WIND-RESISTANT RELIABILITY ANALYSIS OF UHV TRANSMISSION TOWER BASED ON MOMENT METHODS

This paper analyzes the wind-resistant reliability of UHV transmission tower. A moment method based on the equivalent extreme-value event is introduced to study the system reliability of UHV transmission tower under a random equivalent static wind load. By using point estimate methods for probability moments, the reliability index and the failure probability are obtained through this moment method. A numerical example of 1000kV UHV transmission tower indicates that: 1) being very simple and effective, the moment method can be applied to UHV transmission tower reliability analysis and is of great significance and practical engineering value; 2) the number of estimating points based on the point estimate methods for probability moments should depend on the convergence of failure probability, which means that it is not reasonable to choose freely or to attain the more the better.