中文摘要：

本文将理论分析与实验结果相结合，提出受锈蚀影响的混凝土结构适用性和安全性的评估方法；引入弥散裂缝的概念并考虑混凝土的软化特性，建立混凝土保护层断裂分析模型；通过求解相应的微分方程，导出混凝土保护层表面裂缝宽度的解析解；基于实验结果，给出混凝土结构刚度和强度演化的经验公式，并讨论混凝土结构刚度和强度极限值的确定；应用概率理论，提出混凝土结构裂缝宽度、刚度和强度评估的可靠度方法；最后，给出一些数值结果并讨论影响预测结果的一些因素。

英文摘要：

With combination of theoreatical analysis with experimental results, an assessment method of seviceability and safety of rusted concrete structures is presented in this paper. By introducing the concept of smeared crack and considering the softness characteristics of concrete, a model of fracture analysis is established for concrete covers. Solving the corresponding differential equation, an analytical solution for the surface crack width of concrete covers is derived. Based on the experimental results, the empirical formulae of stiffness and strength evolution of concrete structures are given and the determination of the limit values of stiffness and strength of concrete structures is discussed. Applying the theory of probability, a reliability method is proposed for the assessment of crack width, stiffness and strength of concrete structures. Finally, some numerical results are given and some factors that affact the predicted results are discussed.