# Footing Design

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## Structural Footing Design

ASDIP FOUNDATION is an engineering software that performs the structural design of concrete footings, such as isolated spread footings, two-column combined footings, strap footings, wall footings, piles, and pile caps.

Below are listed some blog posts that we have published with the best content about footing design.

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## What is Structural Footing Design?

A typical concrete slab in a building floor may be supported by a series of beams and girders, which in turn are supported by the building columns or walls. The loads are then transferred to the foundation.

Concrete footings are structural elements that distribute the loads from the building to the underlying soil, in such a way that the soil bearing pressures are within the allowable limits.

The structural analysis consists on the calculation of the effects of the loads applied to the structure, at the base of the building, also called the column reactions. These are typically the shear and axial forces as well as the bending moments transferred to the foundation system.

### The Footing Design Process

The footing design process consists of the interpretation of the analysis results and the application of the building code provisions to produce footings both economic and structurally safe. For example, a spread footing design will consist of the calculation of the footing size and the required rebars to produce an adequate flexural and shear strength.

A combined footing is a structural member that supports two columns relatively closely spaced. The combined footing design mainly consists on the calculation of the bearing pressures for the footing size and shape, which may be rectangular or trapezoidal. The shear and moment diagrams are then generated in order to calculate the required reinforcing bars.

A strap footing is a structural system composed of two isolated footings tied together with a trap beam. It is applicable when the distance between footings is relatively long for a combined footing to work. The design of such a system consists on the calculation of the bearing pressures at both columns for the footing sizes. The steel reinforcement of the footings and the strap beam is then calculated by generating the shear and moment diagrams for the system.

Pile caps are structural elements designed to transfer the loads from the structure to the pile foundation. They are almost invariably made of reinforced concrete, and designed to resist all the applied loads above the cap, including the self-weight and the soil on top. The pile cap is considered a perfectly rigid structure that transfers these loads to the supporting piles. The piles are considered pinned at the top, since a true fixed connection is very difficult to achieve at the field.

ASDIP FOUNDATION includes the design of all these types of concrete footings described above. The ASDIP team has published a series of blog posts on a regular basis covering many technical topics related to the design of concrete footings. Our philosophy is to provide the engineering community in general, and particularly our customers, the required tools to complete the structural design tasks effectively in less time and with less effort. You are invited to download the 15-day free trial using the buttons below.