Dependency of stress acting on pipeline on natural frequency during earthquake

Abstract

A simplified analysis was conducted, and it was explained that the response spectrum of the cumulative fatigue damage value of the cantilever pipe with concentrated mass attached to the tip markedly decreases with increasing natural frequency. In addition, the validity of the analysis was shown by response analysis using actual earthquake motions in the first part of this paper. By the way, in same case it is said that there are cases where the response to high frequency acceleration is a problem for the piping system at the earthquake. Therefore, using the above concept, it is shown that the response of the cumulative fatigue damage at the resonance frequency for the sinusoidal excitation can remarkably decreases with increasing the vibration frequency of the excitation acceleration in the second part of the paper.