Ribbed slabs are usually suitable for medium to weighty loads, can span reasonable ranges, are quite firm and particularly ideal where the soffit is exposed. They provide a very good form where slab vibration is a viable issue.A rib width of greater than 125 mm is certainly usually needed to accommodate tensile and shear reinforcement.Reducing the extent of foundations by reducing the ultimate load.

Lighter and stiffer slab than an equivalent flat slab.

This saving of weight can change in structural characteristic.

Slab thickness of ribbed or waffle slabs is less than other slab systems.

All the Electrical appliances can be installed easily in the gap of the ribs which can be architecturally aesthetic. In many cases, long spans are desirable in the building. Ribbed or waffle slabs are an easy solution for this purpose.

Long slab spans can be constructed through ribbed and waffle Slabs.

Economical where the live loads are fairly small such as apartment houses, hotels.

The strength of concrete in tension is very small and so elimination of much of the tension concrete is done by the use of pan forms.

In this type of slab, the tension stress is eliminated in the tension side of the slab.

Waffle slab shows a ceiling which is suitable to install all the electrical appliances and can give a better outlook thus increasing the aesthetic factor. This type of slab is known as waffle slabs because they look like waffles with rows of beams running underneath them. Voids between all the domes reduce the dead load as the width of that portion of the slab is less than a flat slab. The dome-shaped forms create a matrix of voids surrounded by orthogonal ribbing, producing a two-way configuration very suitable for large-spanning slabs. The system was designed to decrease the weight of traditional full-concrete slabs. Two-way Ribbed Slab System (Waffle System) Concrete is cast between those spacing to make those ribs and in this way, the slab also cast and the slab becomes the flange of T beam. T beams are known as joists which are formed by setting steel pan at a constant spacing.

Two-way ribbed slab System (Waffle system)Ī brief description of these types are given below: One-way Ribbed Slab SystemĪ one-way joist floor slab consists of a series of small, reinforced concrete T beams that are connected with girders that in turn carried by the building column.

There are two types of ribbed slab system The ribs are tapered in cross-section in its lower part.

The spacing between the ribs should be in general 20-30 inch. The slab is the flange of the beam and the extended part is the web. Ribbed or waffle slab is a slab system which consists of series of parallel reinforced concrete T beams framing into reinforced concrete girders.

Ribbed slab etabs