A nonlinear prediction model of the debonding process of an FRP-concrete interface under fatigue loading

•The fatigue debonding rate was determined by the amplitude and level of the load.•The proposed model explicitly took into account the noted factors.•The da/dN and the S¯·ΔS show a linear relationship in double logarithmic coordinates.•The debonded FRP has a significant effect on the subsequent debonding development.