Modeling Steel Concrete Bond Strength Reduction Due to Corrosion
Modeling Steel Concrete Bond Strength Reduction Due to Corrosion
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DOI：
10.14359/51688925
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发表时间：
2016-09-01
影响因子：
1.8
通讯作者：
Gilbert, Raymond Ian
中科院分区：
文献类型：
--
作者：
Castel, Arnaud;Khan, Inamullah;Gilbert, Raymond Ian
钢筋混凝土（RC）结构中的钢筋腐蚀引起混凝土开裂，并导致钢截面和钢-混凝土结合强度的降低。本文提出了一种新的模型，该模型基于基于钢的腐蚀截面损失的标量损伤参数Dc。模型预测是根据文献中基于加速和自然腐蚀过程的实验数据绘制的，并与其他现有的经验模型进行了比较。提出的新模型显著改善了腐蚀钢筋结合强度的预测，并且适用于直径在10至20 mm（0.39至0.79 in.）之间的所有范围。此外，考虑到自然（局部）腐蚀和马镫的存在，模型中还加入了两个附加参数。马镫约束系数st和凹坑穿透深度系数A已经成功地使用文献中的实验结果校准。
Reinforcement corrosion in reinforced concrete (RC) structures induces concrete cracking and leads to a reduction in both steel cross section and steel-concrete bond strength. In this paper, a new model is proposed based on a scalar damage parameter Dc that depends on the loss of cross-sectional area of steel due to corrosion. The model predictions are plotted against experimental data from the literature based on both accelerated and natural corrosion processes and compared to other existing empirical models. The proposed new model significantly improves the prediction of the bond strength of corroding steel bars and is valid for all diameters ranging between 10 and 20 mm (0.39 and 0.79 in.). Moreover, two additional parameters have been implemented in the model, allowing for the consideration of natural (localized) corrosion and the presence of stirrups. A stirrups confinement coefficient st and a pit penetration depth coefficient a have been successfully calibrated using experimental results from the literature.