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结合某拟建黄河大桥,在大桥桥位附近建立一座高85 m的测风塔,分别在测风塔10 m、30 m、50 m及80 m高度处设立观测层对大桥桥位处风特性进行现场实测,实测风速风向数据采用GPRS传输,基于MATLAB开发了相应的数据处理程序对实测风速数据进行处理。结果表明:桥位处平均风速沿高度方向总体服从幂指数分布,大风状况下风剖面指数拟合值为α=0.167,接近规范推荐的B类地表。大风天气(10 m高度处10 min平均风速大于10 m/s)大风时段10 m高度处风攻角范围为-4.9°~6.7°,80 m高度处风攻角范围为-4.4°~5.3°。桥面高度处脉动风紊流度及风谱等与规范推荐值总体比较接近。
In combination with a proposed Yellow River Bridge, a 85m tall wind tower near the bridge site was set up. The observation winds at the 10m, 30m, 50m and 80m height of the tower were used to determine the wind characteristics at the bridge site Field measurements were taken and the measured wind speed and direction data were transmitted by GPRS. Corresponding data processing procedures were developed based on MATLAB to process the measured wind speed data. The results show that the average wind speed at the bridge site follows the power index distribution along the height direction. The fitting index of the wind profile index under the condition of high winds is α = 0.167, which is close to the B class surface recommended by the code. High winds (10 m / s average wind speed at 10 m height) Wind attack angles range from -4.9 ° to 6.7 ° at winds up to 10 m and from -4.4 ° to 5.3 ° at 80 m . Bridge deck height pulsating wind turbulence and wind spectrum and the recommended values generally close to the standard.