To investigate the bond performance between glass fiber reinforced polymer (GFRP) ribbed bars and concrete and improve the practicality of existing constitutive models, 14 sets of specimens were prepared for beam-end tests, which aimed to explore the influences of concrete strength, thickness of cover, stirrup configuration and the interaction between GFRP ribbed bars on the bond performance. The tests were conducted using displacement-controlled loading; loading force, free end slip value, and loading end slip value were recorded, the failure mode of the bond interface was observed, and a method for proposing 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 and splitting failures; 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 of stirrups would affect the failure mode and damage degree of the bond interface, thereby affecting bond-slip performance; the increase in cover thickness 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 the GFRP ribbed bars in the specimens. The simplified bond-slip constitutive model can accurately fit the test data and further enhance the practicality of the constitutive model.