单角钢压杆的屈曲及稳定计算

The buckling and stability calculation of single angle compression members

在钢结构工程中经常采用等边或不等边单角钢作为轴心受压构件,现行钢结构设计规范(GB50017—2002)提供了等边单角钢压杆的截面类别及稳定计算方法,但对不等边单角钢压杆的规定相对粗糙。本文根据弹性稳定理论和角钢截面特征规律,推导了等边及不等边单角钢轴心受压构件的屈曲条件和长细比简化计算方法,并给出了稳定设计方法。扭转屈曲换算长细比仅与角钢肢宽与肢厚的比值有关,这使得弯扭屈曲换算长细比的计算也进一步简化。经过验证,该方法简单实用,可供工程设计参考。

Single equal and unequal leg angles are usually used as axial compression members in steel structures. Current design code for steel structure (GB 50017—2002) presents the section types and stability calculation methods for compression members with the section of single equal leg angles, but the methods for unequal leg angles are relatively rough. Based on the elastic stability theory and rule of section properties of angles, buckling conditions and calculation method of slenderness ratio were deduced for single angle axial compression members, and the stability design methods were also presented. Equivalent slenderness ratio of torsional buckling just depends on the ratio of width to thickness of leg, and this simplifies the calculation method of equivalent slenderness ratio of torsional flexural buckling. These methods are simple and practical, and can be used as a reference for relative engineering design.