本文开发了一种统一的方法来评估偏心载荷下奥氏体和铁素体不锈钢圆形空心截面（CHS）梁柱的结构性能。这种方法基于将变形方法和倒塌理论相结合的方法，用于不锈钢CHS梁柱。规范化的M – N –Φ基于纤维模型推导了不锈钢CHS的关系。该方法结合了基于连续强度法（CSM）的变形能力和应变硬化。本文的新颖之处在于，通过结合归一化的M – N –Φ方程与一般的梁柱方程。此外，确定了临界归一化的中间高度曲率，该曲率可用于区分组合载荷作用下不锈钢CHS梁柱的截面局部屈曲破坏与整体稳定性破坏。所提出的方法通过为不锈钢CHS梁柱引入新的无尺寸细长比，将梁柱的强度与有效柱长相关联。它还提供了一种明确的方法来考虑柱缺陷对不锈钢CHS梁柱强度的影响。通过针对两种不锈钢等级的各种无维细长比和不同类别的CHS横截面，将预测值与测试结果和数值结果进行比较，评估得出的归一化相互作用曲线的准确性。在预测两种类型钢种的短和长不锈钢CHS梁柱的强度时，都达到了很高的准确性和一致性。

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This paper develops a unified approach for assessing structural behaviour of austenitic and ferritic stainless steel circular hollow section (CHS) beam–columns​ under eccentric loading. This approach is based on combining a deformation-based method and collapse theory for stainless steel CHS beam–columns.A normalised M–N–Φ relationship of stainless steel CHS was derived based on a fibre model; the approach incorporated deformation capacity and strain hardening based on continuous strength method (CSM). The novelty of this paper is to present a closed-form solution for generating axial-load–end-moment interaction curves of the stainless steel CHS beam–column by combining the normalised M–N–Φ equation with a general beam–column equation. Besides, a critical normalised mid-height curvature was determined, which could be used to differentiate cross-section local buckling failure from global stability failure of stainless steel CHS beam–columns under combined loading. The proposed approach related the strengths of beam–columns to the effective column lengths by introducing a new non-dimensional slenderness ratio for stainless steel CHS beam–columns. It also provided an explicit way to consider the effect of column imperfections on the strengths of stainless steel CHS beam–columns. Accuracy of the derived normalised interaction curves was assessed by comparing the predictions against the test and numerical results for a wide range of non-dimensional slenderness ratios and different classes of CHS cross-sections for both stainless steel grades. A high level of accuracy and consistency was achieved in predicting the strengths of both short and long stainless steel CHS beam–columns for both types of steel grade.