Mat Foundation Design Pdf

The conventional rigid method and the approximate flexible method.

Mat foundation design pdf.

Design will require extension of the column foundation beyond the property line. Mat or raft foundation is a large concrete slab supporting several columns in two or more rows. This type of foundation tends to be heavily overde signed for three major reasons. The structural design of mat foundations can be carried out by two conventional methods.

In such a case two or more columns can be supported on a single rectangular foundation as shown in figure 5 1b. 10 2 types of mat foundations figure 10 1 illustrates several possible mat foundation configurations. Foundation design 28 a plastic solution b elastic solution. Probably the most common mat design consists of a flat concrete slab 0 75 to 2 m thick and with continuous two way reinforcing top and bottom.

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. Finite difference and finite element methods can also be used but this section covers only the basic concepts of the first design method. It is used where the supporting soil has low bearing capacity. Elastic is not.

If the net allowable soil pressure is known. Although mat foundations are more difficult and more costly to design than individual spread footings they can be used effectively. 45 x95 x7 0 with top of mat 3 6 below grade. Foundation foundation design 27 mat.