8An innovative steel-timber composite floor for use in multi-storey residential buildings is presented. The research 9 demonstrates the potential of these steel-timber composite systems in terms of bearing capacity, stiffness and method of 10 construction. Such engineered solutions should prove to be sustainable since they combine recyclable materials in the 11 most effective way. The floors consist of prefabricated ultralight modular components, with a Cross-Laminated Timber
12(CLT) slab, joined together and to the main structural system using only bolts and screws. Two novel floor solutions are
16steel beams. Specifically, the first proposed composite system is assembled using mechanical connectors whereas the 17 second involves the use of epoxy-based resin. In the paper, a FEM model is provided in order to extend this study to 18 other steel-timber composite floor solutions. In addition, the paper contains the design model to be used in 19 dimensioning the developed systems according to the state of the art of composite structures.
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