Abstract A combination of fiber-reinforced polymer (FRP) reinforcing bars and steel fibers can be employed in locations of a structure with reinforcement congestion instead of the conventional combination of steel rebars and stirrups. In this study, first, the shear performance of the FRP bar-reinforced concrete beams containing steel fibers and crumb tire rubber without shear reinforcement was evaluated, and then an analytical model was proposed to predict their shear capacity and achieve a relationship between the first cracking moment and the shear capacity. Furthermore, an empirical equation was derived from the experimental data of 30 beams of the present research together with a database extracted from the results reported in other research to calculate the share of concrete in the shear capacity of this type of beam. Through evaluating the proposed equation against those given by different codes and those developed by other researchers, it was revealed that most existing shear strength prediction equations give an underestimated value for this parameter in beams having FRP reinforcing bars, while the present equation provides more accurate results. These results make the proposed model suitable for accurately designing FRP bar-embedded concrete beams containing steel fibers and crumb tire rubber.

中文翻译：

---

玻璃纤维增​​强聚合物 (GFRP) 钢筋增强钢纤维橡胶混凝土梁剪切行为的预测

摘要 在钢筋拥挤的结构位置，可以采用纤维增强聚合物（FRP）钢筋和钢纤维的组合代替传统的钢筋和箍筋组合。本研究首先对含钢纤维和碎胎胶的 FRP 钢筋混凝土梁的抗剪性能进行了抗剪性能评估，然后提出了一种分析模型来预测它们的抗剪能力，并获得了第一次开裂之间的关系。力矩和抗剪承载力。此外，从本研究的 30 根梁的实验数据以及从其他研究报告的结果中提取的数据库导出了一个经验方程，以计算混凝土在此类梁的抗剪承载力中的份额。通过对照不同规范给出的公式和其他研究人员开发的公式评估所提出的公式，发现大多数现有的抗剪强度预测公式在具有 FRP 钢筋的梁中给出了该参数的低估值，而本公式提供了更准确的结果. 这些结果使所提出的模型适用于精确设计包含钢纤维和碎胎橡胶的 FRP 钢筋预埋混凝土梁。