Structural Dynamic Analysis and Static Stability Analysis of Drum-Type Self-Standing Power Transmission Towers

Power transmission towers are the support point of transmission lines in power system. With the increase of voltage level and the development of UHV transmission, the stability and safety of power transmission towers has been paid more attention. At present, it is an effective method to design and verify power transmission towers by analyzing structural and mechanical characteristics of power transmission towers with finite element analysis software. The characteristic analysis of power transmission towers is mainly divided into static analysis and dynamic analysis. The two bases are buckling analysis and modal analysis respectively. In this paper, aiming at drum-type self-supporting power transmission towers, finite element simulation model of power transmission towers is established by using finite element software ANSYS. Further more, Modal analysis and buckling analysis of strong wind load under different wind directions are carried out. The results show that the first-order natural frequency of power transmission towers is 2.02, which is close to the result of empirical formula 2.05. The low-order vibration modes of power transmission towers are mainly flat bending, while the high-order vibration modes are mainly local torsion. The main materials and adjacent auxiliary materials in the lower section of the tower body are weak parts, so reinforcement and improvement are required. Eigenvalue buckling analysis and nonlinear buckling analysis both show that the tower structure is most likely to destabilize when the wind direction angle is 90°, and the results of Eigenvalue buckling analysis are more conservative, which must be based on the results of nonlinear buckling analysis.