3D non-linear numerical model, developed to predict the mechanical behaviour of simply supported steel-concrete composite beams under three-point bending stress

This paper presents a 3D non-linear numerical model, developed to predict the mechanical behaviour of simply supported steel-concrete composite beams under three-point bending stress. Using on Abaqus software a 3D model is created, which takes into account all the elements of the steel-concrete composite beam. The concrete slab, steel beam, and studs are modeled using solid elements, reinforcing bars are neglected. The geometrical and mechanical characteristics are based on beams tested in previous studies. The non-linear behaviour of steel-concrete materials is considered and the interaction between the different surfaces is taken into account. The deflection and slip results at the interface of slab and steel sections showed good agreement with experimental and analytical results. The maximum load value is close to that obtained by a plastic analysis of the composite section according to the Eurocode (1994) rules, with a relative deviation of 10%. Furthermore, the behaviour of increasing the reinforcing plate thickness on the composite beam gives an increase in maximum load and a decrease in the slip at the steel-concrete interface.