氯氧镁涂层钢筋混凝土两重因素耦合作用下的耐久性模型

Durability model of magnesium oxychloride-coated reinforced concrete under the two coupling factors

针对只考虑氯离子、硫酸根离子或碳化作用下混凝土寿命预测模型与实际服役条件不相符的问题,提出利用反映钢筋锈蚀的腐蚀电流密度和表征混凝土破坏的相对动弹性模量评价参数作为边缘分布函数参数,在Copula函数的基础上建立耦合因素作用下氯氧镁涂层钢筋混凝土(MOCRC)寿命预测模型。结果表明:Gumble-Copula函数可以很好地对两重耦合因素作用下的MOCRC耐久性进行预测,MOCRC在20000 d左右发生破坏。两重耦合因素作用下Copula函数寿命预测模型的建立,为多重因素耦合作用下的寿命预测模型提供了新的研究方向。

The concrete life prediction model does not accord with actual service conditions if only chloride ion,sulfate ion or carbonation are considered.To solve this problem,the corrosion current density,which reflects the steel corrosion,and the relative dynamic elastic modulus evaluation parameter,which characterizes the concrete damage,are taken as the marginal distribution function parameters.Then a life prediction model of Magnesium Oxychloride-Coated Reinforced Concrete(MOCRC)is established based on the Copula function.The results show that the Gumble-Copula function can predict the durability of MOCRC under the influence of two coupling factors,and the damage of MOCRC is about 20000 d.The establishment of the Copula function life prediction model under the influence of two coupling factors provides a new research direction for the life prediction model under the multiple coupling factors.