# What is an eccentric footing?

## What is an eccentric footing?

Faculty of Engineering Department of Civil Engineering Page 2 Eccentric Footing Eccentric footing: A spread or wall footing that also must resist a moment in addition to the axial column load.

How do you find the eccentricity of a footing?

Eccentricity is within 1/6 width of footing M = P*e, column moment in the x direction, e is eccentricity in x direction.

### What is eccentrically loaded foundation?

Normal footing becomes eccentrically load footing when there is an eccentricity in the loading or when there is a bending moment at the connection of footing and the column. The eccentricity could be in one direction or in both directions.

How do you calculate footing thickness?

How to Calculate Footing Size

1. Determine the width and length of the cement slab in inches.
2. Divide the width by 12 to convert it to feet.
3. Divide the length by 12 to convert it to feet.
4. Determine the depth or thickness that is required for the footing in inches.
5. Multiply the width by the length and then by the depth.

## What are the types of footing?

The different types of footings used in construction are described below:

• Continuous Wall Footing. The footing which supports a long masonry or RCC wall is known as a continuous footing.
• Isolated Footing.
• Combined Footing.
• Strip Footing.
• Strap Footing.
• Raft Footing.
• Pile Footing.

Where is eccentric footing used?

The eccentric footing is primarily used to the property line and avoids tilting the floor in a multi-story building. It needs to connect with another footing, such as a strap beam or combine foundation. It is better to plant a column at the edge of the foundation for a multi-story building.

Eccentric load is basically defined as the load whose line of action does not pass through the axis of the column, but also line of action of load passes through a point away from the axis of the column. In case of eccentric loading, there will be produced direct stress as well as bending stress in the column.

Footings that are not concentrically loaded are known as “Eccentric Footings”. In addition, when footings are subjected to an axial load “P” and bending moment “M” or lateral force “H”, the footing will experience unbalanced stress distributions along the base of the footing.

## Is top reinforcement required in eccentric footing?

Top reinforcement usually required when the concrete compressive stress is not enough to take the efforts generated. An eccentric footing is works structurally same as centered one, just, a two way design is mandatory.

What is the definition of eccentric loads?

An eccentric load is a load which resultant is applied outside of the centroid of the element (column, beam or foundation) where it is applied. The bigger the distance to the centroid the bigger the eccentricity.

### What is the eccentricity of a column?

The distance between the middle of cross-section of the column and the eccentric load is referred as eccentricity symbolized by e. Increase in the eccentric load increases the axial load and the moment acting on the column. This makes the column to bend additional increasing the bending of column.