Chloride-induced corrosion of reinforced concrete (RC) is one of the main reasons for decreasing the seismic performance level of RC structures over their lifetime. In the present study, base shear capacity and ductility were considered as criteria for evaluating seismic performance of the RC frame. The impact of corrosion on the ductility and base shear capacity of a two-dimensional single-story single-span RC frame was investigated using nonlinear static analysis considering the deterioration of the mechanical properties of the rebar and concrete. The corrosion damage model was implemented using fiber sections and nonlinear elements, and then pushover analysis over 0, 15, 30, 45, and 60 years of life was performed. The strain penetration effect was considered in the fiber model at the column-footing joints. The accuracy of modeling was validated with experimental data of the RC frame subject to cycle loading. The final results showed that by decreasing the water-to-cement ratio and increasing the cover thickness, the seismic performance of the RC frame is preserved over a lifetime. The time-dependent ductility of the RC frame was evaluated at two structural and cross-sectional levels. The results revealed that the corroded RC frame has a lower base shear capacity, ultimate drift, and ductility than the intact RC frame. Also, the corrosion-induced deterioration of rebar and concrete significantly decreases the seismic performance of the corroded RC frame.

中文翻译：

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钢筋混凝土框架构件腐蚀对框架推覆行为和延性的影响

钢筋混凝土 (RC) 的氯化物引起的腐蚀是降低 RC 结构在其使用寿命期间抗震性能水平的主要原因之一。在本研究中，基础抗剪承载力和延性被认为是评估 RC 框架抗震性能的标准。考虑到钢筋和混凝土的力学性能劣化，采用非线性静力分析研究腐蚀对二维单层单跨钢筋混凝土框架的延性和基础抗剪承载力的影响。腐蚀损伤模型是使用纤维截面和非线性元素实现的，然后进行了 0、15、30、45 和 60 年寿命的 Pushover 分析。在纤维模型中，柱基节点处考虑了应变穿透效应。模型的准确性通过受循环加载的 RC 框架的实验数据验证。最终结果表明，通过降低水灰比和增加覆盖层厚度，RC 框架的抗震性能在整个生命周期内得以保持。在两个结构和横截面水平上评估了 RC 框架的时间相关延展性。结果表明，腐蚀后的 RC 框架比完整的 RC 框架具有更低的基础抗剪承载力、极限漂移和延展性。此外，钢筋和混凝土的腐蚀引起的劣化显着降低了腐蚀钢筋混凝土框架的抗震性能。RC 框架的抗震性能在整个生命周期内保持不变。在两个结构和横截面水平上评估了 RC 框架的时间相关延展性。结果表明，腐蚀后的 RC 框架比完整的 RC 框架具有更低的基础抗剪承载力、极限漂移和延展性。此外，钢筋和混凝土的腐蚀引起的劣化显着降低了腐蚀钢筋混凝土框架的抗震性能。RC 框架的抗震性能在整个生命周期内保持不变。在两个结构和横截面水平上评估了 RC 框架的时间相关延展性。结果表明，腐蚀后的 RC 框架比完整的 RC 框架具有更低的基础抗剪承载力、极限漂移和延展性。此外，钢筋和混凝土的腐蚀引起的劣化显着降低了腐蚀钢筋混凝土框架的抗震性能。