The formulation and implementation of beam-column finite elements for the general thin-walled open cross-sections within the OpenSees framework is presented. To account for the non-coincident location of shear centre and centroid as is the case in non-symmetric sections, a local cross-section transformation matrix is derived relating the axial force acting through the centroid and the shear centre. The stiffness relations are derived based on the Green-Lagrange strain for the displacement-based beam-column element while the Wagner effect is incorporated in the torsional rigidity term for the elastic beam-column element. The beam-column elements are then implemented within the co-rotational framework of OpenSees. The performance of developed beam-column elements are demonstrated through the use of monosymmetric, doubly-symmetric and asymmetric sections in a series of numerical examples. The solutions obtained are verified with the results from the beam and shell element models in ABAQUS software. University of Sydney Research Report R961, Feb 2016. Authors Rinchen, Hancock, G.J. and Rasmussen, K.M.R.