What is meant by ribbed slab?

What is meant by ribbed slab?

Ribbed and waffle slabs provide a lighter and stiffer slab than an equivalent flat slab, reducing the extent of foundations. Ribbed slabs are made up of wide band beams running between columns with narrow ribs spanning the orthogonal direction. Normally the ribs and the beams are the same depth.

What is a ribbed floor?

The ribbed floor is a type of R.C.C floor. Ribbed flooring is designed for use as a self-supported suspended floor, mostly, this type of floors are used in commercial buildings. If space between ribs is not filled and left as such it is known as ribbed floor. Ribs and topping act monolithically.

What is the disadvantage of ribbed slab?

Disadvantages of Ribbed and Waffle Slabs Not suitable where the live loads are huge as heavy manufacturing buildings, warehouses. The thickness of the slab is controlled as the requirement of fire resistance. Formwork cost is high. Sometimes difficult to install the electric equipment.

Where is ribbed slab used?

Ribbed slabs are suitable for medium to heavy loads, can span reasonable distances, are very stiff and particularly suitable where the soffit is exposed. Slab depths typically vary from 75 to 125 mm and rib widths from 125 to 200 mm. Rib spacing of 600 to 1500 mm can be used.

What is the difference between ribbed and solid slab?

Ribbed slabs are slabs cast integrally with a series of closely spaced joists which in turn are supported by a set of beams. The main advantage of ribbed floors is the reduction in weight achieved by removing part of concrete below the neutral axis. Solid slabs of uniform thickness can be one-way or two way.

What are the types of slabs?

  • FLAT SLAB. Flat slab is also known as beam-less slab because it is supported directly by columns or caps.
  • CONVENTIONAL SLAB.
  • HOLLOW CORE RIBBED SLAB OR HOLLOW CORE SLAB.
  • HARDY SLAB.
  • WAFFLE SLAB.
  • SUNKEN SLAB.
  • PRESTRESSED CONCRETE SLAB.
  • PRECAST SLAB.

What is the difference between solid and ribbed slab?

A Ribbed Slab gives considerable extra strength in one direction while a waffle slab gives added strength in both directions. And this is possible only in monolithically cast concrete which is the two-way grid of beams. In comparison to the solid slab, the span limits of ribbed slabs are considerably longer.

What is a concrete rib?

Super rib construction joint rib mesh or SP Rib is a galvanized mesh used to form construction joints, wall joints and slab joints. This expanded metal formwork allows concrete to flow through the key joint and can be used for beams, walls, soffits and columns, both horizontally and vertically.

What is the disadvantage of waffle slab?

Disadvantages of Waffle Slabs Waffle slab was not used in conventional construction projects. Its is expensive, so it is only economical when large scale production of similar units is desired. Construction requires rigorous supervision and skilled labour.

What is flat slab and where it is provided?

Flat slab is an RCC slab built monolithically with supporting columns and reinforced in two or more directions. Beams are not provided to support the slab. The loads are directly transferred to the columns. In flat slabs, the columns are provided with enlarged heads called capitals or column heads.

What is the difference between solid and Ribbed Slab?

What is a solid slab?

The solid slab is a customised, loosely reinforced, full concrete slab which is used in residential and industrial construction. The solid slab has a smooth formwork underside with a high surface quality and can therefore be wallpapered or painted.

Is there such a thing as a ribbed floor?

Ribbed floors consisting of equally spaced ribs are usually supported directly by columns.They are either one-way spanning systems known as ribbed slab or a two-way ribbed system known as a waffle slab. This form of construction is not very common because of the formwork costs and the low fire rating.

What kind of slab is a ribbed slab?

Ribbed slabs are made up of wide band beams running between columns with narrow ribs spanning the orthogonal direction. Normally the ribs and the beams are the same depth. A thin topping slab completes the system.

How are ribs made in a concrete slab?

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. The system was designed to decrease the weight of traditional full-concrete slabs.

What is the difference between a ribbed and a waffle slab?

Ribbed or waffle slab is a slab system which consists of series of parallel reinforced concrete T beams framing into reinforced concrete girders. The slab is the flange of the beam and the extended part is the web.