Following the test program, the experimental results provided the details of the buckling behavior and failure modes and a set of load response curves.
The measurements of initial geometric imperfections and tensile coupon tests were conducted before compression tests. This paper presents a total of 44 new experimental results comprising 22 built-up sections with V-stiffeners and 22 with Σ-stiffeners of four different member lengths under the axial and eccentric compression loading to reveal the potential failures and load-carrying capacity of these built-up sections. While most of the studies focused on the built-up sections with plain channel sections (with or without lips), few studies have been reported for the built-up sections with channel sections with web stiffeners, particularly also considering the eccentric loading and web openings. To seek high load-carrying capacity members, built-up sections of Cold-formed steel (CFS) have been the popular choice.