Collapse analysis on 500kV transmission tower under combined action of typhoon and microtopography

Abstract

This paper studies the stress state and collapse cause of transmission tower of 500kV Zhangquan II line under the combined action of wind speed, wind direction and wind speed up effect when Typhoon Meranti passes Xiamen. Based on the historical meteorological data and the destruction pattern of the tower, the input conditions of wind speed and direction which are most likely to cause the tower to collapse are determined. Based on CFD simulation analysis, the wind speed-up factor of 24 wind angles at the inverted tower position was determined, and the stress of the main member and inclined member under two wind angles conforming to the site failure pattern was analyzed, and the internal relationship between the failure pattern of transmission tower and wind speed, wind direction and wind speed up factor was clarified. The influence of wind speed, wind direction and wind speed up effect which widely existing in mountainous region should be considered comprehensively in the design of Fujian coastal high voltage transmission line to against typhoon.