-High Performance Concrete (UHPC) beams were investigated from the point of different tensile reinforcement ratios. In the scope of the experimental program, a total of eight beams consisting of four reinforcement ratios representing low to high ratios ranged from 0.8% to 2.2% were casted without shear reinforcement and subjected to the four-point loading test. While half of the test beams included 30 mm end-hooked steel fibers (SF-UHPC) with 2.0 vol%, the remaining beams were produced without the fiber to show possible effectiveness of the fiber use. The shear performances were discussed in terms of the load—deflection response, cracking pattern and failure mode, first cracking load and ultimate shear strength. In this sense, all the non-fiber beams were failed by shear with a dramatic load drop, regardless of the tensile reinforcement amount, before the yielding of reinforcement and they produced no deflection capability. The test results showed that while the inclusion of steel fibers to the UHPC mixture with low reinforcement ratios changed the failure mode from the shear to flexure, it significantly enhanced the ultimate shear strength in the case of higher reinforcement ratio through the SF-UHPC’ superior mechanical properties and fibers’ crack-bridging ability.
机译：本文从不同的抗拉增强比角度出发，研究了钢纤维用量和抗拉增强比对超高性能混凝土（UHPC）梁抗剪性能的影响。在实验程序的范围内，铸造了八个横梁，其中四个代表着从0.8％到2.2％的低到高比率的增强比率，并且没有进行剪切增强，并进行了四点载荷测试。虽然一半的测试梁包括30毫米厚的末端钩形钢纤维（SF-UHPC），其含量为2.0％（体积），但其余的梁却是在没有纤维的情况下生产的，以显示出纤维使用的有效性。讨论了剪切性能，包括载荷-挠度响应，裂纹模式和破坏模式，初次裂纹载荷和极限剪切强度。从这个意义上讲，所有非纤维梁在屈服钢筋之前都受到剪切力的破坏而导致载荷急剧下降，而与拉伸钢筋的数量无关，它们都没有挠曲能力。测试结果表明，虽然在低增强比的UHPC混合物中加入钢纤维可以将破坏模式从剪切变为弯曲，但通过SF-UHPC的优越性，在较高增强比的情况下，它可以显着提高极限剪切强度。力学性能和纤维的裂纹桥接能力。

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