Influence of steel fibres on the behaviour of L-shaped high strength reinforced concrete and concrete-encased composite columns is presented. A total of 16 L-shaped plain and steel fibre columns were constructed and tested in this study. The main parameters were the concrete compressive strength, load eccentricity, slenderness effect and steel fibre content. The experimental results of L-shaped reinforced concrete and composite column specimens were discussed in the paper. In addition, the column specimens were analysed based on a theoretical method considering the nonlinear behaviour of the materials. The slenderness effect of the columns has been taken into account by using The Moment Magnification Method suggested by ACI 318 specification. The results show that the inclusion of steel fibres into high strength concrete has considerable effect on structural behaviour of L-shaped both reinforced concrete and composite columns subjected to biaxial bending and axial load. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.