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在钢筋混凝土结构自身材料、荷载和气候环境的作用下,钢筋混凝土结构或构件会随着使用时间的增加而逐渐老化,出现耐久性问题。对耐久性降低的程度和承载力的衰减程度进行定量分析,是结构耐久性研究中的关键问题。在既有研究成果的基础上,建立锈蚀钢筋的锈蚀量预测模型,从钢筋的力学参数出发,建立锈蚀钢筋的力学性能衰减模型。采用数值方法,分析了3种不同锈蚀类型在不用锈蚀参数作用下钢筋锈蚀的一般规律。研究成果为进一步研究钢筋混凝土结构耐久性能裂化和承载力时变衰减奠定了基础。
In the reinforced concrete structure of its own material, load and climate and environment, reinforced concrete structures or components will gradually increase with the use of time and aging, the emergence of durability problems. Quantitative analysis of the degree of durability reduction and the degree of attenuation of the bearing capacity is a key issue in the study of structural durability. Based on the existing research results, a prediction model of corroded reinforcement corrosion is established. Based on the mechanical parameters of rebar, a model of mechanical properties degradation of corroded reinforcement is established. Numerical methods were used to analyze the general rules of steel corrosion under three kinds of corrosion types without rust parameters. The research results lay the foundation for further research on the durability cracking resistance of reinforced concrete structures and the time-varying attenuation of bearing capacity.