混凝土桥梁构件中钢筋截面积的历时变化模型

Time-dependent Model for Steel Cross Section Area in Concrete Bridge Components

钢筋锈蚀导致的钢筋截面积损失是混凝土桥梁服役期抗力退化的重要因素。建立并分析了钢筋锈蚀开始时间的概率模型 ,利用回归拟合方法提出了钢筋截面积的平均值和标准差随时间变化的数学模型 ,为进一步研究混凝土桥梁服役期的抗力退化规律奠定了基础。

The steel section loss by rust is one of the main causes of reduction of the resistance of concrete bridge members. The authors establish a probabilistic model for the corrosion initiation. And the time- dependent mathematical models for mean value and standard deviation of sectional area of a corroding rebar are solved using regression theory. The results can be used to study the reduction of the resistance of concrete bridge members.