Study on wind characteristics of typhoon muifa on the sutong bridge

Abstract

As a cable-stayed bridge with the longest main span, the Sutong Bridge faces the threat of typhoons every year. Based on field measured data measured at the top of the tower and at the mid-span by anemometers, Typhoon Muifa is analyzed in detail to obtain the wind characteristics, including the mean wind speed and direction, turbulence intensity and gust factor, power spectral density and integral scale of turbulence, etc. The correlated mean wind speeds at the two heights show the reliability of recorded wind data as well as the variation of wind speed with height. Turbulence intensities and gust factors fluctuate in a similar way. The values of integral scales are sensitive in different case. The measured power spectra are particularly compared with Kaimal spectrum, Teunissen spectrum, Harris spectrum, and Davenport spectrum. The results show that the measured spectra cannot fit the code-suggested spectra very well, which exhibits the demand of more accurate spectra. Conclusions obtained in this article can provide references for wind resistance design of super-long-span cable-stayed bridges.