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Definition and Types of Combined Footing

Combined footing is the arrangement of 2 footings. Initially, details about what is footing and its function are specified.

The function of a foundation or a footing is to transfer the load out of the structure to the underlying soil. Furthermore, the selection of appropriate sort of footing relies on the soil condition, the depth whereat the bearing strata rest, as well as the sort of superstructure.

Also, a combined footing is one that upholds 2 or additional columns at the founding level. That instance happens due to:

  • Column spacing is near and founding stratum’s safe bearing capacity is low. Thus, individual footings are going to overlap or overlay.
  • Column spacing is broad however loads of them are very large that the footings in case set one by one are going to overlap.

Use of Combined Footing

A combined footing is utilized on the basis of three contexts. It is utilized at the time the two columns are very close to one another that their individual or respective footings will overlap.

Furthermore, a combined footing is even offered at the time the property line is very close to a column that a spread footing will be eccentrically loaded at the times it completely under the property line.

Through combining or joining it with that of an inner column, the load is uniformly distributed.

Furthermore, a combined footing could be trapezoidal or rectangular in plan. Moreover, the trapezoidal footing is offered at the time the load on one column is greater than another column. They’re:

  • At the time the columns are so close to one another in order that their footings overlap.
  • At the time soil’s bearing capacity is less, needing additional area within the individual footing.
  • At the time the end column is close to a property line in order that its footing can’t spread in such direction.

Sorts of Combined Footings

1. Slab Type Combined Footing: Slab type combined footing upholds2 or additional column with bottom slab exclusively.

2. Slab Beam Type Combined Footing: Slab beam type combined footing upholds two or additional column with bottom slab as well as beam.

3. Strap Beam Type Combined Footing: Strap beam type combined footing is utilized at the time one column is situated on a property line, leading to is an eccentric load on a part of the footing.

Thus, offer a beam in the footing to the nearby column footing to control the overturning effect.

  • Trapezoidal Combined Footing
  • Rectangular Combined Footing

To get more details, go through the following video tutorial.

Lecturer: Civil Network

Download Sheet: Combined Footing Design

Also, Read

Definition and Types of Combined Footing