This paper discusses performance of the reinforced concrete structures deteriorated by corrosion on basis of numerical simulation analysis. The purpose is to preliminarily investigate the idea of performance comparison of circular and square reinforced concrete columns under corroded conditions. Previous research carried out by the authors shows that equivalent area reinforced concrete (RC) columns exhibit similar load-displacement behavior under flexural and shear controlled conditions. The two types of columns deviate from this similarity after the corrosion of steel reinforcement present in the concrete. The change in the load-displacement behavior is highly dependent upon factors including the corrosion ratio, axial load, presence of web reinforcement etc., The experimentally verified 3D finite element modelling (FEM) program (COM3D) was used to investigate the seismic performance of the circular shaped and its equivalent area square shaped RC columns. The results show that the effect of mild corrosion (around 2% corrosion) on the load-displacement behavior of square RC columns is more significant as compared to circular RC columns at without axial load and at lesser main reinforcement ratio while a similar behavior or reverse trend is observed at higher main reinforcement ratios and for cases with 10% axial load. The effect of corrosion on the web reinforcement present in square columns is more pronounced as compared to circular columns at low main reinforcement ratios.

本文在数值模拟分析的基础上，探讨了钢筋混凝土结构因腐蚀而劣化的性能。目的是初步研究圆形和方形钢筋混凝土柱在腐蚀条件下的性能比较的想法。作者先前进行的研究表明，在弯曲和剪切控制条件下，等面积钢筋混凝土（RC）柱表现出相似的荷载-位移特性。在混凝土中存在钢筋腐蚀之后，两种类型的柱子就偏离了这种相似性。载荷-位移行为的变化高度取决于各种因素，包括腐蚀率，轴向载荷，腹板增强材料的存在等。经过实验验证的3D有限元建模（FEM）程序（COM3D）用于研究圆形及其等效面积正方形RC柱的抗震性能。结果表明，与圆形RC柱相比，轻度腐蚀（约2％腐蚀）对方形RC柱在无轴向载荷和较小主筋比的情况下的荷载-位移行为的影响更为显着，而在相似行为或反向荷载下在较高的主配筋率和轴向载荷为10％的情况下观察到这种趋势。与低主增强比的圆形立柱相比，腐蚀对方形立柱中腹板增强件的影响更为明显。结果表明，与圆形RC柱相比，轻度腐蚀（约2％腐蚀）对方形RC柱在无轴向载荷和较小主筋比的情况下的荷载-位移行为的影响更为显着，而在相似行为或反向荷载下在较高的主配筋率和轴向载荷为10％的情况下观察到这种趋势。与低主增强比的圆形立柱相比，腐蚀对方形立柱中腹板增强件的影响更为明显。结果表明，与圆形RC柱相比，轻度腐蚀（约2％腐蚀）对方形RC柱在无轴向载荷和较小主筋比的情况下的荷载-位移行为的影响更为显着，而在相似行为或反向荷载下在较高的主配筋率和轴向载荷为10％的情况下观察到这种趋势。与低主增强比的圆形立柱相比，腐蚀对方形立柱中腹板增强件的影响更为明显。