Research on non-stationary wind-induced effects and the working mechanism of full scale super-large cooling tower based on field measurement

摘要

Recent measurement results indicate that the wind-induced response of super-large cooling tower (include superlarge cooling tower in wet-cooling-systems and super-large cooling tower in dry-cooling-systems) exhibit remarkable non-stationary feature. In this study, wind-induced response signals of a typical super-large cooling tower under real Reynolds number and turbulent conditions were collected based on field measurement. Meanwhile, some other super-large cooling towers were measured to verify the research in this paper. On these bases, non-stationary and non-Gaussian features of wind-induced response of super-large cooling tower were studied. And evolutionary power spectral density of wind-induced response of super-large cooling tower were analyzed. Furthermore, the resonance effect were discussed by studying proportion of resonance component in wind-induced response. Finally, the extreme response and damping ratios considering non-stationary feature of wind-induced effect were obtained in this paper. The results show that the wind-induced response of super-large cooling tower is characterized by stable frequency evolution characteristics and non-stationary evolution characteristics in intensity aspect. Some detailed research conclusions can provide references for wind resistance safety design of super-large cooling tower and disaster prevention study of similar tall thin-walled structure.