Analysis of factors affecting structural durability based on reinforced concrete corrosion-induced cracking

In harsh environments, the steel bars in reinforced concrete tend to corrode, reducing structural durability and functionality. Therefore, investigating the factors influencing concrete damage and cracking due to steel bar corrosion is crucial for analyzing structural durability. This study employs a phase field method (PFM) to model single steel bar corrosion, examining how corrosion morphology, cover thickness, concrete strength, heterogeneity, steel bar diameter, and aggregate content affect durability and failure patterns. The findings indicate that corrosion morphology and concrete heterogeneity significantly impact durability and failure, with increased non-uniform corrosion and heterogeneity leading to greater susceptibility to damage and cracking. While the impact of concrete strength is minor, the risk of cover failure rises as strength decreases. The influence of cover thickness and steel bar diameter on structural durability is small, with no significant effect on cover failure patterns. Although the random distribution of aggregates greatly affects durability and cover failure patterns, there is no significant correlation with aggregate content. This research provides essential references for the engineering design and durability analysis of concrete structures. © 2025 Institution of Structural Engineers