Concrete Floor On Steel Beams

The precast concrete floor unit is used to span between supporting steel beams as an alternative to in situ concrete and metal decking.

Concrete floor on steel beams.

Beams commonly transfer loads from floors and roof to the columns. This floor system is composed of hollow or solid precast concrete units placed on steel beams on which shear studs are welded. This results in a floor structure similar to a concrete flat plate but does not have downward projecting beams. Steel beam members can span up to 18m but the most usual range of steel beam spans rang from 3m to 9m.

The thickness of the concrete precast units is 150 160mm for hollow units and 75 100mm for solid units. The mass provides a heat sink that absorbs heat during the day and then in combination with natural ventilation the heat is purged during the cooler night time. Reinforced concrete toppings are placed on the beams to connect units as can be seen in figure 11. The asymmetric steel beams have a wider bottom flange supporting the ends of the clt planks.

It is estimated that 50 of multi storey steel framed buildings use precast concrete floors. Precast concrete floor units are widely used in all types of building. Concrete placement on cambered steel beams is not a simple task. The floor framing plan in figure 5 depicts beam camber for both infill beams and girders.

The steel girders between the columns are cambered 19 mm 3 4 in and the infill steel beams are cambered 45 mm 1 3. Exposed concrete floors supported on steel beams and used to provide thermal mass provision of sufficient thermal mass is an important part of a low energy building solution. Erection of steel beams.