Mat Footing Design Example Pdf

It is used where the supporting soil has low bearing capacity.

Mat footing design example pdf.

The building has a 10 ft high basement. The bottom of the footing is 13 ft below finished grade. This approach is generally referred. Instructional materials complementing fema p 751 design examples.

Load path and transfer of seismic forces. 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. Although mat foundations are more difficult and more costly to design than individual spread footings they can be used effectively. Mat or raft foundation is a large concrete slab supporting several columns in two or more rows.

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. 45 x95 x7 0 with top of mat 3 6 below grade. Example 8 3 4 see example 8 3 4 in textbook page 363. Foundation foundation design 27 mat.

Instructional materials complementing fema p 751 design examples foundation design 3. 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. Force on a pile eq on unloaded pile. The bearing capacity increased by combining all individual footings in to one mat since bearing capacity is proportional to width and depth of foundations.