Collapse Mechanism of Transmission Tower Subjected to Strong Wind Load and Dynamic Response of Tower-Line System

Transmission towers are prone to collapse under strong wind load, resulting in significant economic losses. In order investigate the mechanism and failure modes of transmission tower load whether vibration factor can greatly reflect increasing effect fluctuating wind, finite element method (FEM) is utilized analyze ultimate bearing capacity a typical 220 kV tower. The results show that loads usually due buckling leg members. When reference speed equal 27 m/s, small part main members reaches their yield strength, while diagonal still elastic range, deformation unapparent at this speed. or greater than 30 growing variety legs totally into plastic stage, overall visible. Therefore, collapsed large caused by elastic-plastic Based on aforementioned study, model involving three four span lines established dynamic response tower-line system below wind. Results wind-induced coefficients designed current code not only notably satisfy stress components subjected phase but also accurately assess displacement top unfortunately, could considerably reply with investigated factor, load-carrying be overestimated static calculation results.