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已有研究成果表明,开孔冷弯薄壁卷边槽钢柱在压力作用下会发生一种特殊的局部屈曲——孔洞附近的未加劲条屈曲,而未加劲条弹性屈曲应力计算方法的确定是将直接强度法承载力公式用于开孔冷弯薄壁卷边槽钢柱设计时亟待解决的关键问题。基于以往开孔板件未加劲条屈曲的研究成果,对开孔冷弯薄壁卷边槽钢柱提出了考虑板件相关作用的未加劲条屈曲应力计算公式,并将此公式的计算结果与有限元特征值屈曲分析值进行了对比研究。结果表明,两者吻合较好,此公式可以应用于开孔冷弯薄壁卷边槽钢柱弹性局部屈曲应力的计算。
The research results show that a special local buckling occurs in the cold-formed thin-walled curling channel steel columns under pressure and the unstiffened buckling near the holes occurs, while the calculation method of the elastic buckling stress in the unstressed strip is determined Is a key problem to be solved urgently when using the formula of bearing capacity of direct strength method in the design of steel columns of cold-formed thin-walled curling channel with openings. Based on the research results of unbonded buckling of perforated slab in the past, the formula for calculating buckling stress of stiffened slab with cold-formed thin-walled curling channel is proposed, and the calculation result of this formula is compared with Finite element eigenvalue buckling analysis values were compared. The results show that the two agree well with each other, and this formula can be applied to calculate the local elastic buckling stress of the cold-formed thin-walled curling channel with open-hole.