Design of footing
Footings are the bases laid on the soil on top of which a structure is erected. Thus, it is the foundation on which a building or any such structure stands upon. They are made of concrete having reinforcements inside them and are poured into an excavated ditch or conduit. Before the foundation is built, a test is done to assess the strength ofthe soil bearing capacity to ascertain the type of foundation to be built.
Given below are the types of footing and the situation under which they are applied is defined for better understanding-
Isolated Footing
Combined Footing
Raft Footing
Pile Footing
If the soil is soft or it is clay, then it cannot hold the structure if a strong foundation is not provided. In such a situation, the pile foundation is preferred.
This is because the pile foundation transfers the load by the action of end bearing and skin friction.
In case the soil is adequate in strength, then an isolated foundation is preferred. Generally, in residential buildings, isolated and combined footings are mostly preferred.
If the distance between isolated footings is such that the ends touch each other or they overlap, then this implies that the distance between the column and the foundation is small.
Hence, in such cases a combined footing is preferred as it makes the structure stable and economic.
In other cases, if the soil is weak at shallow depth, then instead of a pile foundation, a raft foundation is built as it can distribute loads under the structure efficiently.
Furthermore, the presence of secondary and primary beams tends to make the structure more stable in the raft foundation
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Footings are the bases laid on the soil on top of which a structure is erected. Thus, it is the foundation on which a building or any such structure stands upon. They are made of concrete having reinforcements inside them and are poured into an excavated ditch or conduit. Before the foundation is built, a test is done to assess the strength ofthe soil bearing capacity to ascertain the type of foundation to be built.
Given below are the types of footing and the situation under which they are applied is defined for better understanding-
Isolated Footing
Combined Footing
Raft Footing
Pile Footing
If the soil is soft or it is clay, then it cannot hold the structure if a strong foundation is not provided. In such a situation, the pile foundation is preferred.
This is because the pile foundation transfers the load by the action of end bearing and skin friction.
In case the soil is adequate in strength, then an isolated foundation is preferred. Generally, in residential buildings, isolated and combined footings are mostly preferred.
If the distance between isolated footings is such that the ends touch each other or they overlap, then this implies that the distance between the column and the foundation is small.
Hence, in such cases a combined footing is preferred as it makes the structure stable and economic.
In other cases, if the soil is weak at shallow depth, then instead of a pile foundation, a raft foundation is built as it can distribute loads under the structure efficiently.
Furthermore, the presence of secondary and primary beams tends to make the structure more stable in the raft foundation
Download
*