ReeveB. Zachary - Effect of adhesive stiffness and CFRP geometry on the behavior

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Effect of adhesive stiffness and CFRP geometry

Author: Reeve Benjamin Zachary | Size: 2.54 MB | Format: PDF | Quality: Original preprint | Publisher: University of Pittsburgh | Year: 2005 | pages: 110

The current American Concrete Institute (ACI) recommendation intended to mitigate
debonding failure by limiting the allowable strain in the FRP (the limiting strain is referred to as
εfub) is shown to be non-conservative, overestimating the strain where debonding becomes likely
by two fold for the high modulus adhesive and less so for the low modulus adhesive. The
equation for estimating εfubrecommended by Teng et al. (2001), including the modifying kbterm,
appears to provide appropriatelyconservative estimates of debonding for the specimens having
low modulus adhesive although remains unconservative for the high modulus adhesive. This
indicates that the nature of the adhesive should be included in the calculation of limiting strain.
Proposed values for the coefficient kwhich accounts for the b b f/b ratio were found to generally
underestimate the effect of the width ratio for the test specimens. Therefore, not only is the ratio
bf/b (as represented by kb) a contributing factor to bond behavior, its contribution may be
underestimated. Cover delamination (end peel debonding) was effectively mitigated in all
specimens by extending the CFRP close to the support along the relatively long shear span.

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