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Purposes and Functions of Foundations

By: Haseeb Jamal / On: May 06, 2017 / Types of, Definition
Purposes and Functions of Foundations
 
 

Definition :

The low artificially built part of a structure which transmits the load of the structure to the ground is called foundation.

OR

A foundation (also called a ground sill) is a structure that transfers loads to the earth.

Concept :

Foundation of a structure is always constructed below the ground level so as to increase the lateral stability of the structure. It includes the portion of the structure below the ground level and is built, so as to provide a firm and level surface for transmitting the load of the structure on a large area of the soil lying underneath. The solid ground on which the foundation rests is called the Foundation Bed.

Purpose of Foundation :

All engineering structures are provided with foundations at the base to fulfill the following objectives and purposes;

  1. To distribute the load of the structure over a large bearing area so as to bring intensity of loading within the safe bearing capacity of the soil lying underneath.
  2. To load the bearing surface at a uniform rate so as to prevent unequal settlement.
  3. To prevent the lateral movement of the supporting material.
  4. To secure a level and firm bed for building operations.
  5. To increase the stability of the structure as a whole.

Types Of Foundations

Foundations are broadly classified into two categories:

1) Shallow Foundations

  1. Spread footing or open trench foundations
  2. Grillage foundations
  3. Raft foundations
  4. Stepped foundations
  5. Inverted arch foundations

2) Deep Foundations

  1. Pile foundations
  2. Well foundations
  3. Caisson foundations
 

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