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基于100m高测风塔上风速仪的现场实测数据,获得了开阔地貌台风风场的平均风速剖面与湍流度剖面模型。在大气边界层风洞中准确模拟了台风风场和《建筑结构荷载规范》(GB 50009—2001)规定的B类风场,并通过一个大跨刚性模型测压试验,详细分析与对比了两类风场条件下大跨屋面风荷载分布规律特征。研究结果表明:在开阔场地条件下,台风近地边界层平均风速沿高度分布符合对数律,亦满足指数律,风剖面幂指数介于规范规定的A类风场与B类风场之间,平均湍流度比B类风场规定值大1倍;台风风场作用下,开阔地貌大跨结构屋面风荷载受湍流度的影响远高于受平均风速剖面的影响,体型系数随湍流度的增大而增大,屋面风荷载亦随之增大。
Based on the field measured data of the anemometer on the 100m high wind tower, the average wind speed profile and turbulence profile model of the typhoon open wind field were obtained. In the atmospheric boundary layer wind tunnel, the typhoon wind field and the B wind field specified in the “Loading Code for Building Structures” (GB 50009-2001) were accurately simulated, and a large-span rigid model pressure test was conducted to analyze and compare the two in detail. Characteristics of wind load distribution characteristics of large span roof under wind conditions . The results show that under open field conditions, the mean wind speed of the typhoon near boundary layer conforms to the logarithm law along the height distribution, and also satisfies the exponential law. The wind section power index is between the Class A wind field and the Class B wind field specified in the specification. The average turbulence degree is 1 time larger than the specified value of Class B wind field. Under the action of typhoon wind field, the wind load of roof with long-span geomorphic structure is greatly affected by the turbulence degree, and the effect of turbulence is greater than the average wind speed profile. As the size increases, the wind load on the roof increases.