In this paper, a series of axial compression tests were conducted on lipped channel columns constructed from cold-formed high strength Grade G550 steel sheet of thickness of 1 mm in order to investigate the local and distortional interaction buckling performance. The failure modes, ultimate loads and load–displacement curves of the specimens were reported and analyzed. The experiment revealed the deformation mechanism of specimens failing in local-distortional interaction or distortional mode. Besides, a finite element model was developed to predict the buckling performance of the specimens. The effect of different imperfection shapes and material models on numerical results was investigated so that the reasonable finite element analysis can be carried out. It was found that the local buckling mode with an odd number of waves as the initial imperfection can produce practical deformation process. Meanwhile, the material model of Ramberg–Osgood can be applied for the nonlinear finite element analysis of the specimens. The parametric analysis was also performed to study the relationship between the sensitivity of specimens to local and distortional imperfections as well as the variation of bearing capacity with the geometric size. It was found that the lip width has great influence on the bearing capacity of specimens because of the significant restriction of lip on distortional deformation.

为了研究局部和变形相互作用的屈曲性能，本文对由冷弯高强度G550级厚度为1mm的G550钢板制成的唇形通道柱进行了一系列轴向压缩试验。报告并分析了样品的破坏模式，极限载荷和载荷-位移曲线。实验揭示了试样在局部变形相互作用或变形模式下失效的变形机理。此外，建立了有限元模型来预测样品的屈曲性能。研究了不同缺陷形状和材料模型对数值结果的影响，从而可以进行合理的有限元分析。发现以奇数波作为初始缺陷的局部屈曲模式可以产生实际的变形过程。同时，Ramberg–Osgood的材料模型可以用于标本的非线性有限元分析。还进行了参数分析，以研究试样对局部和变形缺陷的敏感性以及承载能力随几何尺寸的变化之间的关系。发现由于唇部对变形变形的显着限制，唇部宽度对试样的承载能力有很大的影响。还进行了参数分析，以研究试样对局部和变形缺陷的敏感性以及承载能力随几何尺寸的变化之间的关系。发现由于唇部对变形变形的显着限制，唇部宽度对试样的承载能力有很大的影响。还进行了参数分析，以研究试样对局部和变形缺陷的敏感性以及承载能力随几何尺寸的变化之间的关系。发现由于唇部对变形变形的显着限制，唇部宽度对试样的承载能力有很大的影响。