东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2013, Vol. 34 ›› Issue (8): 1192-1195.DOI: -

• 资源与土木工程 • 上一篇    下一篇

恒幅循环荷载作用下FRP加固桥梁疲劳寿命预测

李明1，朱浮声1，王丽丽2   

  1. (1.东北大学资源与土木工程学院，辽宁沈阳110819；2.中铁十三局集团第一工程有限公司，辽宁沈阳110000)
  • 收稿日期:2012-12-14 修回日期:2012-12-14 出版日期:2013-08-15 发布日期:2013-03-22
  • 通讯作者: 李明
  • 作者简介:李明(1980-)，男，吉林双辽人，东北大学博士研究生；朱浮声(1948-)，男，辽宁沈阳人，东北大学教授，博士生导师.
  • 基金资助:
    辽宁省交通厅重点科研项目(200920).

Fatigue Life Prediction of FRP Reinforced Bridge Under Constant Amplitude Loading

LI Ming1， ZHU Fusheng1， WANG Lili2   

  1. 1. School of Resources ＆ Civil Engineering， Northeastern University， Shenyang 110819， China; 2. China Railway 13th Bureau Group 1st Engineering Co.， Ltd.， Shenyang 110000， China.
  • Received:2012-12-14 Revised:2012-12-14 Online:2013-08-15 Published:2013-03-22
  • Contact: LI Ming
  • About author:-
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摘要： 在线性渐进叠加假定的基础上，理论推导了三点弯曲荷载下FRP加固桥梁应力强度因子的计算公式，并结合FRP加固桥梁疲劳裂纹扩展试验，分析了FRP加固梁裂纹的扩展行为，验证了裂缝口张开位移CMOD的经验公式可用于计算标准三点弯曲梁的裂缝口张开位移，进而计算断裂模型中梁的临界有效裂缝长度.利用线弹性断裂力学中应力强度因子对疲劳裂纹扩展进行定量描述，进而对FRP加固桥梁的疲劳寿命进行预估算研究.

关键词: 纤维增强复合塑料, 恒幅载荷, 裂纹扩展, 疲劳寿命, 应力强度因子

Abstract: Based on the assumption of linear asymptotic superposition， the formulae for computing a stress intensity factor of an FRPreinforced bridge under threepoint bending were deduced theoretically. The fatigue crack propagation of the bridge was analyzed through experiments， and it was verified that the empirical formula for the crack mouth opening displacement (CMOD) can be used to calculate the CMOD of a beam under threepoint bending， by which the critical effective crack length of the bridge in a fracture model was calculated. Fatigue crack growth was quantitatively described via the stress intensity factor in linear elastic fracture mechanics， thus the fatigue life of an FRPreinforced bridge was forecasted.

Key words: fiber reinforced plastics (FRP), constant amplitude loading, crack growth, fatigue life, stress intensity factor (SIF)

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