Abstract
Cold-formed steel (CFS) is widely used as structural members in roof trusses, wall panels and claddings, storage racks and support structures. Nowadays, CFS is proposed to use as building components as beam and column etc. Owing to the very small thickness, the failure of the beam and column with perforation was mainly by excessive buckling and deformation. Thus, the behaviour of cold-formed steel hollow beam with web openings under flexural loading must be studied. In this study two different tubular cross section, shape and the position of the web openings were considered. The objective of the study is to examine the flexural strength, failure mode, load-deflection and load-strain behaviour of the cold-formed steel hollow beams with or without web openings under flexure. From the experimental study it was observed that square hollow beam fails by local and overall buckling whereas the rectangular hollow fails only by outward local buckling. The flexural strength of rectangular hollow beam was increased by 41% as compared to square hollow beam. The finite element model using ANSYS, was validated against the experimental results. A nonlinear finite element model shows good agreement with the experimental results.
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