Abstract
To evaluate the fatigue resistance of RC slabs has been determined by fatigue tests under running wheel loads, the equivalnt running frequency, or inverse of the slope of the S-N curve, proposed by Matsui et al. was used. However, the application of this frequency to the reinforced RC slabs of actual bridges makes differences in fatigue life. The authors conducted a fatigue test on the RC slabs overlaid with the SFRC under running wheel loads to obtain the D-N curve as a function of the equivalnt running frequency, and proposed an equation for the equivalnt running frequency for the RC slabs overlaid with the SFRC thattook into account the factor of deterioration due to deflection of the RC slabs, the factor of deterioration of materials under wet conditions, the factor of deterioration under environmental conditions, and the correction factor for design standards. As a result, the fatigue life determined from the equation agreed well with the time when the RC slabs overlaid with the SFRC of actual bridges need to be repaired again.
