A GBT formulation for 1st order elastoplastic analysis is presented and its application illustrated for a elastic-perfectly plastic simply supported I-setion beam subjected to point loads at mid-span. GBT results were validated against ABAQUS by means of shell finite element models. There is an excellent agreement in that comparison, particularlly regarding equilibrium paths and deformed configurations. With respect to stress diagrams, GBT results are very satisfactory for axial, shear and von Mises stresses, but distinct with respect to transverse normal stresses. However, the transverse normal stress 3D contours are qualitatively similar between GBT and ABAQUS in the whole beam domain.
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