Combined Footing Design Example

Two or more column footings affixed by a concrete beam is acknowledged as combined footing. This category of beam is known as a strap beam. It is utilized to help share out the burden of either heavily or eccentrically loaded column footings to nearby footings.

The purpose of a footing or a foundation is to transfer the load form the composition to the suppressed soil. The selection of appropriate type of footing is determined by the depth at which the bearing strata exist, the soil state and the kind of superstructure.

Combined footing: At any time two or more columns in a straight line are carried on a single spread footing, it is termed a combined footing. Sole footings for each column are usually the economical.

Combined footings are offered only when it is extremely essential, as

  • Whenever two columns are nearby together, inducing overlap of adjacent isolated footings
  • Where soil bearing capacity is low, inducing overlap of adjacent isolated footings
  • Nearness of building line or existing building or sewer, next to a building column.

Kinds of Combined Footing:

  • The combined footing may be rectangular, trapezoidal or Tee-shaped in design.
  • The geometric measures and formations are so rigid that the centroid of the footing area overlaps with the finish result of the column loads.

Download Sheet: Combined Footing Design

Combined Footing Design Example