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The differences in mechanical and bond properties of Fiber
Reinforced Polymers (FRP) bars when compared to those of
traditional steel reinforcement for reinforced concrete (RC)
structures may affect the cracking and deformability behaviour of
FRP RC members. This study investigates the bond behaviour between
FRP reinforcement and concrete through experimental and numerical
analysis. Experimental results on pull-out tests and direct tension
tests are presented and discussed. A general procedure, derived
from a cracking analysis based on slip and bond stresses, is used
to study the deformability of FRP RC elements under tension. The
tension stiffening effect is included via experimental nonlinear
bond-slip law obtained from a laboratory pull-out test. The
comparison between experimental data and numerical predictions of
the reinforcement strain profile along the reinforcing bar during a
tensile test confirms that the bond-based model adequately
reproduces the redistribution of stresses after crack formation.
Because the numerical model is flexible enough to include any
"user-defined" bond-slip law and variable materials' properties, a
parametric study is conducted.
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