File Name: types of footing and their uses .zip
When a depth of foundation is less than the width of foundation then it is known as Shallow Foundation. Generally, shallow foundation placed no more than 6 ft depth from the lowest finished floor. The shallow foundation has a minimum depth of about mm and the maximum depth, not more than 4 meters the ground.
- Types of Foundation for Buildings and their Uses [PDF]
- Types Of Footings Used In Building Construction
- Types Of Footing Pdf
Surely everyone knows it is the essential part of the structure which transfers its overall load upon an area of soil. However, the load should not exceed the ultimate bearing capacity of the soil. The primary purpose of the foundation to make the structure stable and resist the structure from vertical and lateral forces.
Types of Foundation for Buildings and their Uses [PDF]
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Become VIP Member. Do you need to remove the ads? Foundations are classified as shallow and deep foundations. Types of foundations under shallow and deep foundations for building construction and their uses are discussed.
It is advisable to know the suitability of each type of foundation before their selection in any construction project. Individual footing or an isolated footing is the most common type of foundation used for building construction.
This foundation is constructed for a single column and also called a pad foundation. The shape of individual footing is square or rectangle and is used when loads from the structure is carried by the columns.
Size is calculated based on the load on the column and the safe bearing capacity of soil. Rectangular isolated footing is selected when the foundation experiences moments due to the eccentricity of loads or due to horizontal forces.
So, for a square footing, the length and width of the footing will be 1. Combined footing is constructed when two or more columns are close enough and their isolated footings overlap each other. It is a combination of isolated footings, but their structural design differs. The shape of this footing is a rectangle and is used when loads from the structure is carried by the columns.
Spread footings are those whose base is wider than a typical load-bearing wall foundations. The wider base of this footing type spreads the weight from the building structure over more area and provides better stability.
Spread footings and wall footings are used for individual columns, walls and bridge piers where the bearing soil layer is within 3m 10 feet from the ground surface. Soil bearing capacity must be sufficient to support the weight of the structure over the base area of the structure.
These should not be used on soils where there is any possibility of a ground flow of water above bearing layer of soil which may result in scour or liquefaction. The use of mat foundation is for columns and walls foundations where the loads from the structure on columns and walls are very high. This is used to prevent differential settlement of individual footings, thus designed as a single mat or combined footing of all the load-bearing elements of the structure.
It is suitable for expansive soils whose bearing capacity is less for the suitability of spread footings and wall footings. Raft foundation is economical when one-half area of the structure is covered with individual footings and wall footings are provided.
These foundations should not be used where the groundwater table is above the bearing surface of the soil. The use of foundation in such conditions may lead to scour and liquefaction.
Pile foundation is a type of deep foundation which is used to transfer heavy loads from the structure to a hard rock strata much deep below the ground level. Pile foundations are used to transfer heavy loads of structures through columns to hard soil strata which is much below ground level where shallow foundations such as spread footings and mat footings cannot be used.
This is also used to prevent uplift of the structure due to lateral loads such as earthquake and wind forces. Read More on Deep Foundations. Pile foundations are generally used for soils where soil conditions near the ground surface is not suitable for heavy loads.
The depth of hard rock strata may be 5m to 50m 15 feet to feet deep from the ground surface. Pile foundation resists the loads from the structure by skin friction and by end bearing.
The use of pile foundations also prevents differential settlement of foundations. Read More on Pile Foundation. Drilled shafts, also called as caissons, is a type of deep foundation and has an action similar to pile foundations discussed above, but are high capacity cast-in-situ foundations. The construction of drilled shafts or caissons are done using an auger. Drilled shafts can transfer column loads larger than pile foundations.
It is used where the depth of hard strata below ground level is located within 10m to m 25 feet to feet. Drilled shafts or caisson foundation is not suitable when deep deposits of soft clays and loose, water-bearing granular soils exist. It is also not suitable for soils where caving formations are difficult to stabilize, soils made up of boulders, artesian aquifer exists. Building foundations are broadly classified as shallow and deep foundations.
Types of shallow foundations are individual footing or isolated footing, combined footing, strip foundation, raft or mat foundation. Types of deep foundations are pile foundation and drilled shafts or caissons.
Drilled shafts has an action similar to pile foundations but are high capacity cast-in-situ foundations. It can transfer column loads larger than pile foundations. The use of raft or mat foundation is for columns and walls foundations where the loads from the structure on columns and walls are very high.
Rafts are used to prevent differential settlement of individual footings, thus designed as combined footing of all the load-bearing elements of the structure. Sign Up Sign Up to The Constructor to ask questions, answer questions, write articles, and connect with other people. Have an account? Sign In Now. Free Signup or Login to continue Reading Remember Me!
Don't have account, Sign Up Here. Forgot Password Lost your password? VIP Dashboard. Individual Footing or Isolated Footing 2. Combined Footing 3. Spread footings or Strip footings and Wall footings 4. Pile Foundations 6. Drilled Shafts or Caisson Foundation Summary:.
Spread footings. Raft or Mat Foundation. Pile Foundation. What are broad classifications of foundation? What are Types of Shallow Foundation? What are Types of Deep Foundation?
What are difference between pile foundation and drilled shafts? What are difference between isolated and combined footing?
When is Raft or Mat Foundations used? Previous article. Next article. Gopal Mishra. Related Posts.
Types Of Footings Used In Building Construction
The foundation distributes the load over a large area. So that pressure on the soil does not exceed its allowable bearing capacity and restricts the settlement of the structure within the permissible limits. Foundation increases the stability of the structure. The settlement of the structure should be as uniform as possible and it should be within the tolerable limits. Think for a Two storeyed building how much concrete needed? How much quantity of bars needed?
Footing is one of the most important parts of a structure which transfers loads of a structure to the underlying soil. The selection of suitable types of footing generally depends on the following factors:. Strip footing is a component of shallow foundation which distributes the weight of a load-bearing wall across the area of the ground. It is also known as wall footing. This type of footing is commonly used as foundations of load-bearing walls where the soil is of good bearing capacity. As the name suggests, a spread is given under the base of the foundation so that the load of the structure is distributed on wide area of the soil in such a way that the safe bearing capacity of the soil is not exceeded. These types of footings may be square, circular, or individually rectangular slab of uniform thickness, provided under each column.
Types of Foundation for Buildings and their Uses [PDF] · 1. Individual Footing or Isolated Footing · 2. Combined Footing · 3. Spread footings or Strip footings and.
Types Of Footing Pdf
Foundation is one of the essential parts of the structure. It is defined as that part of the structure that transfers the load from the structure constructed on it as well as its weight over a large area of soil in such a way that the amount does not exceed the ultimate bearing capacity of the soil and the settlement of the whole structure remains within a tolerable limit. Foundation is the part of a structure on which the building stands. The solid ground on which it rests is known as foundation bed. As we know that there are different types of soil, and the bearing capacity of the soil is different for each type of soil.
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