360°风作用下线条风荷载分配系数特性

线条风荷载的准确计算是输电杆塔设计的关键一步,角度风荷载分配系数的选取是否合理将直接影响到设计指标的合理性。对常规线条风荷载（0.5Φ₁=0.5Φ₂=0）的计算原理进行梳理和分析,得到了0~90°范围内的角度风荷载分配系数。同时,通过对风向角θ和线路转角Φ的剖析,推导了线路前后侧360°风吹时的线条角度风荷载分配系数计算公式,并给出了前后侧挡距不同分配比例（0.5Φ₁=0.5Φ₂,0.5L₁∶0.5L₂=5∶5、4∶6、3∶7）时的线条角度风荷载分配系数,分析了分配系数的特点,并进行了对比研究。研究结果揭示了线条角度风荷载分配系数的特点,可作为输电杆塔抗风设计的一种参考。

Study on Distribution Coefficient Characteristics of Wind Load with 0-360 °Angles for Power Transmission Lines

Accurate calculation of wind loads on power lines is critical in designing transmission towers. Selection of the distribution coefficients of angle wind loads directly affects the rationality of design specifications. The calculation principles of linear wind load in general design conditions (0.5Φ₁=0.5Φ₂=0) are analyzed in this paper, and the distribution coefficients corresponding to winds with angles of 0-90 degrees are obtained. Moreover, the calculation formula for distribution coefficient of winds with angles of 0-360 degrees is also derived based on an analysis of the wind angle and line angle. The front and back side wind load distribution coefficients for different allocation ratios(i.e., 0.5Φ₁=0.5Φ₂, 0.5L₁∶0.5L₂=5∶5, 4∶6, 3∶7) are calculated, respectively, and their characteristics are analyzed and a comparison study is made. The study result reveals the characteristics of wind load distribution coefficient of transmission lines and can be used as a reference for designing transmission towers.