PAPERS |
Takuji KAMADA, Masamichi SOGABE, Yukihiro TANIMURA,
Koji YOSHIDA, Tadatomo WATANABE, Tsutomu SATO
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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