Corrosion reduces the area of reinforcement steel, affects its mechanical properties, the bond properties, and produces concrete cracking. Thus, reduction of the bearing capacity and stiffness, increments of deflections and redistribution of stresses and internal forces, in statically indeterminate structures, take place. In addition, the efficiency of strengthening systems of corroded structures depends on their state of stresses, strains and damage previously to strengthening. In this paper, a nonlinear and time dependent step by step analysis model for reinforced and prestressed concrete frames is presented. The model is capable of capturing the structural effects of corrosion and the effects of strengthening interventions, necessary to adequately assess corroded and strengthened structures. Several cases of corroded and strengthened structures are analyzed and the results discussed.

中文翻译：

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模拟腐蚀钢筋和预应力混凝土结构的使用性能和极限承载力

腐蚀会减少钢筋的面积，影响其力学性能、粘结性能，并产生混凝土开裂。因此，在静力不确定的结构中，承载能力和刚度的降低、挠度的增加以及应力和内力的重新分布都会发生。此外，腐蚀结构的加固系统的效率取决于它们在加固之前的应力、应变和损坏状态。在本文中，提出了一种用于钢筋和预应力混凝土框架的非线性和时间相关的逐步分析模型。该模型能够捕捉腐蚀的结构影响和加强干预的影响，这是充分评估腐蚀和加强结构所必需的。