Research on Cumulative Fatigue Damage for Vortex-Induced Vibration of Steel Tube Tower

The vortex-induced vibration of steel tube towers greatly affects the operation of transmission lines. The method of accumulation damage is one of the key in fatigue research. In this study, the applicability of cumulative fatigue damage theories is researched for steel tube tower under vortex-induced vibration. An improved Manson-Halford model is proposed based on the concept of equivalent cyclic ratio. The fatigue experiments of typical C-type and X-type joints of the steel tube towers are carried out, the S-N curves and multi-stage loading fatigue experiment data are obtained. The Miner-Palmgren model, improved Ye Duyi model, Manson-Halford model and improved Manson-Halford model are used to estimate the remain fatigue life of the typical joints respectively. The results reveal that the improved Manson-Halford model has certain advantages in the prediction accuracy of remain fatigue life.