Steel Building Design_Design Data Effective properties have been given for RHS subject to minor axis bending. For RHS subject to bending, the second moment of area presented is always the gross property. For RHS subject to axial load and bending, the choice of curve for lateral torsional buckling (for lengths greater than the limiting length) reflects the provisions of the UK National Annex. For circular hollow sections subject to axial load and bending, the reduced moment resistance reflects the provisions of the corrigenda to BS EN 1993-1-1.