FRP-Concrete Bond Behavior: A Parametric Study Through Pull-Off Testing

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Title: FRP-Concrete Bond Behavior: A Parametric Study Through Pull-Off Testing

Author(s): B.M. McSweeney and M.M. Lopez

Publication: Special Publication

Volume: 230

Issue:

Appears on pages(s): 441-460

Keywords: bond behavior; bond modeling; CFRP; concrete; fiber-reinforced composite; pull-off test

Date: 10/1/2005

Abstract:
The sensitivity of the FRP-concrete bond failure load to changes ingeometric and material parameters is described, and initial comparisons to predictionsfrom existing bond models are made. To accomplish this, load and strain data from aseries of single-lap pull-off tests is analyzed, in which carbon fiber reinforced polymer(CFRP) strips of varying width, thickness, and bonded length were pulled from concreteblocks of varying concrete strength. It was found that the concrete compressivestrength had limited effects on the bond failure load, and longer bonded lengthsincreased the time up to failure load. Changes to the bonded width and FRP thicknesshad a significant impact on the bond failure load. Failure load predictions produced bythree studied bond models were found to be strongly influenced by the materialproperties used as input, and were occasionally insensitive to the parameters varied.