Entwicklung Eines Multifunktionalen Deckensystems mit Erhöhter Ressourceneffizienz

The need of sustainable buildings demands the design of multifunctional slabs considering more than only structural aspects. The paper presents state-of-the-art solutions for multifunctional slabs and a novel type of composite floor system using cellular beams. A major benefit of the multifunctional slabs is the integration of an installation floor. The new developed system "Topfloor integral" uses half cellular beams made of existing hot-rolled sections with welded reinforcing bars. The openings in the cellular beams allow the placing of installations in all directions, thus providing excellent flexibility to the user when maintaining or changing installations. The results of tests on the structural behavior and the load-carrying capacity are presented and compared to proposed design models for the "Topfloor integral" slabs. Local stresses caused by shear forces at the web openings are discussed. Additional information about lateral-torsional-buckling, the design of the shear connection using common reinforcing bars, the fire resistance and the dynamic behavior are given. Finally, the paper presents some examples of first buildings where the novel type of floor system is used.