The buckling behaviour and resistances of press-braked stainless steel channel section beam-columns under combined compression and minor-axis bending have been studied in the present paper through laboratory testing and numerical modelling. The testing programme adopted two press-braked stainless steel channel sections and included initial global and local geometric imperfection measurements and ten beam-column tests. Two types of failure mode, namely ‘C’-orientation buckling (indicating that failure specimens buckled towards the web) and ‘reverse C’-orientation buckling (signifying that failure specimens buckled towards the flange tips), were observed upon testing. The testing programme was followed by a numerical modelling programme; finite element models were developed and validated against the test results and then adopted to perform parametric studies to generate further numerical data on press-braked stainless steel channel section beam-columns over a wide range of cross-section dimensions, member effective lengths and loading combinations. The obtained experimental and numerical data were employed to assess the accuracy and consistency of the relevant codified design rules for press-braked stainless steel channel section beam-columns, as given in the European code, American specification and Australian/New Zealand standard. The results of assessment revealed that the European code yields many unsafe resistance predictions for Class 1 and 2 press-braked stainless steel channel section beam-columns but overly conservative resistance predictions for Class 3 press-braked stainless steel channel section beam-columns, although the resulting overall design accuracy is good, but with a high level of scatter of the resistance predictions. Compared with the European code, the American specification and Australian/New Zealand standard result in slightly more accurate resistance predictions for press-braked stainless steel channel section beam-columns with buckling in the ‘C’ orientation, but lead to significantly more conservative predicted resistances for press-braked stainless steel channel section beam-columns with buckling in the ‘reverse C’ orientation. In terms of the design consistency, the American specification and Australian/New Zealand standard were shown to result in more consistent resistance predictions (regardless of cross-section dimensions and buckling orientations) than their Eurocode counterpart.

通过室内试验和数值模拟，研究了压弯不锈钢槽型梁组合柱在压缩和短轴弯曲作用下的屈曲行为和抗力。该测试程序采用了两个压制制动的不锈钢通道段，包括初始的整体和局部几何缺陷测量以及十个梁柱测试。在测试中观察到两种类型的破坏模式，即“ C”向屈曲（表示破坏的样本向腹板弯曲）和“反向C”向屈曲（表示破坏的样本向凸缘尖端弯曲）。测试程序之后是数值建模程序；开发了有限元模型，并针对测试结果进行了验证，然后将其用于进行参数研究，以生成关于压弯不锈钢通道截面梁柱的各种横截面尺寸，构件有效长度和载荷组合的进一步数值数据。根据欧洲规范，美国规范和澳大利亚/新西兰标准，使用获得的实验和数值数据来评估压弯不锈钢槽形截面梁柱相关规范化设计规则的准确性和一致性。评估结果表明，欧洲法规对1级和2级压弯不锈钢通道截面梁柱产生了许多不安全的阻力预测，但对3级压弯不锈钢通道截面梁柱却给出了过于保守的阻力预测，尽管最终的整体设计精度很好，但是电阻预测的分散程度很高。与欧洲规范相比，美国规范和澳大利亚/新西兰标准对带有“ C”字形屈曲的压弯不锈钢槽型梁柱的电阻预测值进行了更为精确的预测，但导致电阻值的预测更加保守适用于压弯的不锈钢通道截面梁柱，其屈曲方向为“反向C”。