Floor beams are RC supporting horizontal elements for receiving the floor structure - "hollow core slabs", “TT slabs” and roof structures. The beams rely on the "short elements : corbels - consoles" or the tops of the columns. Depending on the way the slabs are supported and the shape of the cross-section, there are different types of floor beams. With the "L" type of beam, the "hollow core slabs" rely on only one side (on the “tooth” of the lower part of the beam). In an "reversed T" beam, the "hollow core slabs" is supported on both sides. The third type of beam is rectangular in cross-section where the "hollow core slabs" go over it. Floor beams can be classically reinforced and prestressed.