The bridge site of Pingtan Strait Road Railway Dual purpose Bridge is located in the hilly area of the southeast coast of Fujian Province, which belongs to the marine monsoon climate. The xx Strait has strong winds, waves, large tidal range, busy shipping, complex topography and geological conditions, and poor natural conditions. In addition, the bridge site area of Pingtan Strait Road Railway Dual purpose Bridge is affected by the monsoon, and the wind direction changes significantly seasonally. The northerly wind prevails in the middle autumn, winter and spring of the year