Concrete Floor On Steel Beams

Reinforced concrete toppings are placed on the beams to connect units as can be seen in figure 11.

Concrete floor on steel beams.

The thickness of the concrete precast units is 150 160mm for hollow units and 75 100mm for solid units. 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. This floor system is composed of hollow or solid precast concrete units placed on steel beams on which shear studs are welded. Beams commonly transfer loads from floors and roof to the columns.

Precast concrete floor units are widely used in all types of building. Steel beam members can span up to 18m but the most usual range of steel beam spans rang from 3m to 9m. This results in a floor structure similar to a concrete flat plate but does not have downward projecting beams. Concrete placement on cambered steel beams is not a simple task.

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. It is estimated that 50 of multi storey steel framed buildings use precast concrete floors. The floor framing plan in figure 5 depicts beam camber for both infill beams and girders. Various prefabricated beam sections are available to be used in the construction multi storey steel frame structure.

The steel girders between the columns are cambered 19 mm 3 4 in and the infill steel beams are cambered 45 mm 1 3. The asymmetric steel beams have a wider bottom flange supporting the ends of the clt planks. The depth of the steel beams was designed to be encased within the thickness of the composite timber floor planks.