A Review and Development of Cold-formed Steel Channel Columns with Oriented Strand Board Sections

Abstract Cold-formed steel (CFS) is a steel-based material that is always used as a structural or non-structural component in construction activities. In Malaysia, CFS is broadly utilised in roof truss systems to replace timber and hot-rolled steel in residential houses and small industrial buildings. Some of the advantages of CFS include being lightweight, recyclable, and durable and having highest strength-to-weight ratio. It is also becoming excessively popular as a building material. However, CFS with its thin surface tends to fail in buckling on short and slender sections either at the compression or flexural members especially for the web element. In this study, the CFS channel section with 100 mm of the web, 50 mm of flange, 12 mm of lip, 1.55 mm of thickness and without any web stiffener has been selected. With the intention of solving the buckling failure, CFS has been formed as a symmetrical and closed section and filled with oriented strand board (OSB) at the gap of each section. The main objective of this study was to review the previous study of CFS with other materials to produce the composite material and introduce the development and preliminary study of the new section. The CFS with OSB was proposed as a solid symmetrical section to solve the local, distortional, and global buckling, as well as establish a stable and stiffened section under compressed conditions. Therefore, the local and distortional buckling of the compressed member was completely solved by the built-up and box-up of CFS with the OSB section however the CFS channel section with OSB managed to minimise the effect of local and distortional buckling. There was a 9.20%, 5.16% and 5.84% percentage difference of the ultimate load between the CFS without and with OSB sections. The new section reduced the production cost, while also reducing the material usage. It also has the potential to be an innovative section by supporting the Malaysian sustainable development programme.