Abstract:
A wind risk assessment method based on performance-based wind engineering (PBWE) framework is proposed to assess the wind-induced damage and loss of the ultra-high voltage (UHV) converter station valve hall roof system in the northwest region of China. A wind tunnel test is conducted to determine the extreme wind pressure on the valve hall roof. The wind speed probability distribution and wind hazard in the Hami region of Xinjiang are determined using the measured data from the meteorological station. Based on the valve hall roof system finite element analysis, the wind fragility analysis and wind risk assessment in multiple wind directions are carried out using the aforementioned method, and the effect of wind direction is discussed. The results show that the highest wind hazard is in the southeast (NE) wind direction of the Hami region. The damage probability (wind fragility) and the annual failure probability (wind risk) of the valve hall roof system increase first and then decrease with increasing wind angle (0º~90º), and the sensitivity to wind angle increases with the development of damage state. The wind-induced damage to the UHV converter station valve hall roof system in the Hami region mainly occurs in the range of slight damage to severe damage, and almost no occlusion failure. It is recommended to construct the valve hall in the southeast-northwest (SE-NW).