Wind resistance capability analysis of high-voltage transmission tower considering double horizontal ESWL distribution

A reasonable wind load model is a prerequisite for the wind-resistant design and reinforcement of high-voltage transmission lines in strong wind-affected areas. The current design codes used to neglect the contributions of transversal wind forces on the tower, which can lead to significant discrepancies between the simulated wind-induced responses and the actual conditions. This study adopts the inertial wind load (IWL) approach to consider the equivalent static wind load (ESWL) on transmission towers in double horizontal directions. Taking a typical transmission tower as the study object, the distribution of IWL in double horizontal directions is discussed, along with a comparison to the specified distributions in DL/T 5557-2018; the wind-resistance capacity and wind-induced failure modes are evaluated through the nonlinear static pushover analysis. It is found that ignoring transversal wind force contributions, the wind resistance capacity of the transmission tower could be overestimated, and the determination of the most unfavorable wind direction and failure modes of the transmission line would be affected. Considering the ESWL in double horizontal directions to improve the wind-resistant capability of transmission lines is necessary.