Abstract
The fatigue behavior of RC beams strengthened with fiber reinforced polymer (FRP) is an important subject in civil engineering. In this paper, 18 RC beams (1850×100×200 mm) strengthened with carbon fiber laminate (CFL) are divided into 4 groups and tested to investigate their fatigue behavior under bending loads. Based on the above fatigue testing data and theoretic analyses, following results are obtained: 1) three conceptions of cracking fatigue life, permissive fatigue life and extreme fatigue life are proposed; 2) two kinds of S-N curves and P-S-N curves of RC beams strengthened with CFL are obtained, according to the new conceptions of permissive fatigue lives and extreme fatigue lives; 3) the ratios of permissive fatigue strength and extreme fatigue strength to the ultimate static strength are 65% and 67% respectively.
