In general, this thesis deals with timber-concrete-composite structures, more specifically, tim-ber-concrete-composite rib floors in new constructions. This form of construction combines the advantages of both materials. Resource-efficient ribbed cross-sections made out of wood-concrete composite are established through taking the material characteristics into account. Thereby, the connection between the two components plays an essential role. Various types of fastening elements can be used to establish such constructions. This thesis focuses on the usage of screws and grooves as a method to connect timber and concrete. When using screws, the bond is made via the drilled screw heads, which are being set in concrete slab. Grooves generate a form lock through concreting the moulded timber, which ensures the transmission of the working load.^ When analysing the different types of connection, following question arises: Which connection type is the most efficient choice for the considered spans of six, eight and ten meters? In order to answer this question, optimizations are implemented through assumptions of boundary conditions and variable parameters. The optimizations aim to create resource-efficient systems in terms of material properties and interconnection, as well as working time and cost-efficiency. For systems with screws, the optimizations, based on the spans examined, lead to an ideal screw spacing and the corresponding number of rows of connectors. Groove systems will get the most efficient cross sections by varying groove lengths and numbers. Here, the focus mainly lies on an even force distribution in the individual grooves. The optimization is primarily being reflected upon the technical perspective. However, the economic aspect of all examined cross sections is being analysed to complement the thesis.^ By means of the various optimizations, the most resource-efficient cross-sections for the tested connection techniques are being specified. Based on a final comparison of all results, a statement about the most suitable connection for respective spans, from a technical, as well as from an economical perspective, can be made.