碳纤维布加固钢筋混凝土吊车梁的疲劳损伤机理及损伤累积性能研究  

Study on Fatigue Damage Mechanism and Cumulative Damage of the Damaged Crane Beam Strengthened with CFRP

作　　者：石启印[1] 贺龙芳[1] 李爱群[2] 惠卓[2] 

机构地区：[1]江苏大学土木工程系,江苏镇江212013 [2]东南大学教育部重点实验室,南京210096

出　　处：《建筑科学》2008年第11期6-9,共4页Building Science

基　　金：江苏省自然科学基金资助项目(BK2004064)

摘　　要：以碳纤维布(CFRP)加固损伤钢筋混凝土吊车梁的抗弯疲劳试验研究为基础,分析了加固吊车梁中钢筋疲劳破坏产生的原因,揭示了CFRP加固钢筋混凝土吊车梁的疲劳破坏机理。建立了碳纤维布加固钢筋混凝土吊车梁的疲劳累积损伤模型,并根据所建立的吊车梁的疲劳累积损伤模型,对本文试件进行了疲劳损伤程度分析。研究表明,采用CFRP加固钢筋混凝土吊车梁的剩余抗弯刚度来度量其疲劳损伤变量,具有明确的物理意义。在此基础上,建立的疲劳损伤演化方程能够准确模拟CFRP加固钢筋混凝土吊车梁的疲劳损伤破坏过程。Based on the experimental results of the Damaged Crane beam Strengthened with CFRP, the failure reason of the fatigue of reinforcement is given. The fatigue failure mechanism of the strengthened crane beam is studied. The cumulative fatigue damage model is proposed to describe the fatigue damage level of the strengthened crane beam. The results indicate that the damage is defined by using the residual bending rigidity of the strengthened beam with obvious physical meaning and the cumulative fatigue damage model describing the damage and failure process of the crane beam is in good agreement with fatigue experiments.

关 键 词：CFRP(碳纤维布) 钢筋混凝土吊车梁 疲劳损伤 损伤累积 疲劳累积损伤模型 

分 类 号：TU375.1[建筑科学—结构工程]