Recent Developments in the Mechanical Properties of Perforated Cold-Formed Thin-Walled Steel Members

This paper systematically reviews the current research status and development trends of perforated cold-formed thin-walled steel (CFTS) members, including both compression and flexural members. Since the late 19th century, researchers have used experimental testing, theoretical analysis, and finite element simulation to explore the effects of perforations on the load-carrying capacity, buckling stress, and mode of buckling of members, providing theoretical support and practical guidance for engineering design. It has been found that most existing studies have focused on columns and web perforations, while research on beams and flange perforations is relatively limited, indicating potential directions for future research. Although theoretical analysis has its value, experimental testing and finite element analysis have gradually become dominant due to their efficiency in handling complex conditions. Future research should focus on new buckling modes and performance changes caused by perforations in composite sections, as well as the mechanical behavior of complex section forms after perforation. The direct strength method (DSM) is not sufficiently accurate in predicting the load-carrying capacity of perforated members and exhibits significant variability. The application of machine learning algorithms is expected to offer new perspectives and methods for mechanical performance analysis. The research findings of this paper can lay a solid foundation and provide direction for future research on perforated CFTS members.