Cold-formed steels are replacing conventional building materials in many building applications due to the many benefits including lightweight and low cost of construction. Recent research has focused on the fire resistance of cold-formed steel (CFS) construction at material and member levels and advanced the knowledge of their fire performance significantly. However, the performance of CFS members at sub-zero temperatures has not been investigated. Although several studies have been conducted on the mechanical properties of other types of steel at sub-zero temperatures, no studies have been conducted on sub-zero temperature mechanical properties of thin cold-formed steels. In this research, low and high strength cold-rolled steel sheets were tested in the temperature range of 20 to −70 °C to determine their sub-zero temperature mechanical properties. Predictive equations are proposed for yield strength, Young's modulus, upper yield strength, ultimate strength and stress at 2% total strain using the experimental results. Finally, suitable stress-strain models are recommended for the prediction of sub-zero temperature stress-strain curves and their use in numerical studies.

由于具有许多优点，包括轻质和低成本，冷弯型钢正在许多建筑应用中替代常规建筑材料。最近的研究集中在材料和构件级别的冷弯型钢（CFS）结构的耐火性上，并大大提高了其耐火性能的知识。但是，尚未研究CFS成员在零以下温度下的性能。尽管已对零度以下温度下其他类型钢的机械性能进行了多项研究，但尚未对薄冷弯型钢的零度温度以下机械性能进行过研究。在这项研究中 在20至-70°C的温度范围内测试了低强度和高强度冷轧钢板，以确定其低于零温度的机械性能。利用实验结果，提出了总应变为2％时的屈服强度，杨氏模量，上屈服强度，极限强度和应力的预测方程。最后，推荐合适的应力-应变模型来预测低于零温度的应力-应变曲线并将其用于数值研究。