Abstract: In recent years, the number of bridge projects in my country's transportation system has increased year by year. After bridges have been put into use, the regional transportation network tends to be improved, which provides convenience for traffic. However, bridges of various structures and grades often suffer from structural instability and insufficient durability, which not only cause serious traffic accidents, but also affect the economic and social benefits of the bridge. Therefore, the research on the durability of bridge structures becomes very critical.