Ribbed carbon fiber reinforced polymer (CFRP) bars in ultra-high-performance fiber reinforced concrete (UHPFRC) are a high-efficiency combination for its sustainable substitute and high strength to weight ratio. This paper aims to investigate the bond stress and development length of ribbed CFRP bar embedded in UHPFRC using the hinged beam test. A total of 12 groups of hinged beam specimens were tested with different parameters, such as bar type (ribbed CFRP, sand coated CFRP, ribbed glass fiber reinforced polymer (GFRP), and steel bar), bonded length (4$d_b$, 10$d_b$, 20 $d_b$, and 40 $d_b$), fibers (with and without fibers in ultra-high-performance concrete (UHPC)), and presence of shear reinforcement for assessing the bonding behavior and development length of each bar. Tensile failure occurred in the steel, ribbed GFRP, and ribbed CFRP bars with bonded lengths of 10$d_b$, 20$d_b$, and 40$d_b$, respectively, and pullout failure occurred in sand coated CFRP bars regardless of bonded length. The ultimate load for the bonded length of 10 $d_b$ was in order of ribbed CFRP, ribbed GFRP, steel, and sand coated CFRP bars. Compared with the bonded length, the bond stress of ribbed CFRP bars is larger than that of the ribbed GFRP and sand coated CFRP bar and these trends became more remarkable as the bonded length increased. There was no difference in the bond stress with presence of the reinforcement cage, and the bond stress increased by 20 % when the fibers were incorporated. The code-based equation for development length of ribbed CFRP bar was found to be underestimated, and ribbed CFRP, sand coated CFRP, ribbed GFRP bar of development length was proposed as 24$d_b$, 20$d_b$, and 107$d_b$.

超高性能纤维增强混凝土 (UHPFRC) 中的带肋碳纤维增强聚合物 (CFRP) 棒因其可持续替代品和高强度重量比而成为高效组合。本文旨在通过铰接梁试验研究嵌入 UHPFRC 中的带肋 CFRP 筋的粘结应力和展开长度。共对 12 组铰接梁试件进行了不同参数的测试，如钢筋类型（带肋 CFRP、喷砂 CFRP、带肋玻璃纤维增​​强聚合物 (GFRP) 和钢筋）、粘结长度（4$d_{乙}$, 10$d_{乙}$, 20$d_{乙}$，和 40$d_{乙}$）、纤维（超高性能混凝土 (UHPC) 中含有和不含纤维），以及用于评估每个钢筋的粘合行为和展开长度的抗剪钢筋的存在。钢、带肋 GFRP 以及粘合长度为 10 的带肋 CFRP 钢筋发生拉伸破坏$d_{乙}$, 20$d_{乙}$，和 40$d_{乙}$分别，并且无论粘合长度如何，涂砂 CFRP 条都会发生拉拔失效。粘合长度为 10 时的极限载荷$d_{乙}$按顺序为带肋 CFRP、带肋 GFRP、钢和喷砂 CFRP 棒。与粘结长度相比，带肋CFRP筋的粘结应力大于带肋GFRP和喷砂CFRP筋的粘结应力，并且随着粘结长度的增加，这种趋势变得更加明显。存在钢筋笼时，粘结应力没有差异，并且当掺入纤维时，粘结应力增加了 20%。发现基于规范的CFRP肋筋展开长度方程被低估，建议CFRP肋筋、涂砂CFRP、GFRP肋筋的展开长度为24$d_{乙}$, 20$d_{乙}$和 107$d_{乙}$。