Effect of steel pit on the mechanical property was discussed in succession . numerical results show that exponential relation exists between the yield strength and depth of corrosion pit . the work in this part is the theoretical foundation on the study in modeling of constitutive behavior of the corroded concrete and rusty rebar 基于微观腐蚀机理分析了硫酸盐介质对混凝土的膨胀性腐蚀作用，从理论上研究了由于膨胀作用引起混凝土内部产生的膨胀应力；讨论了钢筋表面锈蚀坑对钢筋力学性能的影响，建立了钢筋屈服强度与蚀坑深度之间的关系；为受腐蚀混凝土和锈蚀钢筋本构关系的建立提供了一定的理论基础。
