Mat Foundation Design Example Ppt

Structural design of mat foundations the structural design of mat foundations can be carried out by two conventional methods.

Mat foundation design example ppt.

Conventional rigid method approximate flexible method. The spread footings cover over 50 of the foundation area because of large column loads. Although mat foundations are more difficult and more costly to design than individual spread footings they can be used effectively. Design of raft foundation page 13 3 3 0 why raft should be used.

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. The soil is soft with a low bearing capacity. 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. Structural design of mat foundation free download as powerpoint presentation ppt pdf file pdf text file txt or view presentation slides online.

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. This also covers how to check ultimate moment resistance design reinforcement plac. Hydrostatic uplift resistance is needed etc. Finite difference and finite element methods can also be used but this section covers only the basic concepts of the first two design methods.

Force on a pile eq on unloaded pile pile supporting structure. If a single square footing need to be designed under the maximum axial load that is occurred in columns type 4. This is tutorial no 7 of raft mat foundation design course in csi safe. Unmoving soil eq motion.

Example 8 3 4 see example 8 3 4 in textbook page 363. Structural design of mat foundations the structural design of mat foundations can be carried out by two conventional methods. Load path and transfer of seismic forces. Instructional materials complementing fema p 751 design examples foundation design 3.

This foundation will be used for a loose sand soil. Finite difference and finite element methods can also be used but this section covers only the basic concepts of the first design method. The properties used in the analysis and the design of this raft foundation are shown in table 4. Deflected shape soil.