METHOD OF ESTIMATING FATIGUE DAMAGE OF PIPE MEMBERS UNDER VORTEX SHEDDING

Abstract

It is important to ensure safety of members of truss towers against fatigue damage. Fatigue damage is caused by the facts that the entire steel tower responses by earthquakes and wind, and that individual member is vibrated by the wind. It is especially feared that vibration with vortex shedding occurs in a thin member.
This paper presents method and example of evaluating fatigue damage of pipe member under vortex shedding. In this paper, pipe and connection are modeled by finite elements in order to calculate hot spot stress at welded point. The cumulative time of wind speed in verification time period is evaluated by simplified method proposed by the authors.