预应力碳纤维布加固混凝土梁非线性有限元分析

Nonlinear finite element analysis of concrete beams strengthened with prestressed CFRP sheets

采用ANSYS软件,对卸载或不卸载时预应力碳纤维布加固梁进行非线性有限元分析,并在有限元分析中提出了施加预应力的方法(升温法),以及利用单元的生与死实现不卸载时加固的方法.分析了预应力碳纤维布加固梁中受拉底面混凝土和碳纤维布节点的应力分布规律、以及钢筋与碳纤维布的荷载-应力关系.通过实例对比分析表明,基于ANSYS的有限元分析结果与试验分析结果吻合较好.图8,表2,参10.

Nonlinear finite element analysis by ANSYS software are done for the beams strengthened with prestressed carbon fiber reinforced polymer sheets (CFRP sheets) when they are uninstalled or when they are not uninstalled.In finite element analysis,the methods of bringing prestress to bear on CFRP sheets (the method of the rise in temperature) and strengthening when it is not uninstalled by birth and death of elements have been put forward.Stress distribution laws of concrete nodes of beam tension face and CFRP nodes and load-stress of reinforcing bar and CFRP sheets are analyzed for beams strengthened with prestressed CFRP sheets.It's shown that the result of finite element analysis by ANSYS has a close agreement with the experimental result.8figs.,2tabs.,10refs.