为研究GFRP(Glass Fiber Reinforced Polymer)带肋筋与混凝土之间的粘结性能并改进已有本构模型的实用性，制作了14组试件进行梁端式试验，探讨混凝土强度、保护层厚度、配置箍筋以及GFRP带肋筋之间相互作用对粘结性能的影响。试验采用位移控制加载方式，对加载力、自由端滑移值和加载端滑移值进行了测试记录，观察了粘结界面的破坏情况，并基于试验结果提出了简化粘结-滑移本构模型的方法。试验结果表明：梁端式试验主要发生拔出破坏和劈裂破坏；粘结-滑移曲线的滑移值与肋间距有关，波峰间距基本与肋间距一致；混凝土强度和配置箍筋会影响粘结界面的破坏模式和损坏程度，进而影响粘结滑移性能；保护层厚度增加对粘结滑移性能的有利影响在一定范围内有效；二次拉拔试验结果表明试件中GFRP带肋筋的粘结性能存在相互影响。简化后粘结-滑移本构模型在能够较好地拟合试验数据的基础上进一步增强了实用性。

To investigate the bond performance between glass fiber reinforced polymer (GFRP) ribbed bars and concrete, and to improve the convenience of using the existing constitutive model, 14 sets of specimens were prepared for beam-end tests, The tests aimed to explore the influence of concrete strength, thickness of cover, stirrup configuration and GFRP ribbed interaction on the bond performance. The tests were conducted using displacement-controlled loading, and loading force, free end slip value, and loading end slip value were recorded, The failure mode of the bond interface was observed, and a simplified bond-slip constitutive model was proposed based on the test results. The results showed that the beam-end tests mainly resulted in pull-out failure and splitting failure; The slip value of the bond-slip curve was related to the rib spacing, and the peak spacing was essentially consistent with the rib spacing; Concrete strength and Configuration stirrup would affect the failure mode and damage degree of the bond interface, thereby affecting the bond slip performance; The increase in thickness of cover had a beneficial effect on the bond slip performance within a certain range; The results of the second pull-out test showed that there was a mutual influence on the bond performance of GFRP ribbed bars in the specimens. The simplified bond-slip constitutive model was able to accurately fit test data and further enhance the practicality of the constitutive model.

国家自然科学基金（52078201）