特高压输电塔双角钢组合截面构件的承载力

电力事业迅猛发展,输电塔传统的单角钢构件已不能满足特高压、多回路、高荷载等要求,因此通过试验对特高压输电塔塔身主材规格为L160×12、L160×14、L160×16的3种双角钢组合十字形截面构件的极限承载力进行了研究,同时借助有限元方法分析了常用宽厚比下不同长细比、不同填板数量和布置位置等参数对构件承载力的影响,并进行了常用规范计算结果的对比。结果表明:其他规范和欧洲规范Eurocode 3对某些宽厚比试件是偏不安全的,美国ASCE10-97导则对该类试件均偏不安全,并提出计算长度修正公式;填板的最佳布置方式为均匀布置,存在最佳填板间距。

The research of bearing capacity for double-angle composited cross-section member of UHV transmission tower

With the rapid development of power industry in China,the traditional single angle steel members of the transmission tower cannot meet the requirements of high voltage, multi-loop, high-load and so on. By doing experiments with double-angle cruciform section, whose specification are L160×12,L160×14,L160×16, we analyze the ultimate bearing capacity of main components which constitute UHV transmission tower. Meanwhile, we use the FEM to deal with the influence of the parameters including different ratios of slenderness, different number and location of fill plate, etc. The calculation results are comperred with each other based on some general codes. The results show that, for some test pieces with certain ratios of width to thickness, other codes and Eurocode 3 code are not safe, but ASCE10-97 code is completely unsafety. So we propose the modifier formulas of calculated length. The best way of arranging plates is uniform layout and the best space between plates is existed.