常幅循环载荷下纤维薄板增强钢筋砼梁的损伤行为研究  

FATIGUE DAMAGE EVOLVEMENT OF REINFORCED CONCRETE BEAM STRENGTHENED WITH FIBER LAMINATE UNDER CONSTANT AMPLITUDE LOAD

作　　者：姚国文[1] 黄培彦[1] 牛鹏志[1] 赵琛[1] 郑小红[1] 

机构地区：[1]华南理工大学交通学院,广州510640

出　　处：《机械强度》2004年第z1期25-27,共3页Journal of Mechanical Strength

基　　金：国家自然科学基金 (1 0 2 72 0 4 7);广东省自然科学基金 (0 2 0 856);华南理工大学自然科学基金资助项目~~

摘　　要：以碳纤维薄板增强钢筋混凝土梁为研究对象 ,通过对常幅循环载荷作用下增强梁的弯曲试验研究 ,揭示其疲劳破坏机理 ,建立描述构件损伤、断裂过程的结构损伤累积模型。试验得到增强梁的疲劳寿命曲线以及跨中挠度、抗弯刚度的演化规律。提出的由构件抗弯刚度表达的非线性结构疲劳损伤演化方程 ,描述包括混凝土开裂、碳纤维薄板与混凝土界面剥离等破坏模式在内的损伤、破坏过程 。The fatigue properties of reinforced concrete (RC) beam strengthened with Carbon fiber laminate (CFL) under constant amplitude load were probed by three bending experiments. The fatigue failure mechanism of strengthened RC beam was studied and the structural damage cumulative model was proposed to describe the damage and fracture process of strengthened beam. The fatigue lives, histories of midspan flexibility and bending rigidity of RC beams strengthened with CFL were recorded in experiments. Then the evolvement equation of nonlinear structural fatigue damage expressed by member's bending rigidity was proposed. The structural fatigue damage model describes the damage and failure process of strengthened RC beam well, including concrete cracking, CFL debonding from concrete, and can predict the fatigue lives of strengthened RC beams.

关 键 词：常幅循环载荷 碳纤维薄板 钢筋混凝土梁 结构疲劳损伤 抗弯刚度 

分 类 号：O346.2[理学—固体力学] TB321[理学—力学]