摘要
应用混凝土断裂理论,通过断裂韧度与最大荷载的关系建立了考虑混凝土结构初始缺陷和微裂缝的临界锈张力预测模型;基于断裂韧度的尺寸效应,采用保护层厚度作为梁高对锈胀力预测模型进行了修正;结合弹性力学建立了包括钢筋截面损失、钢筋与混凝土界面间隙和钢筋间距影响的保护层锈胀开裂耐久寿命预测模型。对不同保护层厚度和锈蚀率的预测值与实验结果进行了比较,从而证实了预测模型的有效性。对锈胀开裂耐久寿命受因素变化的影响规律做了详细的分析。
A new prediction model for the critical expansion force relating to initial flaw and crack size is deduced in terms of the relationship between fracture toughness and maximal load based on the fracture mechanics theory of concrete. Moreover, a new method of predicting the time when the concrete cover cracks because of the expansion of corrosion products is presented by using elastic mechanics and documents reported. When the presented prediction model is compared with the actual experimental results, a good agreement is obtained, so the validity of the model can be verified. By analyzing the factors, an important conclusion that the critical expansion forces are strongly dependent on initial flaw and crack size is drawn.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2007年第8期54-57,共4页
Journal of Northeast Forestry University
基金
吉林省教育厅"十一五"规划项目(2006-084)。
关键词
钢筋混凝土
断裂韧度
尺寸效应
锈胀力
耐久寿命
Reinforced concrete
Fracture toughness
Size effect
Corrosion expansion force
Service life
