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.