基于不确定性的氯离子侵蚀环境下普通混凝土结构的耐久性研究

Stochastic durability research on concrete structure under chloride ions erosion environment

针对氯盐侵蚀环境下普通混凝土结构的锈胀开裂,通过分析普通混凝土结构的腐蚀损伤发展特点,建立氯离子侵蚀环境下普通混凝土结构的耐久性失效准则。基于工程实例,采用不确定性分析方法,通过Monte Carlo随机模拟,对氯离子侵蚀环境下普通混凝土结构的锈胀开裂时间开展了可靠性分析研究,得出了其近似概率密度分布,通过假设检验,确定其服从对数正态分布,并给出其在不同保证率情况下锈胀开裂时间的取值。

Aims at concrete cracks due to reinforcement corrosion of concrete structure under chloride ions erosion environment, by analyzing the development characteristics of corrosion damage of reinforced concrete structure, the durability failure criterion of concrete structure is estab- lished.Based on real project, the uncertainty analysis method is used and through Monte Carlo stochastic simulation,the reliability analysis of con- crete crack time due to reinforcement corrosion of concrete structure under chloride ions erosion environment is carried out.The approximate prob- ability density distribution of concrete crack time due to reinforcement corrosion is gained, and through hypothesis testing, it is determined that the concrete crack time obey lognormal distribution.The values of the concrete crack time due to reinforcement corrosion under different guaranteed rate were given.