ABSTRACT
This paper proposed a new fatigue life prediction method for corroded reinforced concrete (RC) beams incorporating pitting corrosion, fatigue bond degradation, and fatigue damage of concrete. The fatigue damage of concrete is modeled based on plastic strain analysis. For the fatigue bond degradation between corroded steel bars and concrete, a new strain-incompatibility analysis method based on the transfer theory of effective bond stress is developed to quantify the reinforcement slipping in concrete. The fatigue crack growth parameters of steel bars and the corrosion pit-induced stress concentration are experimentally obtained. The stress intensity factor for the crack at the corrosion pit root is calculated by an asymptotic interpolation method. Then, the fatigue failure analysis of corroded RC beams is performed, where the reinforcement fracture, concrete crush, and bond degradation-induced anchorage failure at beam ends are checked. The prediction results agree well with the experimental data.
