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基于混凝土锈胀开裂过程的随机性,提出了一种预测钢筋锈蚀程度、锈胀裂缝开展状况及承载力退化程度时变特性的路径概率模型,并编制了计算程序,能有效评估和预测氯离子侵蚀、混凝土碳化及两者耦合作用环境下钢筋锈蚀状况、锈胀裂缝宽度开展及构件承载力退化程度在不同时段的概率分布,实现了混凝土构件从有害物质侵蚀、钢筋锈蚀、混凝土开裂、钢筋锈蚀加剧、混凝土裂缝宽度增大到构件承载力下降的性能劣化全过程的数值模拟。可预测的性能特征参数包括钢筋样本锈蚀百分比,锈蚀率,混凝土开裂面积百分比,裂缝宽度及构件承载力退化百分比。预测结果与现场检测获得的统计结果吻合良好,验证了该模型的可靠性和有效性。
Based on the randomness of the process of concrete cracking process, a path probabilistic model was proposed to predict the corrosion degree of steel bars, the development of corrosion cracks and the time-varying characteristics of the degree of degradation of bearing capacity. A calculation program was developed to evaluate and predict chloride ion Corrosion of concrete, carbonation of concrete and the corrosion resistance of steel bar under the environment of the coupling of the two, the development of the width of rust expansion and the probability distribution of the degree of degradation of the bearing capacity of the component at different time periods have realized the corrosion of concrete components from harmful substances, steel corrosion, concrete cracking, Aggravate the concrete crack width increases to reduce the carrying capacity of components performance degradation of the whole process of numerical simulation. Predictable performance characteristics include corrosion percentage of steel samples, corrosion rate, percent cracking area of concrete, crack width, and percent degradation of component bearing capacity. The predicted results are in good agreement with the statistical results obtained from the field tests, which verify the reliability and effectiveness of the model.