Part 1: Architect’s Guide 1 - 24 4.3.3 Precast slab with in-situ topping Plain slabs are generally composed of a precast slab and cast-in-situ concrete. At the concreting stage, temporary supports may be needed to transfer the weight of the precast slab, the concrete and operatives working on the site. The slab can contribute to the bending resistance and stiffness of the beams if an appropriate connection (welded studs for instance) is provided between the slab and the beam – see composite beams in Table 4.3. 4.3.4 Hollow core slabs Prefabricated hollow-core slabs are generally used with integrated floor beams (non composite beams). These elements can be placed on angles welded to the web or on the lower flange (see Figure 4.15, Figure 4.8 and Figure 4.9). A structural concrete topping with reinforcement is recommended in order to tie the units together to serve as a diaphragm component. Figure 4.15 Hollow core slab 4.3.5 Prefabricated composite slab elements This type of floor is manufactured in elements, the width of which is 1,20 m and the length up to 7,00 m as shown in Figure 4.16. 1 2 3 4 1 Concrete slab 2 Steel mesh 3 Thermal and acoustic insulation 4 U-shaped liners Figure 4.16 Prefabricated composite slab elements 4.3.6 Dry floors Dry floors are made of a mechanical assembly of industrialized components (see Figure 4.17). The main properties of dry floors are: Lightness Acoustic performance
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