Reinforcement inside the concrete is protected from corrosion and its damages until several years after the construction. After corrosion initiation, the cross section of reinforcement begins to reduce and often load ...Reinforcement inside the concrete is protected from corrosion and its damages until several years after the construction. After corrosion initiation, the cross section of reinforcement begins to reduce and often load bearing of the reinforced concrete structure will be reduced significantly. Corrosion of reinforcements in concrete in polluted and contaminated areas can occur in two ways: chloride and carbonation. In this work, meta-heuristic approach of charged system search(CSS) is used to calculate corrosion occurrence probability due to chloride ions penetration. The model efficiency is verified by comparing the available examples in technical literature and results of Monte Carlo analysis. According to the analyses performed, using different probabilistic distributions regardless of probabilistic moments based on real distribution leads to diverse results. In addition, influence of each effective parameter in corrosion occurrence varies by changing other parameters.展开更多
文摘针对低压电流互感器表面裂纹的提取与判定,提出基于渗透算法和改进型OPTA(One-Pass Thinning Algorithm)的互感器表面裂纹检测算法。首先获取互感器表面的灰度图像;其次根据裂纹区域像素值、亮度变化,通过设定种子像素点、亮度阈值,利用渗透算法渗透得到二值图;再次从裂纹连通性入手,利用改进型OPTA提取ROI(Region of Interest)的骨架,骨架由单像素点组成;最后利用裂纹具有分叉性的特点,像素点的邻域点个数超过2的即可判定为裂纹。实验表明,渗透算法能够有效地从图像中提取出ROI,并保持了ROI的线性特征,改进型OPTA使ROI完全细化为单像素图像,提出的邻域点判别法检测效率在97%以上,相较于所提其他检测方法有明显提高。
文摘Reinforcement inside the concrete is protected from corrosion and its damages until several years after the construction. After corrosion initiation, the cross section of reinforcement begins to reduce and often load bearing of the reinforced concrete structure will be reduced significantly. Corrosion of reinforcements in concrete in polluted and contaminated areas can occur in two ways: chloride and carbonation. In this work, meta-heuristic approach of charged system search(CSS) is used to calculate corrosion occurrence probability due to chloride ions penetration. The model efficiency is verified by comparing the available examples in technical literature and results of Monte Carlo analysis. According to the analyses performed, using different probabilistic distributions regardless of probabilistic moments based on real distribution leads to diverse results. In addition, influence of each effective parameter in corrosion occurrence varies by changing other parameters.
