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Effective failure modes relating to the steel cellular beams that nowadays have become widely used as a part of a building load-bearing structure are identified and discussed in detail. They are presented as those being critical both due to the structural resistance evaluation and due to the stability assessment. In the first case, the ultimate bending moment resistance of a whole beam in the presence of shear is estimated as well as the resistance of the beam tee section located at mid-length of the web-opening. Regarding to the verification of beam stability not only the lateral-torsional buckling is taken into consideration but also the shear buckling of the beam web and even the local instability of a web-post. Finally, the risk of the rupture of a welded joint located in a beam web-post is assessed to check if it is so small that it can be accepted by the building user.

FAILURE MODES DETERMINING THE RESISTANCE AND THE STABILITY OF STEEL CELLULAR BEAMS