单角钢压杆的肢件宽厚比限值和超限杆的承载力  

Limiting width-thickness ratio and strength of beyond-limit members for single angle struts

作　　者：陈绍蕃[1] 王先铁[1] 

机构地区：[1]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《建筑结构学报》2010年第9期70-77,共8页Journal of Building Structures

摘　　要：在采用低碳素结构钢制作单角钢压杆时,肢件宽厚比限值不是需要关心的问题。现在高强度的Q420钢和Q460钢开始在输电塔架中应用,设计工作者不仅要关心宽厚比限值,还要了解超限杆的承载力应如何计算。单角钢压杆的受力情况分为轴压和偏压两类,它们对肢件宽厚比有不同的要求,但现有塔架设计的技术规定并未对此做出区分。根据理论分析和现有文献的试验结果,发现宽厚比限值对轴压单角钢和偏压单角钢有不同意义,分别是防止局部屈曲和防止整体失稳时抗扭性能过低。据此,分别提出两类杆件宽厚比限值和超限杆承载力的计算公式,计算了两批Q460单角钢压杆的承载力,与对应文献试验值符合较好。In the days structural carbon steel is widely used for single angle strut,the issue of limiting width-thickness ratio is not a major one.Nowadays,high strength steels Q420 and Q460 begin to be used in transmission towers,not only limiting width-thickness ratio,but also strength of beyond-limit members,are to be of concern to designers.Single angle struts are divided into two categories according to the force application,namely axial compression and eccentric compression.Their demand of width-thickness ratio is not the same,but current technical provisions do not distinguish the two cases.Based on theoretical analysis and experimental observation,this article reveald the different meanings of limiting width-thickness ratio to axially and eccentrically compressed angle struts： to prevent local buckling and to avoid excessively low resistance to twisting.Hence,two types of limiting width-thickness ratio and formula for beyond-limit strength calculation were suggested.These formulas correlate well with test results of two sets of Q460 single angle strut specimens.

关 键 词：单角钢压杆 宽厚比限值 超限杆 局部屈曲 弯扭屈曲 

分 类 号：TU392.1[建筑科学—结构工程]