预应力碳纤维布加固损伤混凝土梁有限元分析

采用ANSYS软件,对不卸载时预应力碳纤维布加固钢筋混凝土梁的受力变形性能进行了非线性有限元计算分析。计算中预应力采用升温法施加,初始损失利用单位生、死来实现。由对比可知:数值计算结果与试验结果吻合较好。通过对不同初始损伤量及碳纤维布加固量进行的扩展计算可知:初始损伤量对混凝土梁承载能力几乎无影响,增加碳纤维加固量能有效提高混凝土梁的承载能力。

Nonlinear Finite Element Analysis of Damaged Concrete Beams Strengthened with Prestressed CFRP Sheets

By ANSYS nonlinear finite element,the beams strengthened with prestressed CFRP sheets were analyzed when they were loaded.In finite element analysis,the method of rising the temperature of CFRP was used to prestress,and the initial loss was realized by birth and death of elements.The result of finite element analysis had a good agreement with the experimental result.Based on this,the influence of initial damage and the CFRP thickness on the load capacity of concrete beams was calculated.The results show that initial damage has no effect on the load capacity of beams.Adding the volume of CFRP can efficiently improve the load capacity of beams.