摘要
CFRP板条被广泛应用于钢筋混凝土的加固工程,CFRP板条加固混凝土时常发生粘结界面破坏。本文提出对CFRP开孔并控制孔径和孔距,以增强CFRP与混凝土的粘接界面强度以及CFRP板条与粘结界面的延性,提高构件极限承载力。通过拉拔试验,控制CFRP板条开孔孔径、开孔距离等,探究CFRP板条表面处理以及不同的加固方式对加固效果的影响。试验结果表明:开孔可以显著增加CFRP与混凝土粘结界面的延性,提高加固混凝土构件的塑性性能,且开孔孔径、开孔距离对粘结性能具有一定影响。同时CFRP板条内嵌式加固粘结性能明显优于外贴式加固,更有利于充分发挥CFRP板条强度。
CFRP strips are widely used in concrete reinforcement. The bonding interface between CFRP strips and concrete would suffer failure sometimes. This paper proposed a method by drilling holes on CFRP strips and controlling the diameter and spacing of holes, to enhance the strength and ductility of bonding interface and the uhimate bearing capacity of a reinforced member. The paper, based on the comparative pull-out test of CFRP, studied the influence of different CFRP interface treatment and reinforcement methods on reinforcement efficiency, by changing the diameter and spacing of holes. The test results show that drilling on the FRP strips can dramatically enhance the ductility of the bonding interface between FRP strips and concrete. This method can also promote the plastic properties of CFRP reinforced concrete member. The diameter and spacing of holes have certain impacts on bonding properties. The embedded reinforcement of CFRP makes full use of the strength of CFRP strips, superior to the external bonding reinforcement under the same conditions.
出处
《结构工程师》
北大核心
2016年第2期140-145,F0004,共7页
Structural Engineers
