(华东电力设计院有限公司， 上海 200001)

［摘要］梳理和总结了输电线路超高度大跨越铁塔选型时，所需考虑的风荷载影响、设计方法、材料选择、加工和施工等多面的因素。指出超高度大跨越铁塔结构应优先采用高强度钢管，并控制管径和钢管厚度，合理设计高强度螺栓，必要时对高强度螺栓采购作严格技术要求。同时论述了在设计中应确保其计算模型和实际受力情况的一致性，重点关注横风向激振、构件局部屈曲和塔架整体稳定问题。最后提出超高度大跨越铁塔应坚持化整为零的设计理念，尽量减小构件规格和尺寸、降低构件单件重量，便于材料采购、铁塔加工及现场运输和组装；尽量采用单一钢结构型式以减少施工工序，从而提高铁塔加工质量、降低高空组装难度和安全风险。

［关键词］结构选型； 超高度大跨越铁塔； 多因素探讨

中图分类号：TU279-7+44文献标识码：A文章编号：1002-848X(2016)14-0036-06

Multi-factor discussion on structural system selection of super-high large-span steel tower structure for transmission line

Dong Jianyao

(East China Electric Power Design Institute Co.,  Ltd.,  Shanghai 200001， China)

Abstract: Multiple factors that should be considered in structural system selection of super-high large-span steel tower structure for transmission line were collated and summarized, including the wind load effect, design method, materials selection, processing and construction. High-strength steel pipe was preferred in super-high large-span steel tower structure. And pipe diameter and thickness should be controlled and high strength bolts should be rationally designed. Stringent technical requirements should be carried out on the procurement of high-strength bolts if necessary. At the same time, consistency in the calculation model and the actual mechanical situation in the design should be ensured, and problems were focused on including cross-wind direction excitation, member′s local buckling and overall stability of the tower frame. Finally, it proposed decentralized design concept in super-high large-span steel tower structure should be adhered to, to minimize component specifications and dimensions and reduce the weight of a single piece of component, in order to make it easy for materials procurement, processing of the steel tower and in-situ transportation and assembly. Single type of steel structures should be used as far as possible to reduce construction procedures, improve the machining quality of the tower and reduce the high-level assembly difficulty and safety risk.

Keywords:structural system selection; super-high large-span steel tower structure; multi-factor discussion

作者简介：董建尧，学士，高级工程师，Email：djy@ecepdi.com。