Affidabilità di analisi agli elementi finiti per lo studio del collasso di travi composte continue

The study of the carrying load capacity of steel-concrete composite beams requires some attention, due to the non-linear interactions between the concrete slab, steel beam and shear connectors. A beam model, accounting for the weak shear interface, permits an accurate description of the global behaviour, when an appropriate solution technique is adopted. The finite element method can be used with good results; many problems occur however if an unsuitable beam element and an inadequate mesh are used. The authors illustrate displacement-based and three-field mixed finite elements proposed in previous works. The elements are evaluated by comparison with experimental tests on continuous beams.