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Abstract
A total of seven concrete beams (150x300x3000 mm) were constructed and tested at the structural laboratory of Ain Shams University. The beams were
tested under four point bending to evaluate the effectiveness of the
strengthening schemes.
The influence of the type of the bonding agent, number of plies and the
arrangement of the U-wraps along the length of the concrete beams are
investigated. Test results showed that SRP could improve both the flexural
stiffness and the ultimate load carrying capacity considerably. The flexural capacity was increased by more than 300% using multiple plies of SRP
sheets. For the majority of the tested beams, failure was dominated by
delamination of the sheets from the concrete surface. Using U-wraps along
the length of the beam prevented this type of failure and allowed full
utilization of the tensile strength of the sheets.
The parameters include the number of plies, unsupported length of SRP
sheets and the adhesive thickness are investigated. The proposed analytical
model based on plate end debonding (Malek, 1998 and modified by Hassan,
2002) is used to compare the predicted results with the experimental results,
The results were discussed also in the light of the IC debonding models of
Rosenboom et al. (2006) and Z.S.Wu et al. (2008).