Abstract:Abstract: Taking Sanshui River Bridge as engineering background, the wind field characteristics of bridge site located in west valley region derived from the wind tunnel test of a terrain model. Analysis the change of wind speed profile, turbulence intensity, turbulence integral scale and turbulence spectrum with different wind directions in west valley region. According to the similarity relation of the gradient wind speed, combine with the gradient wind speed of wind-resistant design code, a method of calculating design wind speed of bridge by the wind speed profile and height of the gradient wind speed measured at the bridge site in wind tunnel test was proposed. Test results show that the wind speed profile has the power-law relationship when the coming wind parallel to the trend of the valley. Other directions cannot be simulated by a uniform power-law relationship. The power exponent of wind speed profile parallel to the trend of the valley is littler than the other directions, and the value is equal to 0.142. The intensity of turbulence is largest in the valley, especially near the side slope, and the value is bigger than 15% at the height of bridge deck near midspan. The wind speed is attenuation rather than amplification compared to the coming wind speed, because the bridge located in valley, so bridge site has no notable magnification effect of wind speed. When considering the turbulence integral scale and turbulence spectrum, the shape of mountain on both sides should be taken into account.
白桦 李加武 刘健新 . 西部河谷地区三水河桥址风场特性试验研究[J]. , 2012, 31(14): 74-78.
BAI Hua;LI Jia-wu;LIU Jian-xin. Experimental study of wind field characteristics of Sanshui river bridge site located in west valley region. , 2012, 31(14): 74-78.