摘要
采用不同种类的黏结树脂制作复材-混凝土双面剪切试件,保持混凝土强度、复材粘贴层数和黏结长度等参数不变,仅将黏结树脂种类作为变化参数,进行疲劳荷载下复材-混凝土界面性能试验。比较疲劳荷载下试件破坏模式、荷载-滑移、复材应变分布、界面黏结-滑移关系等受力指标,分析黏结树脂性能对复材-混凝土界面疲劳受力行为的影响。试验结果表明,在同等疲劳荷载水平下,相比其他树脂,采用柔软树脂的试件平均疲劳寿命相对更高,界面黏结强度、刚度、界面断裂能更大、延性更好;通过液体橡胶对普通树脂进行增韧改性,能够有效改善界面的疲劳受力性能,提高疲劳寿命。
Fiber reinforced polymer(FRP)-to-concrete double-lap shear specimens were fabricated with different bonding adhesives and tested under fatigue loading.The parameters of concrete strength,FRP layers and FRP bonding length were kept unchanged in the tests.By comparing the failure modes,load-slip curves,FRP strain distributions and interfacial bond-slip relationship of the FRP-to-concrete interface under fatigue loading,the effect of bonding adhesive properties on fatigue behavior of FRP-to-concrete interface were analyzed.Test results showed that the specimen with softer bonding adhesive resulted in a longer fatigue life and larger bond strength,interfacial fracture energy,load-slip stiffness and ductility when compared with other specimens under the same fatigue load level.Bond fatigue behavior of FRP-to-concrete interface and fatigue life can be effectively improved by liquid rubber modification based on normal bonding adhesive.
作者
曹文海
施嘉伟
CAO Wenhai;SHI Jiawei(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)
出处
《工业建筑》
CSCD
北大核心
2019年第9期28-35,共8页
Industrial Construction
基金
国家自然科学基金青年科学基金项目(51508157)
关键词
纤维增强复合材料
混凝土
黏结树脂
界面
疲劳
fiber reinforced polymer
concrete
bonding adhesive
interface
fatigue
