Assessment of Connection Arrangement of Built-Up Cold-Formed Steel Section under Axial Compression

Abstract

Cold-formed steel (CFS) with several of the advantages is selected in construction activity as structural and non-structural element. CFS with variety of shape, dimension and grade is chosen to replace traditional material that largely used before. In the study, CFS is utilised as a compression member to support beams element in the building. The column made with CFS is important to sustain the load and build the stable equilibrium circumstances. The column stability is the big issue that must be discussed and determined to prevent the buckling load, unmanageable deflection and lastly building collapse. So that, the study of structural properties and column capacity under compression load of the column is being investigated. Compression test of built up CFS channel that is attached at open side facing by using bolting through the web of the channel. A tensile coupon specimen of channel is taken at the flange and web of CFS channel to find the actual material properties the results that the CFS behave similar to a carbon steel with yield stress 500 MPa. Five arrangement of bolt that are margin of its mid height, compressed using a servo machine to get the axial capacity of the column. Under constant length of 900 mm and constant material, the end distance of bolt to the tip of the column are greatly affecting the column capacity by strengthening its bearing capacity. Hence, it is recommended that, the end distance of bolt must be placed at 20 mm to improve the bearing strength of the column, and the spacing of columns can be restudy for better results.