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A strap footing is a component of a building's 
foundation
Foundation may refer to:
* Foundation (nonprofit), a type of charitable organization
** Foundation (United States law), a type of charitable organization in the U.S.
** Private foundation, a charitable organization that, while serving a good cause ...
. It is a type of ''combined footing'', consisting of two or more column
A column or pillar in architecture and structural engineering is a structural element that transmits, through compression, the weight of the structure above to other structural elements below. In other words, a column is a compression member. ...
footings connected by a concrete beam. This type of beam is called a ''strap beam''. It is used to help distribute the weight of either heavily or eccentrically loaded column footings to adjacent footings.
A strap footing is often used in conjunction with columns that are located along a building's property or lot line. Typically, columns are centered on column footings, but in conditions where columns are located directly adjacent to the property line, the column footings may be offset so that they do not encroach onto the adjacent property. This results in an eccentric load on a portion of the footing, causing it to tilt to one side. The strap beam restrains the tendency of the footing to overturn by connecting it to nearby footings.
See also
*Shallow foundation
A shallow foundation is a type of building Foundation (engineering), foundation that transfers structural load to the earth very near to the surface, rather than to a subsurface layer or a range of depths, as does a deep foundation. Customarily, a ...
References
Building engineering Architectural elements {{Architecturalelement-stub