摘要
通过5根钢筋混凝土梁的抗弯疲劳试验,研究玄武岩纤维布、玄武岩/碳混杂纤维布、玻璃/碳混杂纤维布加固梁的变幅疲劳寿命,并根据Miner损伤理论、修正Miner损伤理论和Corten-Dolan损伤理论,对承受变幅疲劳载荷作用的FRP加固钢筋混凝土梁进行了疲劳寿命估算。结果表明,粘贴纤维布对钢筋混凝土梁的抗疲劳性能有极大改善,能显著提高梁的疲劳寿命;3种损伤理论估算出的寿命均偏安全,以修正Miner损伤理论的精度最好。建议在实际工程应用中采用修正Miner损伤理论进行FRP加固钢筋混凝土受弯构件的变幅疲劳寿命估算。
The flexural fatigue test on 5 reinforced concrete beams is conducted, in which the variable amplitude fatigue lives of RC beams strengthened with basalt fiber sheets,basalt / carbon hybrid fiber sheets and glass / carbon hybrid fiber sheets are studied. According to Miner＇ s damage theory,modified Miner＇ s damage theory and Corten-Dolan damage theory,the fatigue life of RC beams strengthened with FRP under variable amplitude fatigue loading is estimated. The result shows that（ 1） the fatigue performance of fiber sheet strengthened beams has been greatly improved,and the fatigue life has been significantly increased;（ 2） the life estimation values based on the 3 damage theories are conservative,and the modified Miner＇s damage theory can better predict the fatigue life of specimens. It is suggested to use the modified Miner＇ s damage theory in estimating the variable amplitude fatigue life of reinforced concrete flexural members strengthened with FRP in practical engineering.
作者
陈绪军
戴木香
朱晓娥
CHEN Xu-jun DAI Mu-xiang ZHU Xiao-e(School of Civil Engineering and Urban Construction, Jiujiang University, Jiujiang Jiangxi 332005, Chin)
出处
《公路交通科技》
CAS
CSCD
北大核心
2017年第2期75-80,共6页
Journal of Highway and Transportation Research and Development
基金
江西省自然科学基金项目(20142BAB216004)
江西省教育厅青年科学基金项目(GJJ13712)
关键词
桥梁工程
钢筋混凝土梁
损伤累积理论
变幅疲劳寿命
BFRP布
加固
bridge engineering
reinforced concrete beam
damage accumulation theory
variable amplitude fatigue life
BFRP sheet
strengthening
