A strap footing between two block foundations can be design in the general foundation design mode and in the plant foundation mode, for horizontal vessel foundations. The strap footing is a strap beam (i.e., grade beam) which connects two otherwise isolated footings.

When a strap footing is present between two footings, any moment which is the result of loads acting in the longitudinal direction of the beam are then resisted by the beam. The beam's size and reinforcement is calculated accordingly to resist this moment. For example, for forces acting parallel to the longitudinal axis of the beam, the resulting moment, M_z, is considered to be resisted by the strap beam alone.

If two footings at the end nodes of the strap beam are designating to be Identical Footings on the Footing Geometry page, then both two footing will both be designed for the same critical condition occurring in either footing.