碳纤维加固部分预应力梁抗弯疲劳损伤非线性分析方法

摘要

提出了一种考虑钢筋、混凝土和碳纤维布3种材料耦合作用的疲劳损伤非线性分析方法.该方法可以考虑由于组成材料损伤机制不同而造成的疲劳损伤过程中的应力重分布现象,并且适用于变幅重复应力作用的情况.通过分段线性的方法实现了混凝土梁的非线性损伤过程分析.最后将计算结果同试验结果进行了对比.%An analysis method about the process of non-linear fatigue damage is put forward, considering the coupling action of three materials: reinforcment, concrete and carbon fiber sheet. This method takes account of the stress redistribution in the fatigue damage process caused by the difference between damage mechanisms of concrete, reinforcement and CFRP, and is applicable to variable-amplitude repeated loadings. The nonlinear damage process is achieved by means of piecewise linearity. Finally, the outcomes of calculation and experiment are compared.