Mat Foundation Design Example Pdf

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 foundation design example pdf.

Load path and transfer of seismic forces. 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. 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. 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.

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. Instructional materials complementing fema p 751 design examples foundation design 3. Mat or raft foundation is a large concrete slab supporting several columns in two or more rows. If a single square footing need to be designed under the maximum axial load that is occurred in columns type 4.

This foundation will be used for a loose sand soil. Example 8 3 4 see example 8 3 4 in textbook page 363. The properties used in the analysis and the design of this raft foundation are shown in table 4. Instructional materials complementing fema p 751 design examples.

45 x95 x7 0 with top of mat 3 6 below grade. 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. Design of raft foundation page 13 3 3 0 why raft should be used.