The elastic distortional buckling stress and stability coefficient of cold-formed steel lipped channel bending members are developed based on energy method. The comparison on calculated results of the elastic distortional buckling stress using developed method and finite strip method shows that the developed method has high precision. A uniform formula for distortional buckling stability and local buckling factor are introduced. The calculated method for global stability capacity of bending members is proposed based on the uniform formula. The developed uniform formula has higher precision to calculate the stability coefficient of partially stiffened elements and ultimate load-carrying capacity of cold-formed thin-walled steel lipped channel bending members than GB 50018—2002 Technical code of cold-formed thin-walled steel structures according calculating ultimate strength of the test specimens.%采用能量法分析冷弯薄壁型钢卷边槽形开口截面受弯构件弹性畸变屈曲应力及其畸变屈曲稳定系数.通过与有限条法分析的畸变屈曲应力进行对比分析,表明建议的畸变屈曲应力计算公式具有较高的精度,通过简化计算得到畸变屈曲稳定系数计算公式及部分加劲板件的局部畸变屈曲统一计算公式;给出了卷边槽形截面受弯构件考虑畸变屈曲的稳定承载力计算方法.最后通过分析计算受弯构件试验的构件承载力并与试验结果进行对比,表明本文提出的计算方法是合理的,相对于现行GB 50018—2002《冷弯薄壁型钢结构技术规范》能更准确地计算受弯构件部分加劲板件屈曲稳定系数及卷边槽形截面构件的稳定承载力.
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