Modeling of FRP-Concrete Bond Using Nonlinear Damage Mechanics


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Title: Modeling of FRP-Concrete Bond Using Nonlinear Damage Mechanics

Author(s): C.A. Coronado and M.M. Lopez

Publication: Special Publication

Volume: 230


Appears on pages(s): 373-390

Keywords: concrete-epoxy interface; finite element modeling; fractureenergy; FRP laminate; numerical modeling; plastic damage; pull-offbond test; softening curve

Date: 10/1/2005

In this study, experimental and numerical procedures are proposed topredict the debonding failure of concrete elements strengthened with fiber-reinforcedpolymers (FRP). The experimental tests were designed to obtain the tensile softeningcurve and fracture energy of the concrete-epoxy interface. Results indicate that thefracture energies of plain concrete and concrete-epoxy interface are different inmagnitude. The numerical simulations were conducted using a plastic-damage model.In this approach, the damage is defined using the tensile softening curve. Numericalresults were validated against experimental results obtained from pull-off bond tests.The numerical models were capable of predicting the experimentally observed load-strain, strain distributions, failure load, and failure mechanism of the pull-offspecimens.