BOND BEHAVIOR TEST AND BOND-SLIP CONSTITUTIVE RELATION BETWEEN FRP REBAＲS AND CONCRETE

The pull-out test was conducted on 30 specimens of fiber reinforced polymer ( FRP) rebars embedded into concrete blocks． The effects of FRP types，diameters of FRP rebars，bond length and concrete strength on bond behavior were investigated． Based on the test results，the bond-slip constitutive model and bond strength of FRP rebar-to-concrete interface were established，whose results were compared with test results． The test results showed that the failure mode was fracture or sliding out of FRP rebars． The most important factor on interfacial bond strength was type of FRP rebar． The calculated results indicated that the proposed model had a good agreement with the test data，which could effectively predict the interfacial bond strength and the relationship of bond shear stress and interfacial slip．