Abstract
Debonding failure is the main failure mode in flexurally strengthened reinforced concrete beams by externally bonded or near surface mounted fibre reinforced polymer (FRP) composites. It is believed that FRP debonding will be initiated if the shear stress on the concrete-FRP interface reaches the tensile strength of concrete. However, it was found through experimental and analytical studies that the debonding mechanism of FRP composites has the potential of shear failure in combination with debonding failure. Moreover, the shear failure probably influences the debonding failure. Presently, there are very little experimental and analytical studies to investigate the influence of shear resistance of reinforced concrete (RC) beam on FRP debonding failure. The current study investigates and analyzes the effect of shear resistance on FRP debonding failure based on test results. The analytical results show that the shear resistance of RC beam has a great effect on flexural debonding load-carrying capacity of FRP-strengthened RC beam. The influence of shear resistance on flexural debonding load-carrying capacity must be fully considered in flexural strengthening design of RC beams.
Highlights
Debonding failure is the dominant failure mode in flexurally fiber reinforced polymer (FRP)-strengthened reinforced concrete (RC) beams by externally bonded or near surface mounted FRP composites
End debonding failure can be prevented by ensuring effective bond length of FRP composites [2,3,4,5,6]
There are 22 FRP-strengthened RC beams in series A1, A2, B1, B2, C1, and C2. 19 of them failed by IC debonding, their debonding process and characteristics are all the same
Summary
Debonding failure is the dominant failure mode in flexurally fiber reinforced polymer (FRP)-strengthened reinforced concrete (RC) beams by externally bonded or near surface mounted FRP composites. According to initial debonding position, debonding failure is classified into two types: end debonding and intermediate crack induced debonding (IC debonding). End debonding failure can be prevented by ensuring effective bond length of FRP composites [2,3,4,5,6]. Some fracture mechanics analyses confirmed that the extension of bond length beyond effective bond length has no effect on debonding capacity [7,8,9,10]. Kim and Harris conducted a statistical analysis of failure modes on 230 FRP-strengthened
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