Abstract:

In order to analyze the influences of new edition of Chinese load code on wind-induced vibration of transmission towers, wind velocity time history on a ultra-high voltage （UHV） transmission tower was simulated by linear filtering method, considering the spatial correlation. Based on the analyses of dynamic property of the structure with using finite element method, influences of turbulence intensity on the displacement response and acceleration response of transmission tower structure were compared in new and old load codes. Wind-induced vibration coefficients were calculated according to simulated results, and they were compared with those coefficients calculated in new and old load codes. The results have shown that the wind-induced vibration has an increase by 20% and has different degrees of improvement at different heights, due to the increase of turbulence intensity and peak factor for 10-m height in new load code, while steel damping ratio being unchanged.

Key words: transmission tower, wind-induced vibration coefficient, load code, wind load