Effects of galvanostatic and artificial chloride environment methods on the steel corrosion spatial variability and probabilistic flexural capacity of RC beams
Effects of galvanostatic and artificial chloride environment methods on the steel corrosion spatial variability and probabilistic flexural capacity of RC beams
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DOI：
10.1080/15732479.2022.2061016
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发表时间：
2022-11
影响因子：
3.7
通讯作者：
Jiyu Xin;M. Akiyama;S. Miyazato;D. Frangopol;Sopokhem Lim;Zhejun Xu;Ao Li
中科院分区：
文献类型：
--
作者：
Jiyu Xin;M. Akiyama;S. Miyazato;D. Frangopol;Sopokhem Lim;Zhejun Xu;Ao Li
摘要恒电流法已被广泛用于加速混凝土中钢筋的腐蚀，以在合理的时间内完成试验研究。然而，这一水平的电流密度诱导钢筋腐蚀的空间变异性和相关的结构性能的腐蚀钢筋混凝土（RC）梁，类似于在自然条件下观察到的特征仍然未知。本文通过两种腐蚀加速方法（6种电流密度下的恒电流法和人工氯离子环境法）对锈蚀钢筋混凝土梁的钢筋重量损失和裂缝宽度的空间扩展特性以及结构性能进行了综合试验研究。这些腐蚀加速方法对Gumbel的位置和规模分布参数和相关的屈服荷载能力的腐蚀钢筋混凝土梁的影响进行了研究，使用基于Monte Carlo的二维有限元分析。最后，建议一个合适的电流密度，以更好地模拟钢筋锈蚀分布和相关的屈服荷载能力的钢筋混凝土梁相比，在人工氯化物环境下观察到的。
Abstract The galvanostatic method has been widely used for accelerating the corrosion of reinforcing bars in concrete to complete test studies within a reasonable timeframe. However, which level of current density induces characteristics of steel corrosion spatial variability and the associated structural performance of corroded reinforced concrete (RC) beams that are similar to those observed under natural conditions remains unknown. In this paper, comprehensive experimental research is conducted to compare the characteristics of spatial growth in steel weight loss and crack width and the structural behavior of corroded RC beams by two corrosion-accelerated methods (i.e. galvanostatic method at six current densities and artificial chloride environment method). The effects of these corrosion acceleration methods on Gumbel’s location and scale distribution parameters and the associated yield load capacity of corroded RC beams are investigated using Monte Carlo-based two-dimensional finite element analysis. Finally, a suitable current density is recommended to better simulate the steel corrosion distribution and the associated yield load capacity of RC beams in comparison to those observed under an artificial chloride environment.