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钢管塔在我国特高压输电线路中得到广泛应用.为保证结构安全、经济,需要合理选择钢管构件的长细比.以1 000 kV淮南-上海(皖电东送)同塔双回线路钢管塔为研究对象,通过典型塔型的有限元设计校核,分析了塔身主材杆端弯矩对其承载力的影响,提出了主材长细比不大于35的取值及校核建议.对于特高压钢管塔的水平材和一些斜材及辅助材,基于不同长细比钢管构件的微风振动特性和对现行设计规程的分析,从同时控制振动和降低塔重的角度提出了构件长细比不大于160的取值要求.
The steel tube tower is widely used in China’s UHV transmission lines.In order to ensure structural safety and economy, it is necessary to select the slenderness ratio of the steel tube components reasonably.With 1 000 kV Huainan-Shanghai (Anhui East) dual-return line steel tower As the research object, through the finite element design verification of typical tower type, the influence of the bending moment of the tower main pole rod end on its bearing capacity was analyzed. The value of main slenderness ratio not more than 35 and the checking suggestion were put forward. Based on the breeze vibration characteristics of different slenderness ratio steel pipe members and the analysis of the existing design rules, the horizontal length, the inclined material and the auxiliary material of the UHV steel tube tower are analyzed. From the point of view of controlling the vibration and reducing the tower weight at the same time, Than the value of not more than 160 requirements.