摘要
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。
If the diameter-thickness ratio of steel tubes 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 steel 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 slenderness ratio and the weight bearing capacity are analyzed in detail.The limitation of diameter-thickness ratio for Q460 steel tubes is put forward,which could provide guidance for the current design of transmission line steel towers.
出处
《中国电力》
CSCD
北大核心
2012年第8期32-36,共5页
Electric Power
关键词
径厚比限值
Q460高强钢管
长细比
强度折减系数
失稳破坏
limitation of diameter-thick ratio
Q460 high-strength steel tube
slenderness ratio
strength reduction factor
instability failure
