Mat Foundation Mat Footing Design

Mat foundations are sometimes preferred for soils that have low load bearing capacities but that will have to support high column or wall loads.

Mat foundation mat footing design. Design of a footing typically consists of the following. Footing design by s. 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.

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 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. 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. 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. Download free demo updated february 18 2019 soilstructure mat or raft foundation simplifies the calculation of combined footings and mats or rafts. Although mat foundations are more difficult and more costly to design than individual spread footings they can be used effectively. 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.

Spreadsheets are hard. Footings are designed based on the nature of the loading the properties of the footing and the properties of the soil. Mat or raft foundation is a large concrete slab supporting several columns in two or more rows. Ali mirza1 and william brant2 5 1 introduction reinforced concrete foundations or footings transmit loads from a structure to the supporting soil.