Mat Foundation Design Example Pdf

Compensated foundation the net pressure increase in the soil under a mat foundation can be reduced by increasing the depth d f of the mat.

Mat foundation design example pdf.

A mat foundation also may be used to resist hydrostatic pressures or to bridge over small soft spots in the soil provided the mat is adequately reinforced. Instructional materials complementing fema p 751 design examples foundation design 3. Example 5 1 completes the analysis and design of shallow foundations for two of the alternative framing arrangements considered for the building featured in example 6 2. This foundation will be used for a loose sand soil.

If a single square footing need to be designed under the maximum axial load that is occurred in columns type 4. It is used where the supporting soil has low bearing capacity. Instructional materials complementing fema p 751 design examples. Although mat foundations are more difficult and more costly to design than individual spread footings they can be used effectively.

The bearing capacity increased by combining all individual footings in to one mat since bearing capacity is proportional to width and depth of foundations. Mat or raft foundation is a large concrete slab supporting several columns in two or more rows. 45 x95 x7 0 with top of mat 3 6 below grade. Design of raft foundation page 13 3 3 0 why raft should be used.

This approach is generally referred to as the compensated foundation design and is extremely useful when structures are to be built on very soft clays. Foundation foundation design 27 mat. Force on a pile eq on unloaded pile. Example 5 2 illustrates the analysis and design of deep foundations for a building similar to the one highlighted in chapter 7 of this volume of design examples.