We performed fatigue experiments to evaluate the fatigue strength of reinforcing steel used in railway concrete structures that are subjected to high-frequency loading and examined a design method to appropriately reflect the evaluation results. For this purpose, we first executed a fatigue test to deformed bars at a frequency over 10⁷ and revaluated its S-N curve. Next, we applied the modified Miner rule to the fatigue design method and proposed the most appropriate concrete design procedure. After that, we implemented a case study on actual structures subjected to repetitive train loading, in order to compare the new method with that used in the past. As a result, we found that the safety level by the new method was 10 to 30% higher to verify its validity.

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