PET FRP与混凝土界面黏结行为试验研究

Experimental Study on the Bonding Behavior of PET FRP and Concrete Interface

通过双面剪切试验对24个试件进行高延性纤维增强复合材料(PET FRP)与混凝土界面黏结性能研究,研究参数包括FRP种类、FRP黏结厚度、黏结长度和黏结宽度;分析各参数对PET FRP与混凝土黏结性能的影响,基于试验结果评估现有黏结滑移关系模型,并进行模型修正。研究结果表明,在有效黏结长度内,随着黏结长度的增加,PET FRP与混凝土界面黏结强度增大;当超过有效黏结长度后,增加PET FRP黏结长度不能明显增加界面黏结强度,但可提高试件破坏的延性;增加PET FRP黏结宽度可提高界面黏结强度,但会受PET FRP黏结宽度和混凝土宽度比值的影响;当界面刚度接近时,碳纤维增强复合材料(CFRP)与混凝土界面黏结强度远小于PET FRP与混凝土界面黏结强度。

The interfacial properties of PET FRP and concrete were studied on 24 specimens through double shear test.The test parameters included FRP type,PET FRP bonding thickness,length and width.The influence of each parameter on the result was analyzed in detail.Results showed that within the effective bonding length,as the length increases,the bond strength also increases.When the effective bond length was exceeded,increasing the bond length could not significantly increase its bond strength,but it could increase the ductility of failure.Increasing the bonding width of PET FRP could also increase the interface bonding strength,but it would be affected by the ratio of the bonding width of PET FRP to the width of the concrete.When the interface stiffness is close,the bond strength between CFRP and concrete is much smaller than that of PET FRP.Based on the experimental results,the existing bond-slip relationship model was evaluated and model corrections were made.