Abstract
The strengthening efficiency of externally bonded fibre-reinforced polymer to concrete structure is usually limited owing to the unexpected debonding of fibre-reinforced polymer laminates. In this study, a new steel plate hybrid bonding technique was developed to supply additional anchorage for traditional externally bonded fibre-reinforced polymer strengthening system. With this approach, the fibre-reinforced polymer debonding can be effectively prevented. Moreover, the stress concentration, which probably results in a premature fracture of fibre-reinforced polymer laminates as that performed for available hybrid bonding anchorage techniques, can be eliminated by introducing a steel plate between the mechanical fasteners and fibre-reinforced polymer strips. To verify the effect of this new method, 21 carbon fibre–reinforced polymer–strengthened beams were studied on the flexural behaviours. Test results showed that, compared to available hybrid bonding anchorage techniques, steel plate hybrid bonding is more capable of making the full use of fibre-reinforced polymer laminates and further enhance the ultimate capacity and ductility of externally bonded fibre-reinforced polymer–strengthened beams. Based on the experimental results, the effect of interfacial treatment, ply of carbon fibre–reinforced polymer and mechanical fastener spacing on the failure mode and ultimate load ratio were discussed. Eventually, a simplified analytical procedure was proposed and verified to estimate the flexural resistance of steel plate hybrid bonding – fibre-reinforced polymer–strengthened beam.
Highlights
Owing to its convenience in practical construction, the externally bonded fibre-reinforced polymer (EB-fibrereinforced polymer (FRP)) composites are widely used to strengthen the flexural members such as reinforced concrete (RC) beams and slabs
This failure mode was consistent with available references, which indicated that the 2-ply externally bonded fibre-reinforced polymer (EB-FRP) could not be fully utilized due to the poor interfacial bond behaviour.[8,13,16,24,25]
The results suggest that both the IHB and SPHB techniques could suspend the debonding of carbon fibre–reinforced polymer (CFRP) laminates for most cases
Summary
Owing to its convenience in practical construction, the externally bonded fibre-reinforced polymer (EB-FRP) composites are widely used to strengthen the flexural members such as reinforced concrete (RC) beams and slabs. This suggested that, with IHB technique, the FRP reinforcement might be fractured due to the stress concentration at the location of fasteners before its ultimate tensile strength was reached, whereas this imperfection was overcome by introducing the steel plate in SPHB method.
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