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Received: 28 November 2006; Revised: 4 May 2007; Accepted: 9 July 2007 ABSTRACT: Compression tests were carried out on cold-formed steel single angles, double angles welded back-to-back and starred angles under three different end connections. Eight plain sections of different sizes of two different thicknesses of different strengths were tested as stub and as short columns. The effect of flat width to thickness ratio, the effect of size of the section, the effect of material yield strength and the effect of symmetricity of the cross-section on the load carrying capacity is studied. Load versus axial shortening behaviour, load versus lateral deflection behaviour and load versus strain behaviour is also studied. The initial stiffness and ductility co-efficient for different sections are computed and compared. The ultimate loads of double angles welded back-to-back and starred angles with ball end connection is found to be more than twice when compared to single angles irrespective of the slenderness ratio. It was found that initial stiffness of double angles welded back-to-back is 1.25 times more than that of single angles. There was reversal of strain from compression to tension for compound angles beyond 70% of ultimate load. The effect of symmetricity on the mode of buckling of the specimens under different slenderness ratios is also reported.

BEHAVIOUR OF COLD-FORMED STEEL SINGLE AND COMPOUND PLAIN ANGLES IN COMPRESSION