Zhengfa Li, Jianwei Zhang, Haining Wang, and Yijun Bao
Wind vibration response; transmission tower line system; fatigue performance; wind load
High-voltage transmission tower line system is very prone to wind vibration fatigue damage and extreme cases of dynamic collapse damage, so to solve the vibration of the transmission tower line system caused by wind load, the study by building a finite element model to analyse the wind load and wind vibration response, and experimental analysis of the fatigue life of the transmission tower line system and the mechanical properties of the transmission tower under the broken line condition. According to the findings, the pulsating wind speed is within the value range of −20m/s to 20m/s in 200 s, with an overall trend of constant fluctuation, while the displacement, velocity and acceleration response of the five nodes of the transmission tower under the simulated wind load all show the characteristics of small at the bottom and large at the top. In addition, the actual fatigue life of the transmission tower is 50.3 years when the survival rate is 90%, and 21.1 years when the survival rate is 99.9%. Meanwhile, the maximum values of two indicators, maximum displacement at the top and stress value at the stress maximum, appear in the case of working condition 5, which are 2.78 times and 3.43 times of the unbroken case. Taken together, to avoid the damage of transmission lines caused by wind vibration fatigue, the design safety factor of conductors and ground wires should be increased as much as possible, which is of great significance for solving the actual fatigue damage of transmission tower line system under the effect of wind vibration fatigue.
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