冷弯薄壁卷边槽钢柱弹性畸变屈曲数值分析

随着高强冷弯薄壁型钢在建筑业中的大规模应用，使得构件畸变屈曲的出现可能先于板件的局部屈曲，成为构件失效控制模式。畸变屈曲的破坏机理不同于局部屈曲，其弹性屈曲应力计算过程也大相径庭。现有畸变屈曲临界应力的计算公式异常复杂，在设计中可以借助数值分析的方法进行计算。有限条方法和有限元方法是常用的两种数值分析方法，采用有限条方法和有限元方法计算了冷弯薄壁型钢柱构件弹性畸变屈曲应力和屈曲半波长度，对比研究发现二者结果非常接近，均可用于分析柱试件的弹性畸变屈曲。

Numerical analysis of elastic distortional buckling for cold-formed thin-walled steel lipped channel columns

The distortional buckling which becomes a significant failure mode probably appears prior to the plates local buckling when high-strength steel with thinner cross-sections are widely used in building. The failure mechanism of distortional buckling is different from the local buckling, and the computing process of those elastic buckling stress are quite distinct. The present procedures for the calculation of critical elastic distortional buckling stress are very complicated and cumbersome, and the estimation of the buckling stress in design is depended on the numerical analysis method which the finite strip method and finite element method are usually used. A comparison of the results of elastic distortional buckling stress and half wavelength got by finite strip method and finite element method were conducted, it was found that the values were very close to each other. Two methods can be used for predicting the elastic distortional buckling of cold-formed thin-walled steel columns.