Analysis of Scaling and Instability in FRP-Concrete Shear Debonding for Beam-Strengthening Applications

摘要: The debonding mode of failure, which is observed in girders strengthened using externally attached fiber-reinforced polymer (FRP) sheets, studied this paper. A numerical analysis the direct-shear response FRP to concrete substrate performed study initiation, formation, and propagation an interfacial crack between two adherents. material bimaterial interface, includes postpeak softening, incorporated into model. load obtained numerically shown be close agreement with that determined experimentally from direct shear tests on blocks sheets. An instability predicted failure arc-length method used obtain entire past displacement-limit point. a result snapback, where both displacement decrease simultaneously. effect bonded length stress transfer ultimate also analyzed. It there scaling capacity when does not allow for establishment full stress-transfer zone associated interface growth. From results analysis, fundamental understanding at members developed. Using simple energy based formulation; it girders, complete translates explosive sudden release energy.