Steel reinforcement corrosion is becoming a critical issue due to the amount of old buildings still in operation with a high probability of substantial corrosion in their reinforcements. The strength and serviceability of corroded reinforced concrete (RC) slab is remarkably impacted by corrosion. Therefore, it is vital to understand more about the punching shear mechanism of slabs subjected to corrosion effects in order to make a good prediction regarding residual capacity. In this paper, critical shear crack theory (CSCT) was further developed to predict the residual punching shear strength of corroded RC slabs, considering the deterioration of material properties induced by corrosion. The effectiveness of modified CSCT was verified by comparison with the available experimental results. In addition, a validated finite element model that considers material deterioration and bond degradation was proposed to verify the accuracy of the proposed model. Finally, a parametric study of 240 cases was conducted to investigate the effect of some important factors on the punching shear behaviour of corroded RC slabs based on modified CSCT. The outcomes demonstrated that the residual punching shear capacity predicted by the proposed model is more accurate than existing design codes. The predicted failure modes also showed fairly good agreement with the experimental results.

中文翻译：

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锈蚀钢筋混凝土板的残余冲剪承载力

钢筋腐蚀正成为一个关键问题，因为许多仍在运行的旧建筑物的钢筋很可能发生严重腐蚀。腐蚀的钢筋混凝土 (RC) 板的强度和使用性能受到腐蚀的显着影响。因此，了解更多关于受腐蚀影响的板坯的冲切机制对于更好地预测剩余容量至关重要。在本文中，考虑到腐蚀引起的材料性能退化，进一步发展了临界剪切裂纹理论 (CSCT) 来预测腐蚀 RC 板的残余冲剪强度。通过与现有实验结果的比较，验证了改进的 CSCT 的有效性。此外，提出了一个考虑材料退化和键退化的经过验证的有限元模型来验证所提出模型的准确性。最后，基于改进的 CSCT，对 240 个案例进行了参数化研究，以研究一些重要因素对锈蚀 RC 板冲剪行为的影响。结果表明，所提出模型预测的剩余冲剪承载力比现有设计规范更准确。预测的失效模式也与实验结果非常吻合。结果表明，所提出模型预测的剩余冲剪承载力比现有设计规范更准确。预测的失效模式也与实验结果非常吻合。结果表明，所提出模型预测的剩余冲剪承载力比现有设计规范更准确。预测的失效模式也与实验结果非常吻合。