This paper examines the experimental performance of ultra-high-performance steel fibre-reinforced concrete (UHPSFRC) beams subjected to loads at relatively low shear span-to-depth ratios. The results and observations from six tests provide a detailed insight into the ultimate response including shear strength and failure mode of structural elements incorporating various fibre contents. The test results showed that a higher fibre content results in an increase in ultimate capacity and some enhancement in terms of ductility. Detailed nonlinear numerical validations and sensitivity studies were also undertaken in order to obtain further insights into the response of UHPSFRC beams, with particular focus on the influence of the shear span-to-depth ratio, fibre content and flexural reinforcement ratio. The parametric investigations showed that a reduction in shear span-to-depth ratio results in an increase in the member capacity, whilst a reduction in the flexural reinforcement ratio produces a lower ultimate capacity and a relatively more flexible response. The test results combined with those from numerical simulations enabled the development of a series of design expressions to estimate the shear strength of such members. Validations were performed against the results in this paper, as well as against a collated database from previous experimental studies.

中文翻译：

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超高性能钢纤维增强混凝土构件的极限剪切响应

本文研究了超高性能钢纤维增强混凝土（UHPSFRC）梁在相对较低的剪跨深度比下承受载荷的实验性能。六个测试的结果和观察结果提供了对最终响应的详细了解，包括结合了各种纤维含量的结构元件的抗剪强度和破坏模式。测试结果表明，较高的纤维含量会导致极限承载力的增加和延展性的提高。为了获得对UHPSFRC梁响应的进一步了解，还进行了详细的非线性数值验证和敏感性研究，尤其关注剪切跨度-深度比，纤维含量和抗弯增强比的影响。参数研究表明，剪切跨度与深度之比的减小会导致构件承载力的增加，而抗弯增强比的减小则会导致极限承载力的降低和相对灵活的响应。测试结果与数值模拟相结合，可以开发出一系列设计表达式来估算此类构件的抗剪强度。针对本文的结果以及先前实验研究的整理数据库进行了验证。测试结果与数值模拟相结合，可以开发出一系列设计表达式来估算此类构件的抗剪强度。针对本文的结果以及先前实验研究的整理数据库进行了验证。测试结果与数值模拟相结合，可以开发出一系列设计表达式来估算此类构件的抗剪强度。针对本文的结果以及先前实验研究的整理数据库进行了验证。