温度对CFRP-混凝土界面粘结滑移行为的影响

将粘贴碳纤维(CFRP)粘贴于混凝土表面来加固钢筋混凝土结构的方法,由于施工便捷而被广泛应用。但是粘贴CFRP所用的环氧类胶黏剂对温度过于敏感,明显影响加固效果。尤其是用CFRP加固的混凝土结构的耐火性能很差,限制了这一加固技术的推广。本文在先后2次对不同温度下CFRP-混凝土界面粘结滑移行为试验研究的基础上,结合目前已有的研究成果,对CFRP-混凝土界面粘结滑移行为受温度影响的特性进行评述,并从材性方面对温度对界面的粘结滑移行为的影响进行了机理分析,为分析常温下CFRP加固混凝土结构受力性能和高温(火灾)下防火保护的CFRP加固混凝土结构抗火性能提供了依据。

Influence of Temperature on the Bond-slip Behavior of CFRP-concrete Interface

For its convenience,the method to affix CFRP to the surface of existing reinforced concrete structure was widely used in the strengthening field.Unfortunately,for the adhesive used in affixing CFRP is highly sensitive to temperature,this strengthening method was limited to a relatively narrow field.On the basis of the results of two experiments,the influence of temperature on the bond-slip behavior of interface between CFRP and concrete was studied in this paper.The functional mechanism of temperature on the bond-slip behavior was analyzed from the view of material properties to support the theoretical basis for the commentary.The results can throw light on the research of the mechanical behavior of CFRP-strengthened structure under room temperature and the fire-resisting behavior of strengthened concrete structure under high temperature.