Abstract More people are living near the polar regions due to the availability of land and emerging job opportunities in these regions. This has led to increased construction activities in these sub-zero temperature regions for which a suitable cost-effective construction material is needed. Although cold-formed steel (CFS) consists of many good features that are required for cold region construction, the knowledge of the structural behaviour and capacity of CFS members at sub-zero temperatures is limited. In this research, low and high strength CFS lipped channel columns subject to local buckling and yielding failures were tested in the temperature range of +20 to −70 °C to understand their behaviour and determine their sub-zero temperature compression capacities. Tests showed that there were no premature failures caused by brittle fracture, even after significant localised deformations during the post-ultimate phase. In all cases the ultimate capacity increased considerably even at temperatures below −50 °C, especially for low strength steel columns. Finite element models were also developed to simulate the local buckling and yielding failures of tested columns, and the models were validated using the test results. The ambient temperature design methods given in the cold-formed steel standards such as AS/NZS 4600 were shown to be adequate to determine the sub-zero temperature compression capacities of CFS columns when sub-zero temperature mechanical properties are used instead of ambient temperature mechanical properties.

中文翻译：

---

冷弯型钢受压构件在零以下温度下的行为

摘要 由于这些地区的土地供应和新兴就业机会，越来越多的人居住在极地地区附近。这导致在这些零下温度区域的建筑活动增加，需要合适的具有成本效益的建筑材料。尽管冷弯型钢 (CFS) 具有寒冷地区施工所需的许多优良特性，但对 CFS 构件在零以下温度下的结构行为和能力的了解是有限的。在这项研究中，在 +20 至 -70 °C 的温度范围内测试了受局部屈曲和屈服破坏的低强度和高强度 CFS 唇形通道柱，以了解它们的行为并确定它们的零以下温度压缩能力。试验表明，没有由脆性断裂引起的过早失效，即使在最终阶段发生显着的局部变形之后。在所有情况下，即使在低于 -50 °C 的温度下，极限容量也显着增加，尤其是对于低强度钢柱。还开发了有限元模型来模拟测试柱的局部屈曲和屈服失效，并使用测试结果验证模型。冷弯型钢标准（如 AS/NZS 4600）中给出的环境温度设计方法表明，当使用零下温度机械性能而不是环境温度机械性能时，足以确定 CFS 柱的零下温度压缩能力特性。特别适用于低强度钢柱。还开发了有限元模型来模拟测试柱的局部屈曲和屈服失效，并使用测试结果验证模型。冷弯型钢标准（如 AS/NZS 4600）中给出的环境温度设计方法表明，当使用零下温度机械性能而不是环境温度机械性能时，足以确定 CFS 柱的零下温度压缩能力特性。特别适用于低强度钢柱。还开发了有限元模型来模拟测试柱的局部屈曲和屈服失效，并使用测试结果验证模型。冷弯型钢标准（如 AS/NZS 4600）中给出的环境温度设计方法表明，当使用零下温度机械性能而不是环境温度机械性能时，足以确定 CFS 柱的零下温度压缩能力特性。