混凝土构件中钢筋非均匀锈胀应力研究

研究钢筋锈蚀引起混凝土保护层开裂的机理，对于评估受锈蚀影响的混凝土结构剩余寿命具有重要意义。本文提出了一种求解钢筋非均匀锈蚀应力场的解析方法。基于Muskhelishvili的复变函数法和Verruijt共形映射公式，利用基于冯·米塞斯分布的钢筋非均匀锈蚀模型作为位移边界条件，得到了钢筋非均匀锈胀应力的解析解。通过与基于ANSYS有限元模拟结果的比较，验证了解析解的有效性。对比了不同锈蚀模式下引起的应力，发现非均匀锈蚀引起的最大应力远大于均匀锈蚀引起的最大应力。通过实例探讨了影响钢筋锈胀力的各个因素，研究表明：钢筋直径越大，锈胀力越小，混凝土保护层越容易开裂；混凝土保护层厚度越大，锈胀力越大；混凝土强度等级越高，钢筋锈胀力亦越大。为易受锈蚀影响的钢筋混凝土构件设计提供了科学依据。

Research on Non-uniform Corrosion Expansion Stress of Reinforcing Bars in Concrete Members

The study of the mechanism of the cracking of the concrete protective layer caused by the corrosion of steel bars is of great significance for evaluating the remaining life of the concrete structure affected by the corrosion. This paper presents an analytical method for solving the stress field of non-uniform corrosion of steel bars. Based on Muskhelishvili's complex variable function method and Verruijt conformal mapping formula, using the von Mises distribution-based reinforcement non-uniform corrosion model as the displacement boundary condition, the analytical solution of the non-uniform corrosion expansion stress of the reinforcement is obtained. By comparing with the simulation results based on ANSYS finite element, the validity of the analytical solution is verified. Comparing the stress caused by different rust modes, it is found that the maximum stress caused by non-uniform rust is much larger than the maximum stress caused by uniform rust. Through examples, various factors affecting the corrosion expansion force of steel bars are discussed. The research shows that the larger the diameter of the steel bar, the smaller the corrosion expansion force, and the easier the concrete protective layer is to crack; the greater the thickness of the concrete protective layer, the greater the corrosion expansion force; The higher the rust expansion force of the steel bar is, the greater. It provides a scientific basis for the design of reinforced concrete components that are susceptible to corrosion.