Q420大截面角钢在特高压输电线路中的应用

结合大截面角钢的截面特性，通过理论分析计算出了大角钢及部分十字双角钢的临界计算长度，并分析了设计中对大角钢和十字双角钢的应力比控制情况；以糯扎渡送电广东±800kV直流线路中的J2713塔作为实例，通过建立大角钢和十字双角钢2种模型，经过优化计算，并对设计结果和经济效益进行分析比较，Q420大角钢值得大规模推广应用的结论。

Applications of Q420 Large Section Angle Steel in UHV Power Transmission Line

Considering the section characteristic of large width angle steel, the critical effective length of large width angle steel and part of crisscross double built-up angle steel is calculated through theoretical analysis. The stress ratio control of large width angle steel and crisscross double built-up angle steel in the project design is analyzed. Taking the J2713 tower in ±800 kV DC transmission line from Nuozhadu to Guangdong Province as an example, this paper analyzes the design result and economic efficiency through establishing double models of large width angle steel and crisscross double built-up angle steel, and optimizing calculation, and concludes that the Q420 large width angle steel is worthy of large-scale application.