Built-up columns comprising H-SA700 steel is proposed for use in all-bolted, seismically resilient building structures. The columns are formed by combining two plates acting as flanges and two cold-formed channels acting as dual web by F14T bolts. Laboratory experiments were conducted to examine the flexural properties of these columns. The results suggest that the flexural strength is dictated either by fracture of the perforated section, buckling of the flange plate, or inelastic out-of-plane distortion. The perforation due to bolt holes does not affect the elastic stiffness. Advantages offered by the built-up columns include a large elastic drift limit of 0.02 rad, the flexural strength twice as large, and reduction in the cross-sectional area.
