CALIBRATION OF THE GFRP-CONCRETE COHESIVE MATERIAL LAW USING PULL-OUT TESTS

Glass fiber-reinforced polymer (GFRP) bars are currently used to reinforce concrete members when durability is the main concern. Indeed, when exposed to aggressive conditions, traditional steel bars rapidly corrode affecting the performance of the reinforced concrete member. GFRP bars are available with various surface treatments, each providing a peculiar GFRP-concrete bond behavior. The GFRP-concrete bond behavior is usually investigated using the pull-out test. In this paper, results of GFRP-concrete pull-out tests are used to calibrate the GFRP-concrete interfacial cohesive material law (CML) that describes the relationship between the bar-concrete interface shear stress and the corresponding slip.