This study aims to numerically investigate the behaviour of corroded circular reinforced concrete (RC) columns strengthened by carbon-fabric-reinforced cementitious matrix (C-FRCM) composites. Three-dimensional finite element (FE) models of the corroded circular RC columns with and without strengthening were set up and validated against previous experimental results. Based on the validated FE models, the parametric studies were carried out to investigate the effects of axial compression ratio, degree of corrosion and layer of carbon fabrics on the behaviour of corroded RC columns under cyclic loading. It shows that the lateral load resistance increased when the axial compression ratio ranged from 0.3 to 0.4, but decreased when the axial compression ratio ranged from 0.4 to 0.6; also the ductility of the corroded RC columns reduced with increasing axial compression ratio. The ultimate capacity of corroded RC columns decreased gradually with the increasing degree of corrosion. Based on the results of parametric studies, equations were developed to estimate the ultimate capacity and displacement of the corroded RC columns repaired by the C-FRCM. The proposed equations can well estimate the ultimate lateral load resisting capacity and ultimate displacement of the corroded circular RC columns strengthened by C-FRCM.

中文翻译：

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C-FRCM加固锈蚀圆形RC柱数值研究及抗震设计

本研究旨在数值研究碳纤维增强水泥基 (C-FRCM) 复合材料加固的腐蚀圆形钢筋混凝土 (RC) 柱的行为。建立了腐蚀圆形钢筋混凝土柱的三维有限元 (FE) 模型，并根据之前的实验结果进行了验证。基于经过验证的有限元模型，进行了参数化研究，以研究轴压比、腐蚀程度和碳织物层数对腐蚀钢筋混凝土柱在循环载荷下的行为的影响。可以看出，轴压比在0.3~0.4时侧向载荷阻力增大，轴压比在0.4~0.6时侧向载荷阻力减小；腐蚀的 RC 柱的延展性也随着轴压比的增加而降低。随着腐蚀程度的增加，腐蚀的 RC 柱的极限容量逐渐减小。基于参数研究的结果，开发了方程来估计 C-FRCM 修复的腐蚀 RC 柱的极限承载力和位移。所提出的方程可以很好地估计C-FRCM加固的腐蚀圆形RC柱的极限侧向承载能力和极限位移。