The corrosion of embedded steel bars in concrete is one of the severe deterioration processes that can escalate the risk and reduce the durability and lifetime of concrete structures. Based on the literature, simultaneous corrosion of longitudinal and transverse bar is considered to estimate section capacity. In this research, a flexible multi-stage approach is proposed to differentiate between corrosion levels on longitudinal and transverse reinforcement based on their corrosion initiating time. The result indicated that the multi-stage approach provides higher capacity and curvature for the sections. A significant reduction in reinforced concrete (RC) sections’ ductility after corrosion of confining bars and before starting corrosion of longitudinal rebars was observed, which illustrates the importance of stirrups corrosion effects on the sections’ ductility. In the higher values of corrosion intensity, confined concrete’s ultimate strain tends to reach the unconfined state. Using the energy-based method of calculating ultimate concrete compressive strain instead of approximate methods, a higher value of curvature ductility of corroded RC cross-sections is obtained.

混凝土中预埋钢筋的腐蚀是严重恶化的过程之一，会增加风险并降低混凝土结构的耐久性和使用寿命。根据文献，纵向和横向钢筋的同时腐蚀被认为是估计截面容量。在这项研究中，提出了一种灵活的多阶段方法，根据腐蚀开始时间区分纵向和横向钢筋的腐蚀程度。结果表明，多级方法为截面提供了更高的容量和曲率。观察到在约束钢筋腐蚀之后和纵向钢筋开始腐蚀之前，钢筋混凝土 (RC) 截面的延展性显着降低，这说明了箍筋腐蚀对截面延展性的重要性。在较高的腐蚀强度值下，约束混凝土的极限应变趋于达到无约束状态。使用基于能量的计算混凝土极限压应变的方法而不是近似方法，可以获得更高的腐蚀钢筋混凝土截面的曲率延性值。