（浙江大学建筑设计研究院， 杭州 310028）

［摘要］弹性屈曲荷载并不能直接看作是承载力，实际压杆存在初始弯曲，在弹塑性阶段失稳,需要改用极限承载力理论来确定压杆的稳定承载力。通过欧拉公式提供中间参数得到换算长细比的计算稳定系数，从而得到构件的承载能力。因此《钢结构设计规范》采用换算长细比来查稳定系数φ，计算构件的极限承载力。然而规范给出的换算长细比公式缺乏一致性，是一个分段函数。由压杆弯曲失稳和扭转失稳互相作用得到启发，提出双角钢组合T形截面和等边单角钢绕对称轴弯扭失稳换算长细比的一致性公式。

［关键词］压杆； 角钢； 弯扭屈曲； 稳定； 换算长细比

中图分类号：TU323      文献标识码：A      文章编号：1002-848X(2013)15-0127-04

 

Ni Wenhao, Wang Jun

 (Archtectural Design and Research Institute of Zhejiang University, Hangzhou 310028, China)

 

Abstract: The elastic buckling load can not be directly seen as bearing capacity. Actually the component exist initial bending, the limit supporting capacity theory is needed to determine the stable bearing capacity of component in the elastic-plastic phase. The Euler’s formula provides the slenderness ratio calculates. Through equivalent slenderness ratio to calculate the stability coefficient, it can obtain the bearing capacity of the component. So Code for design of steel structures adopts equivalent slenderness ratio to search stability coefficient. However, the equivalent slenderness ratio given by GB 50017—2003 is lack of consistency, and is a sub-part function. Inspired by the interacting of flexural and torsional buckling, it presents consistent equivalent slenderness ratio formula of struts of monosymmetric section T shape section built with the double angle steel and an equal sides angle steel buckling around axis of symmetry.

Keywords: strut; angle steel; flexural-torsional buckling; stability; equivalent slenderness ratio

作者简介：倪闻昊，硕士，助理工程师，Email:niwenhaohotmail@163.com。

 

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