锈蚀钢筋坑蚀因子概率分布模型研究

Study on probability distribution model of pitting corrosion factor of corroded rebar

钢筋锈蚀后的形貌对于分析锈蚀钢筋力学性能退化规律及评定结构的安全性、预测其使用年限具有重要意义。锈坑作为锈蚀钢筋应力集中、延性降低的重要影响因素,其坑蚀因子概率分布是结构耐久性研究不可缺少的内容。对混凝土试块中50根通电加速锈蚀钢筋坑蚀因子的概率分布进行分析,探究不同锈蚀率、不同钢筋长度对钢筋坑蚀因子概率分布模型的影响。结果表明:混凝土中通电会引起锈蚀钢筋坑蚀因子概率分布模型服从对数正态分布,锈蚀率与钢筋长度不影响其概率分布类型,只影响坑蚀因子数值的均值和标准偏差。

The morphology of the corroded steel bar is of great significance to the analysis of the deterioration law of the mechanical properties of corroded rebar and the safety of the structure and the expected service life. As an important factor affecting the stress concentration and ductility reduction of corroded steel bars, the probability distribution of pitting corrosion factors is an indispensable element in the study of structural durabil- ity. In this paper, the probability distribution of 50 electric power accelerated corroded corrosion factors in concrete specimen is analyzed, and the influence of different corrosion rate and length of steel bar on the prob- ability distribution model of the pitting corrosion factor is explored. The results show that the probability distri- bution model of pitting corrosion factor of corroded rebar will be caused by electric power in concrete, and the probability distribution type of corrosion rate and steel bar length are not affected, only the mean and standard deviation of pitting factor value are affected.