Preliminary experimental investigation of the fatigue bond behavior of CFRP confined RC beams

摘要

This paper presents the results of the first phase of a study on the effect of the confinement provided by transverse carbon fiber rein forced polymer (CFRP) sheets on the fatigue bond strength of steel reinforcing bars in concrete beams Reinforced cancrete bond-beams 150 x 250 x 2000 mm were tested. The variables examined were the area of the CFRP sheets (none or one U-wrap CFRP sheet),the reinforcing bar diameter (20 or 25 mm) and the load range applied to the specimens. The results showed that increasing the bar diameter increased beams to a diagonal shear faHure for the CFRP wrapped beams, and mechanism for repeated loading is described.