FIELD MEASUREMENTS ON WIND CHARACTERISTICS OF TYPHOON WIPHA AT THE RUNYANG SUSPENSION BRIDGE

Located in the coastal aera of eastern China, the Runyang Suspension Bridge (RSB) has been suffered from the typhoons every year after the opening of the bridge in 2005. In order to gain the real typhoon characteristics at the RSB and find the typhoon characteristic database, an ultrasonic anemometer has been installed on the top of the south tower. When typhoon Wipha passed through Jiangsu in Septemper 2007, the 3-dimensional strong wind data was wholly recorded by the anemometer. The measurement data are analyzed to obtain the mean wind speed and the direction, the turbulence intensity, the gust factors, the turbulence integral length and power spectrum, etc. By comparing with the wind characteristic analytical results of typhoon Matsa and the advice values of corresponding codes, the characteristics and rules of typhoons at the RSB area is summarized. The results can provide reliable basis for the wind resistance evaluation of RSB, and have reference values for the wind resistance study of other engineering structures in the region.