If the diameter-thickness ratio of steel lubes exceeds a certain limit, local buckling will occur before overall buckling in steel components under pressure, which makes the steel components loose the whole-area weight bearing capability and accelerates the overall instability process. The application of sled tubes with large diameter-thickness ratio in transmission lines is mainly limited by the diameter-thickness ratio. By comparison between domestic and international standards, compression tests on 18 sets of steel axial components and theoretical analysis, the internal relationships between the diameter-thickness ratio, the slendemess ratio and the weight bearing capacity are analyzed in detail. The limitation of diameter-thickness ratio for Q460 steel lubes is put forward, which could provide guidance fur the current design of transmission line steel lowers.%当钢管的径厚比超过一定限值时,钢管构件受压时局部屈曲先于整体稳定破坏,使构件不能全面积承载,从而会加速构件整体失稳而丧失承载能力.输电线路中对于大径厚比钢管使用的限制主要以径厚比限值来实现.通过国内外规范对比、18组钢管构件轴心受压试验和理论分析相结合的方法,研究分析了Q460钢管径厚比及其长细比与钢管承载力的内在关系,并得到Q460钢管径厚比限值,该限值的试验验证对目前输电线路钢管塔设计具有指导意义.
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