Mat Foundation Mat Footing Design

Footing design by s.

Mat foundation mat footing design.

It is common to use mat foundation or deep basements to transfer the column loads to the underlying soil as well as provide floor slab for the basement. Mat or raft foundation is a large concrete slab supporting several columns in two or more rows. Mat foundations also are known as raft foundations is a thick concrete slab placed on the ground as the foundation of the structure. Raft mat foundation is used in those places where we have less bearing capacity of the soil.

Mat foundations are sometimes preferred for soils that have low load bearing capacities but that will have to support high column or wall loads. The bearing capacity increased by combining all individual footings in to one mat since bearing capacity is proportional to width and depth of foundations. At those places we use mat foundations to distributes the whole loads of the structure to the soil when the area of the footing was increase than the soil load bearing capacity will also increase because this foundation reduces the stress on the soil at the same place. Complete analysis design of a mat or raft foundation analyses uniform thickness finite mat or raft foundation with free ends and supported by a beam on elastic foundation.

Mat foundation raft foundation it is a combined footing that may cover the entire area under a structure supporting several columns and walls. 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. Mat foundations are constructed on various occasions such as building construction bridge construction tower construction etc. It is used where the supporting soil has low bearing capacity.

Footings are designed based on the nature of the loading the properties of the footing and the properties of the soil. A mat foundation is used when the subsoil is weak and column loads are so heavy that the conventional spread footings cover more than 50 of the building area. Spreadsheets are hard. Design of a footing typically consists of the following.