华南理工大学学报(自然科学版) ›› 2007, Vol. 35 ›› Issue (2): 23-26.

• 力学 • 上一篇    下一篇

CFL 增强RC 梁的疲劳累积损伤模型

牛鹏志1 黄培彦1 姚国文2 杨怡1 赵琛1   

  1. 1.华南理工大学 交通学院,广东 广州 501640; 2. 重庆交通大学 土木建筑学院,重庆 400074
  • 收稿日期:2005-04-12 出版日期:2007-02-25 发布日期:2007-02-25
  • 通信作者: 牛鹏志(1978-),男,博士生,主要从事疲劳与断裂力学和FRP 片材加固技术研究。 E-mail:Pyhuang@scut. edu. cn
  • 作者简介:牛鹏志(1978-),男,博士生,主要从事疲劳与断裂力学和FRP 片材加固技术研究。
  • 基金资助:

    国家自然科学基金资助项目(10272047,10672060) ;广东省自然科学基金资助项目(020856)

Fatigue Açcumulative Damage Model of RC Beam Strengthened with Carbon Fiber Laminate

Niu Peng-zhiHuang Pei-yαnyao Guo-wenYang YiZhao Chen1   

  1. 1. School of Traffic and Communications , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China;2. College of Civil Engineering and Architecture , Chongqing Jiaotong Univ. , Chongqing 400074 , China
  • Received:2005-04-12 Online:2007-02-25 Published:2007-02-25
  • Contact: 牛鹏志(1978-),男,博士生,主要从事疲劳与断裂力学和FRP 片材加固技术研究。 E-mail:Pyhuang@scut. edu. cn
  • About author:牛鹏志(1978-),男,博士生,主要从事疲劳与断裂力学和FRP 片材加固技术研究。
  • Supported by:

    国家自然科学基金资助项目(10272047,10672060) ;广东省自然科学基金资助项目(020856)

摘要: 通过碳纤维薄板( CFL) 增强钢筋混凝土( RC) 梁的三点弯曲疲劳试验,得到了构件疲劳寿命曲线及其跨中挠度、抗弯刚度的演化规律;采用增强梁的剩余抗弯刚度来定义损伤变量,建立了描述其损伤、断裂过程的疲劳累积损伤模型,并对CFL 增强RC 梁的疲劳损伤演化历程进行了数值分析.结果表明,文中提出的疲劳累积损伤模型能够准确地描述包括混凝土开裂、CFL 与混凝土剥离、钢筋屈服等破坏模式在内的CFL 增强RC 梁的疲劳损伤、破坏过程。

关键词: 破纤维薄板(CFL), 钢筋混凝土(RC) 梁, 疲劳寿命, 累积损伤模型, 抗弯刚度

Abstract:

The three-point hending experiments of the reinforced concrete (RC) heam strengthened with carbon fi-her laminate (CFL) were carried out , and the corresponding fatigue life curve was ohtained. Moreover , the evolu-tion histories of midspan flexihility and hending rigidity of the strengthened heam were descrihed. The residual ben-ding rigidity was then used to define the damage of the strengthened heam. Thus , a fatigue accumulative damage model was proposed to analyze the damage and fracture process of the strengthened heam. The evolution of the fa-tigue damage of the RC heam strengthened with CFL was finally calculated and discussed. The results show that the proposed model can correctly descrihe the damage and failure processes of CFL-strengthened RC heam , including the concrete cracking , the CFL dehonding from the concrete and the yielding of the steel har.

Key words: carhon fiher laminate ( CFL), reinforced concrete ( RC ) beam, fatigue life, accumulative damage model, bending rigidity