What is 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. Waffle slabs tend to be deeper than the equivalent ribbed 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 two way ribbed slab?
Two-way Ribbed Slab System (Waffle System) Voids between all the domes reduce the dead load as the width of that portion of the slab is less than a flat slab. This type of slab is known as waffle slabs because they look like waffles with rows of beams running underneath them.
What ribbed foundation?
The ribbed foundation solution consists of a thin slab, a pedestal/plinth in the center of the foundation and six to twelve arms that strengthen the slab. The ribbed foundation is a variant to the classic gravity foundation. Important parts of the concrete volume are replaced by backfill.
What is a rib in construction?
And all done with low wages laborers. At left a sketch of the steel reinforcement of the stem (rib) where rebars and stirrups are designed by structural calculations, to take the loads and stress depending of the conditions of the location of the building.
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 rib T beam?
The beam consists of a flange and a rib in the form of a T, generally made of RC concrete or metal is known as T-beam. The top part of the Slab which acts along the beam to resist the compressive stress is called flange. The part which lies below the slab and resists the shear stress is called rib.
What are the different types of slabs?
What are the 16 different types of slabs in construction?
- One-Way Flat Slab.
- Two-Way Flat Slab.
- Kitchen Slab.
- Sun Shade Slab.
- Lintel.
- Sunken Slab.
- Cable Suspension Slab.
- Pre-Tension Slab.
What is raft footing?
A raft foundation, also called a mat foundation, is essentially a continuous slab resting on the soil that extends over the entire footprint of the building, thereby supporting the building and transferring its weight to the ground. Stress is simply weight divided by area.
What is a rib in RCC?
The top part of the Slab which acts along the beam to resist the compressive stress is called flange. The part which lies below the slab and resists the shear stress is called rib.
How are ribbed concrete slabs used in construction?
STRUCTURAL RIBBED CONCRETE SLABS The CUPOLEX®floor slab can be fully or partially suspended on piles, stem walls or grade/edge beams. Additional reinforced internal ribs are then used in the slab by introducing PONTEX®, the structural CUPOLEX®accessory to provide a structure capable of spanning between foundations or piles.
What is the structural system of a ribbed slab?
In the analysis of ribbed slab as solid slab “traditional’, the structural system of the ribs is considered as beams supported on main cross beams which are considered as rigid supports. The supporting beams are assumed to be simple if there is one bay slab and continues supporting beams if there are more then one bay.
How are hollow block and ribbed slabs formed?
■ Modeling. 4. Introduction Hollow block and Ribbed slabs are formed by placing blocks on the slab and concrete ribs. In case of hollow block slab voided blocks are placed to reduce the total weight of the slab . In case of ribbed slab the blocks are not permanent.
How big is a hollow pot slab system?
Compared to the one way spanning ribbed slab system, the hollow pots system is limited to have a clear rib span of ~450mm which is the width of a hollow block. 1.2 WAFFLE SLAB DESIGN 1.2.1 INTRODUCTION
