Mechanical properties of fiber-reinforced polymer rebar and bond behavior between the fiber-reinforced polymer rebar and concrete are highly related to rib parameters, including rib depth and rib spacing. Therefore, rib parameters should be taken into account when fiber-reinforced polymer bars are used as the structure reinforcement. In this article, the tensile properties of glass-fiber-reinforced polymer rebars with different rib depths and rib spacings are tested. The influences of different rib depths and rib spacings on the bond behavior between glass-fiber-reinforced polymer rebar and concrete are investigated by pull-out test. Experimental results show that the rib depth has a distinctive effect on the ultimate tensile strength, elastic modulus, and ultimate elongation of glass-fiber-reinforced polymer rebar. The tensile strength and elastic modulus of glass-fiber-reinforced polymer rebar with shallow rib are remarkably higher than those of glass-fiber-reinforced polymer bars with deep rib. However, compared with the glass-fiber-reinforced polymer bars with shallow rib, the glass-fiber-reinforced polymer bars with deep rib contribute larger bond strength with concrete. Besides, the bond strength and basic anchorage length are predicted by taking rib depth and rib spacing into account. A modified Bertero–Popov–Eligehausen model is adopted to simulate the bond stress–slip behavior, and the ascending branch of bond stress–slip curve expressed by rib depth and rib spacing is also proposed. The calculated results are in good agreement with the test ones.

中文翻译：

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筋参数对纤维增强聚合物钢筋混凝土力学性能和粘结性能的影响

纤维增强聚合物钢筋的力学性能以及纤维增强聚合物钢筋与混凝土之间的粘结行为与肋参数高度相关，包括肋深度和肋间距。因此，当使用纤维增强聚合物钢筋作为结构增强件时，应考虑肋参数。在本文中，测试了具有不同肋深和肋间距的玻璃纤维增​​强聚合物钢筋的拉伸性能。通过拉拔试验研究了不同筋深和筋间距对玻璃纤维增​​强聚合物钢筋与混凝土结合性能的影响。试验结果表明，肋骨深度对玻璃纤维增​​强聚合物钢筋的极限抗拉强度、弹性模量和极限伸长率具有显着影响。浅肋玻璃纤维增​​强聚合物钢筋的拉伸强度和弹性模量显着高于深肋玻璃纤维增​​强聚合物钢筋。然而，与浅肋玻璃纤维增​​强聚合物钢筋相比，深肋玻璃纤维增​​强聚合物钢筋与混凝土的结合强度更大。此外，通过考虑肋深度和肋间距来预测粘结强度和基本锚固长度。采用改进的 Bertero-Popov-Eligehausen 模型模拟了粘结应力-滑移行为，并提出了用肋深和肋间距表示的粘结应力-滑移曲线的上升分支。计算结果与试验结果吻合较好。