Abstract
This paper reports a series of flexural tests at ambient temperature focused on cold-formed steel beams composed especially by two or more CFS profiles which are often used in floors and roofs of warehouses and industrial buildings. The main objective of this research was to assess the failure loads and modes of the studied beams and also to compare the structural response of these different kinds of beams. Finally, the results showed above all that the failure loads of the open cross-section beams corresponded to the lateral-torsional buckling modes, whereas the distortional buckling was the responsible buckling mode for the failure loads of the hollow cross-section beams.
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