微地形区域输电线路杆塔电线风荷载计算方法

Calculation Method of Line Wind Load of Transmission Tower Structure Considering Small-Scale Topographic Features

微地形对输电线路有着显著影响,但在现有的输电线路设计规程中,针对微地形区域的输电线路杆塔结构风荷载设计较为简单或模糊。基于输电线路微地形、微气象概念,推导了作用在杆塔结构上的线条风荷载的计算方法。通过计算一典型档距的典型杆塔在平地和不同微地形的风荷载,比较了不同设计方法的差别,进而反映微地形对输电线路杆塔结构的影响,提出了设计建议,可供结构设计及分析人员参考。

There is conspicuous influence of small-scale topographic features on transmission lines, however in existing design codes the method to calculate wind load of transmission tower structure in small-scale topographic district is too simple and unclear. The concepts of small-scale topographic district and micrometeorology in the design of transmission lines as well as existing design methods were concisely introduced, and the line wind loads acting on transmission tower structure were analyzed. Through the calculation of wind loads of a typical tower for a typical scan in flat ground and in districts with different sma｜｜-scale topographic features, the differences among different existing design methods were compared, and then the influences of small-scale topographic features on transmission tower structure were reflected. Finally, related suggestions on the design were proposed. The research results were available for reference to the personnel engaged in the design and analysis of structural design.