Is Spread Footing the same as pad footing?

Isolated footings (also known as Pad or Spread footings) are commonly used for shallow foundations in order to carry and spread concentrated loads, caused for example by columns or pillars.

What is mat footing?

Mat footings are used when the building load is so high, that spread or strip footings could not bear the weight or their employment would be inefficient. Furthermore, mat footings are helping to reduce the varying settlements caused by construction on non-homogenous soils or uneven load distribution on the footing.

What is a spread footing used for?

Spread footings are used to support a foundation or set of piers below a building. To add additional support, spread footings are constructed with concrete and reinforced with steel.

What is difference between Mat and raft footing?

Usually, mat foundation is spread over the entire area of the structure it is supporting. Raft foundation is generally used to support structures like residential or commercial buildings where soil condition is poor, storage tanks, silos, foundations for heavy industrial equipment etc.

What are the types of spread footing?

Types of Spread Foundation

• Wall Spread Footing. Wall Footing is also known as strip footing.
• Isolated Footing or Column Footing.
• Combined Footing.
• Strap Footing.
• Continuous Footing.
• Inverted Arch Footing.
• Grillage Footing.
• Raft Foundation.

What is stepped Spread Footing?

A spread footing foundation has a wider bottom portion compared to a load-bearing foundation; the wider bottom “spreads” the weight of the structure over a larger area for greater stability. Spread footings are used to support a foundation or set of piers below a building.

What is mat foundations?

A raft or mat foundation is a large continuous rectangular or circular concrete slab that carries the entire load of the superstructure and spreads it over the whole area beneath the building. It is considered as one type of shallow foundation and is useful in controlling the differential settlement.

What is the advantage of mat foundation?

Mat foundation can be provided where the shallow foundation is necessary but soil condition is poor. It resists differential settlement. Mat foundation requires less earth excavation. Mat foundation itself can be considered as a floor slab.

What are the different type of combined footing?

The combined footing should be rectangular combined footing, trapezoidal combined footing, strap combined footing, and raft combined footing. In this combined footing the maximum bending moment takes as the design value for the reinforced concrete footing.

Is raft foundation and mat foundation same?

The terms “raft footing” and “mat foundation” describe the same type of building foundation. Both envision a horizontal plane, or slab, of reinforced concrete upon which you construct a building.

Why mat foundation is known as raft foundation?

It is a suitable solution for low bearing capacity soil, spread footing cover about 70\% of the structure, high structure loads, soft pockets or cavities of in the soil to unknown extent raft, and highly compressible soil that extends to a great depth. Functions of Mat Foundation.

What is a mat slab foundation?

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. This reduces the stress on the soil.