2019 Volume 30 Pages 1-10
In a previous study, the authors carried out a series of running wheel load fatigue tests with stepped incremental loading by using model specimens of highway bridge RC deck slabs and proposed a calculation formula of the punching shear load-carrying capacity and S-N curve of highway RC deck slabs. However, no constant amplitude running wheel fatigue tests were carried out. Therefore, in the present study, constant amplitude running wheel fatigue tests were carried out to verify the validity of application of Miner's rule to fatigue life estimation and the consistency of the S-N curve obtained from our previous study. In addition, the validity of our calculation formula of the punching shear load-carrying capacity in consideration of some design parameters, such as concrete compressive strength, mechanical properties of re-bar and amount of re-bar, was investigated. Consequently, the consistency between the S-N curve obtained from the equivalent number of cycles based on stepped incremental loading fatigue tests results using the punching shear load-carrying capacity (Ps.max) proposed by the authors and the constant amplitude fatigue test results was well verified.