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. It is used where the supporting soil has low bearing capacity. The bearing capacity increased by combining all individual footings in to one mat since bearing capacity is proportional to width and depth of foundations. Instructional materials complementing fema p 751 design examples.

Force on a pile eq on unloaded pile. Mat or raft foundation is a large concrete slab supporting several columns in two or more rows. Example 8 3 4 see example 8 3 4 in textbook page 363. Design of raft foundation page 13 3 3 0 why raft should be used.

Foundation foundation design 27 mat. 45 x95 x7 0 with top of mat 3 6 below grade. If a single square footing need to be designed under the maximum axial load that is occurred in columns type 4. Instructional materials complementing fema p 751 design examples foundation design 3.

Although mat foundations are more difficult and more costly to design than individual spread footings they can be used effectively. Load path and transfer of seismic forces. The properties used in the analysis and the design of this raft foundation are shown in table 4. 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.