This paper aims to study the structural performance and design of cold-formed steel elliptical hollow sections under combined compression and minor axis bending. An accurate finite element model was developed and validated against the available test results. The validated model was further used to carry out an extensive parametric study on 560 beam-columns, including fifty-six cross-section series with two different specimen lengths loaded at five different eccentricities, and 112 concentric loaded column counterparts. A broad range of cross-section geometries and a spectrum of member slenderness and loading eccentricities were designed for the parametric study. A total of 602 beam-column results, including 42 available test data and 560 numerical results in this study was compared with the predictions by the existing design methods, such as the equivalent diameter method and the equivalent rectangular hollow section approach with the European Code as well as the existing traditional design rules (Australian Standard, North American and American Specifications) using equivalent diameter. Reliability analysis was also carried out. It is shown that the existing design methods provide quite conservative and scattered design strength predictions. In this study, modifications are proposed on the Australian Standard, North American and American Specifications, which are proven to provide accurate and reliable design predictions. Among the three modified design methods, it is recommended to use the modified ANSI/AISC360 method for the design of cold-formed steel elliptical hollow sections under combined compression and minor axis bending as it provides the most accurate predictions in this study.

本文旨在研究组合压缩和短轴弯曲条件下冷弯型钢椭圆形空心截面的结构性能和设计。开发了一个精确的有限元模型，并根据可用的测试结果进行了验证。经过验证的模型还用于对560个梁柱进行广泛的参数研究，包括五十六个横截面系列，其中两个不同的标本长度以五个不同的偏心率加载，以及112个同心加载的列对应物。为进行参数化研究，设计了各种横截面几何形状以及一系列的成员细长度和加载偏心率。总共602个梁柱结果，包括42个可用的测试数据和560个数值结果，与现有设计方法的预测结果进行了比较，例如采用欧洲规范的等效直径法和等效矩形空心截面法，以及使用等效直径的现有传统设计规则（澳大利亚标准，北美和美国规范）。还进行了可靠性分析。结果表明，现有的设计方法提供了相当保守和分散的设计强度预测。在这项研究中，对澳大利亚标准，北美和美国规范提出了修改建议，这些修改被证明可以提供准确和可靠的设计预测。在三种修改的设计方法中，