The ultra-high-performance concrete (UHPC) and fiber-reinforced polymer (FRP) are well-accepted high-performance materials in the field of civil engineering. The combination of these advanced materials could contribute to improvement of structural performance and corrosion resistance. Unfortunately, only limited studies are available for shear behavior of UHPC beams reinforced with FRP bars, and few suggestions exist for prediction methods for shear capacity. This paper presents an experimental investigation on the shear behavior of UHPC beams reinforced with glass FRP (GFRP) and prestressed with external carbon FRP (CFRP) tendons. The failure mode of all specimens with various shear span to depth ratios from 1.7 to 4.5 was diagonal tension failure. The shear span to depth ratio had a significant influence on the shear capacity, and the effective prestressing stress affected the crack propagation. The experimental results were then applied to evaluate the equations given in different codes/recommendations for FRP-reinforced concrete structures or UHPC structures. The comparison results indicate that NF P 18-710 and JSCE CES82 could appropriately estimate shear capacity of the slender specimens with a shear span to depth ratio of 4.5. Further, a new shear design equation was proposed to take into account the effect of the shear span to depth ratio and the steel fiber content on shear capacity.

超高性能混凝土（UHPC）和纤维增强聚合物（FRP）是土木工程领域公认的高性能材料。这些先进材料的组合有助于提高结构性能和耐腐蚀性。不幸的是，对于用 FRP 钢筋加固的 UHPC 梁的剪切行为只有有限的研究，并且很少有关于抗剪能力预测方法的建议。本文介绍了用玻璃 FRP (GFRP) 增强和用外部碳 FRP (CFRP) 预应力筋增强的 UHPC 梁的剪切行为的实验研究。具有从 1.7 到 4.5 的各种剪切跨度与深度比的所有试样的破坏模式是对角拉伸破坏。剪跨深度比对抗剪承载力有显着影响，有效预应力影响裂纹扩展。然后将实验结果应用于评估 FRP 钢筋混凝土结构或 UHPC 结构的不同规范/建议中给出的方程。比较结果表明，NF P 18-710 和 JSCE CES82 可以适当地估计剪跨深度比为 4.5 的细长试样的剪切能力。此外，还提出了一个新的剪切设计方程，以考虑剪切跨度与深度比和钢纤维含量对剪切能力的影响。比较结果表明，NF P 18-710 和 JSCE CES82 可以适当地估计剪跨深度比为 4.5 的细长试样的剪切能力。此外，还提出了一个新的剪切设计方程，以考虑剪切跨度与深度比和钢纤维含量对剪切能力的影响。比较结果表明，NF P 18-710 和 JSCE CES82 可以适当地估计剪跨深度比为 4.5 的细长试样的剪切能力。此外，还提出了一个新的剪切设计方程，以考虑剪切跨度与深度比和钢纤维含量对剪切能力的影响。