<p>Reinforcement corrosion can occur in all types of steel reinforcement- tension, compression, and shear- in reinforced concrete (RC) beams. However, most existing analytical models for the load–deflection behavior of corroded slender RC beams have primarily focused on the effects of tension reinforcement corrosion. This study proposes a simplified analytical approach to predict the load–deflection response of flexure-dominated RC beams subjected to various reinforcement corrosion scenarios. The proposed analytical framework employs nonlinear analysis of the moment–curvature relationship at the critical section of the beams, with deflection equations derived for both four-point loading and uniformly distributed loading. The model considers the combined effects of reinforcement corrosion, including degradation of constitutive material properties, reduction in bond strength at the steel–concrete interface, and loss of cross-sectional area in the concrete beams. Model reliability was validated against experimental data from the previous study, showing reasonable agreement in load–deflection curves, load-carrying capacity, and midspan deflections at both yield and ultimate stages. Prediction errors ranged from − 11.0% to 12.1% for yield strength and − 5.4% to 12.8% for ultimate strength. Furthermore, a parametric study was also conducted to elucidate the behavior of corroded RC beams under different corrosion scenarios. The outcomes of this study are expected to provide a simplified and practical approach for the structural assessment of existing RC beams subjected to different reinforcement corrosion schemes.</p>