Foundation

Foundations

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Foundations

A foundation is the base upon which the building rests. The foundation is also known to transfer the load of the building to that which transfers load to the ground.

Prepared by Mr. Forbes

Multiple Choice

(Ice breaker)Fill in the blanks- Foundation is the ____________ upon which the building rests

• bass

• bace

• base

Functions of Foundations

• Provides stability for the structure

• Transfers loads evenly from the building to the supporting soil

• Provide a base for the building

• Protect against damage due to the shrinkage of soil

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Types of Foundations

• Pad Foundations

• Strip Foundations

• Raft Foundations

• Stepped Foundations

• Piles

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Pad Foundation

• Pad foundation is an independent square or rectangle concrete slab with a pier or column bearing in the centre of it.

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Strip Foundation

This is oldest and most common form of foundation This foundation is used where load bearing capacity of the ground is low. For example in

• Made up ground

• Soft clay silt

• Marshy ground​

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Raft Foundation

Raft foundation is used on soft or weak soil like in swampy areas. Raft foundations are constructed by pouring concrete over a large areas.

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Stepped Foundation

• Step Foundations are built on sloping sites. This is done to reduce the amount of excavation and materials required to produce an adequate foundation

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Piled Foundation

Pile Foundations such as Bored Piles (which is shown below) are used when the the soil is shrinkable due to moisture movement

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Multiple Choice

Which of these foundations is known as Pad Foundation?

Multiple Choice

Which type of Foundation is used here?

• Pad Foundation

• Piled Foundation

• Strip Foundation

• Raft Foundation

Multiple Choice

Which Foundation is used in swampy areas?

• Pad Foundation

• Strip Foundation

• Piled Foundation

• Raft Foundation

Multiple Choice

Which Foundation is used sloping sites?

• Piled Foundations

• Strip Foundation

• Stepped Foundation

• Pad Foundation