作　　者： ; ;

机构地区： 华南理工大学土木与交通学院

出　　处： 《沈阳建筑大学学报（自然科学版）》 2010年第3期428-432,共5页

摘　　要： 目的建立疲劳寿命预测模型,为加固构件的抗疲劳设计提供新的方法.方法提出了一种可以同时考虑钢筋、混凝土和碳纤维耦合作用下的动态损伤模型.定义加固梁的剩余抗弯刚度为损伤变量,在正截面应力分析的基础上,运用分段线性原理,分析了碳纤维薄板加固梁在疲劳载荷下刚度衰减规律.结果利用动态损伤模型,数值模拟了碳纤维薄板加固钢筋混凝土梁受弯构件疲劳损伤全过程,计算了加固梁的疲劳寿命.结论由于考虑了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,动态损伤模型能够较好地预测CFL增强RC梁的疲劳寿命. The aim of this study is to establish the fatigue life prediction model and provide a new method for fatigue design of reinforced members.The dynamic damage model is given coupling reinforced,concrete and carbon fiber.Residual stiffness of strengthened beam is defined as the damage variable.Based on the stress a-nalysis of cross-section and piecewise linear theory,stiffness attenuation is analyzed.Use of damage model,the whole process of fatigue damage of the carbon fiber laminate reinforced concrete beams can be simu-lated,and fatigue life of reinforced beams is calculated.Taking account of the material damage as a result of different mechanisms of fatigue damage during stress redistribution phenomenon,dynamic damage model can predict the fatigue life of RC beams with CFL.

关 键 词： 疲劳寿命 循环载荷 碳纤维薄板 梁 刚度

领　　域： [建筑科学]