Image: Sketch of composite beams with in-situ concrete slab - bauwion
In this slab system, an in-situ concrete slab forms the upper chord of the steel composite girders. Head bolt anchors, which are welded to the steel beam and are poured with the concrete of the ceiling slab, have become established as composite agents. In this way, a force-fit beam bond is created between the materials steel and reinforced concrete. Despite the good possibilities in terms of sound insulation and fire protection, the use of composite beams with in-situ concrete slab on formwork is declining today because the formwork effort is high. Small, nested surfaces can be realized or can be realized well in this design. A lost formwork under the in-situ concrete slab, e.g. in the form of sheet metal, is also conceivable.
The composite beams are individually manufactured in steel mills from standardised beam profiles. They are to be constructed and dimensioned in accordance with Eurocode 4. The in-situ concrete slab is regulated in Eurocode 2 and the associated standards.
Source: bauwion
