Numerical modeling of repaired reinforced concrete bridge columns

•An innovative three-phase fiber-based modeling strategy for the analysis of repaired reinforced concrete columns is developed.•Four time-dependent material models are introduced that allow making through-analysis changes to fiber sections to simulate repair modifications.•A versatile bar-slip model is developed to accurately capture longitudinal bar slip and strain penetration in the foundation.•A mechanical bar-buckling model is developed that accounts for axial-flexural interactions and may be used to model bars of different materials.•The developed modeling strategy and bar-slip and bar-buckling models are evaluated by comparing their predictions with previous test data.