Fatigue cracks were initiated at slotted tubular joints in a testing overhead transmission tower. It was estimated that the cracks were caused by vortex induced vibration (VIV). In this study, the fatigue evaluation for steel tub ular memb ers in the tower was conducted with observed wind data and a response estimation method for VIV. The fatigue damage ratios of horizontal members and web members on the north side of the tower were good agreement with the actual failure state. However, those of members in the cross arm section were low accuracy because stress ranges were similar to the cut-off limit and wind was disturbed by upwind members Moreover, it was clarified that slenderness ratio of a member with a high fatigue damage ratio was limited to a certain range.
