Determination Method for Basic Design Wind Speed of Mountainous-Valley Bridge

In order to provide a valuable parameter for the design of mountainous-valley bridges, a long-span suspension bridge was taken as an engineering example. Under the circumstance of lacking wind speed data at the bridge site, based on meteorological stations' statistics around the bridge site the meteorology analysis method was applied to calculate the maximum wind speed. The extreme-value type I method and the virtual standard weather station method were respectively adopted to calculate 100-year maximum wind speed at the bridge site, the two calculated results of 100-year maximum wind speed were compared, and the bigger one in the two results was selected conservatively as the basic wind speed at the bridge site. At last, the basic design wind speed was determined by topographic correction. The research results show that the basic design wind speed at the bridge site calculated by the meteorology analysis method is smaller than that calculated by the virtual weather station method, so under the condition lacking statistics of the wind speed at the bridge site, the basic design wind speed based on the virtual weather station method should be adopted as the basic design wind speed.