Improvements in the design of special aluminium sections

The design process of special aluminium sections has been optimised by now obtaining the shear plastic areas, as well as the reductions which, because of the tangential stresses due to the torsional moment and shear forces, arise when subject to normal forces: axial force and bending moments. This way, in checks where in previous versions, an elastic analysis was used (in accordance with the plastification criteria exposed in EC9), now a plastic analysis is carried out and, therefore, improved usage factors are obtained.