Abstract
Abstract In previous reports, it was shown that the cumulative absolute velocity (CAV) for each wave of the pipe seismic response corresponds to the vibration stress amplitude. A new seismic fatigue evaluation method was proposed by applying this relationship to Miner’s law of material fatigue damage. As a result, the cumulative fatigue damage can be calculated in proportion to the CAV of each wave to the power of 2.4. In this study, how the new method can be used to evaluate the cumulative fatigue damage quantitatively is considered. The cumulative fatigue damage was evaluated by the rain flow method as well as the new method where the parameters showing the effect of the concentrated mass and the pipe configuration on the vibration stress-velocity relationship were calculated accurately using the precisely analyzed mode function. The two results were found to be in good agreement. It is considered that this new method can give the evaluation result that envelops the pipes of the entire plant by appropriately setting the parameters.
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