典型格构式结构风荷载及风致响应规范比较

对国内外四种常见格构式结构荷载规范中风荷载计算方法、关键参数取值等进行详细对比分析，以典型500 kV单回路酒杯型输电塔为例，将规范计算所得风荷载与风洞测力试验所测风荷载进行比较，计算结构的风致响应。对比分析发现，相同条件下（50年重现期）不同规范对同一输电塔结构的等效风荷载存在一定差异。随节段高度增加，我国规范GB50545的等效静力风荷载偏大。据规范计算所得风致响应值与据测力风洞试验计算结果吻合较好。由于我国规范未考虑重现期对线路影响，随线路安全等级提高，其等效静力风荷载可能会不安全。

Wind loads and wind-induced responses comparison of typical lattice structures based on various codes

The guidelines and procedures about wind load of transmission tower in IEC60826; BS EN 50341; ASCE No.74 and GB50545 are introduced and compared in detail. And taking a typical 500kV single-circuit transmission tower as an example, the difference of wind loads acting on the transmission tower based on various codes are compared with the results tested in the wind tunnel using high-frequency-force-balance technique. Then, the wind-induced responses of the typical transmission tower based on codes and wind tunnel test are computed and analyzed. The results show that the wind loads based on different codes for same transmission tower have some different under the same calculating conditions. With the increasing of section height of the transmission tower, the equivalent static wind loads (ESWLs) based on GB50545 are larger than other codes. The response of typical 500kV transmission tower based on wind tunnel test is similar to the codes. In addition, because GB50545 fails to consider the influence of different return periods, GB50545 could induce unsafe situation with the increased of security levels of transmission lines.