Structural behaviour of octagonal tubular steel stub columns under uniaxial compression

Abstract

This paper presents the experimental and numerical investigations on the compressive behaviour of cold-formed steel tubular stub columns with octagonal cross-section. Companion stub columns with circular and square cross-sections were also examined and compared. The material properties, dimensions and geometric imperfections for each specimen were carefully measured. Load-deformation relationships and failure modes of the test specimens were presented. Finite element methodology was also developed and validated against the experimental results. The current design codes from Europe and North America were assessed.