Part 5
Mat Foundations
1
2
Combined footings and Mat (Raft) Foundations
Combined footing: footing that supports a line of two or more columns
Mat or Raft foundation: A ground concrete slab that supports more than one line of
columns
3
Combined footings can be classified generally under the
following categories:
a. Rectangular combined footing
b. Trapezoidal combined footing
c. Strap footing
Combined footings
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1. Flat plate (a). The mat is of uniform thickness.
2. Flat plate thickened under columns (b).
3. Beams and slab (c). The beams run both ways,
and the columns are located at the intersections
of the beams.
4. Flat plates with pedestals (d).
5. Slab with basement walls as a part of the mat (e).
Mat Foundations
5
Bearing Capacity of Mat Foundations
The gross ultimate bearing capacity of a mat foundation
For mats on sands, since the factor of safety against bearing capacity failure is very large, the designs are governed
by the settlement considerations
Net allowable bearing capacity of a mat foundation based on settlement considerations
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