Effects on the Fatigue Lives of RC Beams Strengthened with CFL at Elevated Temperature under Cyclic Bending Loads

摘要

The fatigue behavior of RC beams strengthened with carbon fiber laminate (CFL) was experimental studied and theoretical analyzed under cyclic bending loads in several different temperatures (5°C, 20°C, 50°C and 80°C), which the temperatures approached the weather in subtropical zone such as southern China. The effect of the temperature on fatigue lives of the RC beams strengthened with CFL was discussed. Furthermore, a calculation equation of the fatigue lives of the strengthened beams was proposed under the coupling action from the temperature and the load conditions. Using the equation, the fatigue lives and fatigue limits of the RC beams strengthened with CFL were estimated accurately from the coupling action from the temperatures and the bending loads. The preliminary validity check was completed with the verify tests.