Experimental Study of Wind Field in Bridge Site Located in Mountainous Area

The ultra long span bridge of Beipan river across the V shape valley is located in a complex terrain.The design reference wind speed and related wind characteristic parameters of the bridge are derived from the wind tunnel test of a terrain model of the bridge site.Results show that the bridge site has no notable magnification effect of wind speed.According to the equivalent load principle,the design reference height on the bridge deck can be described with the equivalent height of bridge deck.The power spectra density of horizontal component and vertical component of fluctuation wind on the bridge deck respectively can be approximately expressed as the spectra of Kaimal and the spectra of Panofsky in low-frequency range of long span bridge under the coming wind from across-bridge directions parallel to the trend of the valley.