Effect of the interaction of corrosion pits among multiple tensile rebars on the reliability of RC structures: Experimental and numerical investigation
Effect of the interaction of corrosion pits among multiple tensile rebars on the reliability of RC structures: Experimental and numerical investigation
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DOI：
10.1016/j.strusafe.2021.102115
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发表时间：
2021-11
影响因子：
5.8
通讯作者：
S. Srivaranun;M. Akiyama;P. Bocchini;Vasileios Christou;D. Frangopol;H. Fukushima;K. Masuda
中科院分区：
文献类型：
--
作者：
S. Srivaranun;M. Akiyama;P. Bocchini;Vasileios Christou;D. Frangopol;H. Fukushima;K. Masuda
由于材料特性和环境应力的空间变异性，氯离子腐蚀引起的钢筋混凝土(RC)结构劣化在空间上是不均匀的。这种变化对钢筋混凝土结构的可靠性有很大的影响。然而，很少有试验研究关注钢筋间腐蚀坑的相互作用对钢筋混凝土结构可靠度的影响。因此，本文结合X射线和数字图像处理技术，对加速腐蚀钢筋混凝土板试件进行了试验研究。利用试验结果，估计了钢筋重量损失分布的横向相关函数参数，以研究锈蚀钢筋的腐蚀坑是如何关联的。基于实验获得的模型参数，用谱表示法模拟了钢材的空间失重分布。为获得钢筋混凝土结构的极限抗弯承载力，对钢筋混凝土结构进行了模拟钢筋重量损失分布的三维非线性有限元分析。通过算例，量化了多根受拉钢筋的钢筋重量损失分布之间的横向相关性对钢筋混凝土梁失效概率的影响。
The deterioration of reinforced concrete (RC) structures due to chloride-induced corrosion is not spatially uniform because of the spatial variability related to material properties and environmental stressors. This variation has a substantial effect on the reliability of RC structures. However, few experimental studies have focused on the effect of the interaction of corrosion pits among tensile rebars on the reliability of RC structures. Therefore, in this paper, an experimental procedure that incorporates X-ray and digital image processing techniques was conducted on RC slab specimens subjected to accelerated corrosion. Using the experimental results, the parameter of the transverse correlation function of steel weight loss distributions was estimated to investigate how the corrosion pits in corroded rebars are correlated. Based on the experimentally obtained model parameters, the spatial steel weight loss distributions were simulated by spectral representation method. A three-dimensional (3D) nonlinear finite element (FE) analysis of RC structures with simulated steel weight loss distributions was conducted to obtain the ultimate bending capacity of RC structures. In an illustrative example, the effect of the transverse correlation among steel weight loss distributions of multiple tensile rebars on the failure probability of RC girders was quantified.