Abstract
Background:In this work the behaviour of continuous steel-concrete composite beams with different shear connection distributions obtained from two design methods,i.e. Eurocode 4 and a proposed alternative approach, is analysed.Objective:For this purpose a finite element model specifically developed for the nonlinear analysis of steel-concrete composite beams is adopted. This finite element model includes material nonlinearity of slab concrete, reinforcement steel, beam steel as well as slab-beam nonlinear partial interaction due to the deformable shear connection. The inclusion of the partial interaction in the composite beam model provides information on the slab-beam interface slip and shear force and enables to model the failure of the shear connectors.Results and Conclusion:In this way it is possible to analyse and quantify the effect of shear connector distributions on the global and local response of continuous steel-concrete composite beams, both under service load levels and at collapse. Particular attention is focused on the ductility requirements on the shear connectors when varying the connection design approach and distribution.
Highlights
Composite beams made by a steel beam connected to a reinforced concrete (RC) slab are widely adopted as a structural solution for building floors and bridge decks, owing to the many advantages arising from combining RC and steel, [1, 2]
Particular attention is focused on the ductility requirements on the shear connectors when varying the connection design approach and distribution
In this study the behaviour of continuous steel-concrete composite beams with different shear connection distributions was analysed by mean of a specific composite beam model with partial interaction and including the nonlinear behaviour of materials and shear connection. In this way this research aims at providing a contribution to identify the relation between shear connection design and the structural behaviour of the designed continuous composite beams, a structural problem where very few information is available in the technical literature
Summary
Composite beams made by a steel beam connected to a reinforced concrete (RC) slab are widely adopted as a structural solution for building floors and bridge decks, owing to the many advantages arising from combining RC and steel, [1, 2]. Some other structural features deserve more attention since reduced information is available Among the latter is the evaluation of the effects of different distributions of shear connectors on the global and local response of composite beams. The design should include the evaluation of the required strength of the shear connection and its slip capacity compared to the slip demand at the ultimate limit state, [3 - 5]. At this regard, some recent results are available for supported composite beams [6] while no studies for continuous beams can be found in the technical literature. In this work the behaviour of continuous steel-concrete composite beams with different shear connection distributions obtained from two design methods, i.e. Eurocode 4 and a proposed alternative approach, is analysed
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