输电线路导地线阵风响应计算与比较

风荷载是输电线路设计的主要控制荷载,规范中导地线风荷载计算采用了风荷载调整系数,但规范并未给出物理含义。以风工程理论为基础,推导了导地线风振系数计算公式,并选取参数进行了风振系数计算,将计算结果与中国规范、ASCE 74、BS EN 50341和IEC 60826的风振系数进行比较,结果表明：推导公式的风振系数与国外规范规定数值比较接近,中国线路规范导地线风荷载计算未考虑脉动风影响,导致其计算结果偏不安全。

Computation and Comparison for Gust Response of Wires of Transmission Line

Wind load is the main controlling load in the design of transmission line. The wind load adjustment coefficient is adopted for computing wire load in China’s code. However, the physical meaning of the coefficient is not clear in the code. Based on the wind engineering theory, a formula is deduced for calculating the gust response coefficient of wire, and parameters are chosen to calculate the value. Compared with the coefficients designated in such codes as China’s code, ASCE 74, BS EN 50341 and IEC 60826, the calculated coeffficient with the deduced formula is close to the designated value of ASCE 74, BS EN 50341 and IEC 60826. While the effects of fluctuating wind is not considered in China’s code, the wire wind load calculated according to China’s code is lower than the real load.