A FRACTURE-BASED MODEL FOR DEBONDING OF FRP PLATE FROM CONCRETE SUBSTRATE

Abstract eng:
For concrete beams and slabs strengthened with bonded fiber reinforced plastic (FRP) plates, failure may occur in a brittle manner through debonding of the plate from the concrete substrate. In this paper, the debonding process is modeled as the propagation of a crack along the FRP/concrete interface, with frictional shear stress acting behind the crack tip. Following experimental results, the magnitude of the shear stress is taken to decrease linearly with interfacial sliding. Considering crack propagation to occur once the net energy release rate of the system equals the interfacial fracture energy, the applied load on a bonded FRP plate corresponding to any debonded length can be found. From the analytical results, an interesting observation can be made. With the definition of an effective interfacial shear strength, the relatively simple strength-based analysis can produce very similar results to the more complicated fracturebased analysis. With this finding, debonding analysis in the general case can be greatly simplified.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket