What is Pad Foundation?


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Mar 28, 2023
What is Pad Foundation?

The foundation pad are the shallow foundations that absorb and spread load points on the soil with safety. Pad foundations are recommended when the soil on the site is strong enough and isn't too deep to build. The thickness of foundations for pad construction is generally uniform. In some cases, the top surface may be sloped or sloped.The layout of the pad foundation is straight and simple that makes them an affordable solution.

Design Principle of Pad Foundation

According to the definition, the pad foundation must spread the load securely over the stratum bearing. Thus, the pad foundation has to be designed to be stiff enough that an even distribution of the load over the soil can occur without causing the foundation pressure to exceed the limit of bearing stress. This can be accomplished through either strengthening the pad or by making the pad deeper. Both methods help to distribute the force over an angle that is predetermined.

This angle will be calculated in accordance with the bearing capacity of the base soil as well as the strength of the concrete. The pad's size should be sufficient to ensure that tension needs to be kept out of the concrete to ensure that there is no cracking that could lead to failure. Resistance to the shear of punching is the main criterion that determines the thickness of concrete pad foundations reinforced. Another crucial factor that determines the pad's depth is its capacity to resist the stretching.

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Pad foundation types

These are the different types of pad foundations employed in the construction

  • Plain Concrete Pad Foundation
  • Reinforced Concrete Pad Foundation
  • Combined Pad Foundation
  • Continuous Pad Foundation
  • Pad Foundations that have Ground Beam
Different pad foundation types are discussed in detail below.

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Plain Concrete Pad Foundation

Pad foundations are able to be reinforced or not. Pad foundations made of plain concrete are not reinforced foundations. In the case of a pad foundation with no reinforcement the foundation's thickness must be greater or equal to than the width that is required of the foundation in order to spread the load. This type of foundation may be utilized when the loads from the superstructure are not too heavy.

Reinforced Concrete Pad Foundation

The reinforcement in pad foundations reduces the thickness of the foundation. To make it easier to construct the pads are typically made to be square plan areas. They are also utilized, particularly in cases of eccentric and inclined loads.

Combined Pad Foundation

The foundations of a combined pad are typically employed for columns that are placed close to the property's boundary or when the pad isn't able to extend in a specific direction due to any other reason like the presence of utility lines or services. In this kind foundation, the pad of an external column is linked to the pad of the internal column in order to offset the weights.

Continuous Pad Foundation

These types of pad foundations are used when the columns are carefully set and the pad foundations are overlapping. The reinforcement provided by continuous foundations ensures long-term rigidity. This type of foundation could also use to protect against the effects of differential settlement.

Pad Foundations that have Ground Beam

This kind of foundation and its function is similar to the combined pad foundation. In this instance instead of a continuous foundation, separate pads are linked via ground beams. The ground beams are used to provide integrity and balance the load of the eccentric.

Pad foundations are among the most widely used and cost-effective foundation systems when the loads of superstructures are minimal. The dimension of the pad is contingent on the capacity of bearing of the soil as well as the load of the structure. The form of the foundation will depend on the arrangement of columns and other site conditions like the space available for construction.

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