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首页> 外文期刊>Journal of Wind Engineering and Industrial Aerodynamics: The Journal of the International Association for Wind Engineering >Design wind loads for tubular-angle steel cross-arms of transmission towers under skewed wind loading
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Design wind loads for tubular-angle steel cross-arms of transmission towers under skewed wind loading

机译：偏斜风荷载下输电塔管形钢制横臂的设计风荷载

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摘要

Wind tunnel tests on two cross-arm models of a 500 kV tubular-angle steel transmission tower at three mean wind speeds were carried out. The drag coefficients in wind directional axis for 19 incidence angles were obtained. The skewed wind load factors, the wind load distribution factors in transversal and longitudinal direction were calculated. Two fitting functions for the skewed wind load factors of tubular-angle steel cross-arms were determined by nonlinear fitting analysis. The, wind incidence angle corresponding to the maximum skewed wind load is near 80 degrees or 85 degrees. With the assumption that the drag coefficients are valued based on the experimental results, the effective projected areas (EPA) of the cross-arms were calculated. The parameters for calculating the skewed wind loads developed from the wind tunnel tests were compared to the regulations in some applicable standards. Suggestions on the drag coefficients, the skewed wind load factors and the wind load distribution factors were proposed. Especially for Chinese standard, the drag coefficient of single member should be substituted by that of the single frame in calculating the global drag coefficients of cross-arms. The transversal wind load for 0 degrees wind incidence angle and the longitudinal wind load for 30 degrees wind incidence angle are conservative. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在500 kV钢管角钢输电塔的两个横臂模型上以三个平均风速进行了风洞测试。获得了风向轴上19个入射角的风阻系数。计算了偏斜风荷载因子，横向和纵向风荷载分布因子。通过非线性拟合分析确定了钢管角钢横臂偏风荷载因子的两个拟合函数。对应于最大偏斜风荷载的风入射角接近80度或85度。假设根据实验结果对阻力系数进行了计算，则计算了横臂的有效投影面积（EPA）。将风洞试验产生的偏斜风荷载的计算参数与一些适用标准中的规定进行了比较。提出了阻力系数，偏风荷载系数和风荷载分布系数的建议。特别是对于中国标准，在计算横臂的整体阻力系数时，应将单个构件的阻力系数替换为单个框架的阻力系数。 0度风入射角的横向风载荷和30度风入射角的纵向风载荷是保守的。 （C）2015 Elsevier Ltd.保留所有权利。

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