Image: Sketch of composite beams with precast slab - bauwion
This slab system combines the classic reinforced concrete prefabricated slab, also known as a filigree slab, with steel composite beams. The element slab forms the upper chord of the composite girders and is cast with them. Head bolt dowels, which are welded to the steel girders, have become established as composite means. In this way, a force-fit beam bond is created between the materials steel and reinforced concrete. The semi-prefabricated elements of the precast slab serve as formwork during the concreting process. They connect to the concrete layer via reinforcement protruding from the component. In order to connect the semi-precast panels to the composite girders, reinforcement loops protruding from the slabs are placed over the head bolts of the composite girder and thus connected to them. Adjusting these loops in relation to the bolt position can prove difficult in practice.
Before concreting the concrete layer, the upper reinforcement must be laid. Installation support is necessary. 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 precast slab is regulated in Eurocode 2 and the associated standards.
Source: bauwion
