Mat or raft foundation is a large concrete slab supporting several columns in two or more rows.
Mat foundation ppt.
It is used where the supporting soil has low bearing capacity.
6 mat raft foundation 7 types of mat foundations 8 to design mat foundation.
Hydrostatic uplift resistance is needed etc.
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Mat foundation raft foundation it is a combined footing that may cover the entire area under a structure supporting several columns and walls.
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Mat foundations 10 1 introduction a mat foundation is a large concrete slab used to interface one column or more than one col umn in several lines with the base soil.
Raft mat foundation is used in those places where we have less bearing capacity of the soil.
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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.
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Presentation on mat foundation 1.
The spread footings cover over 50 of the foundation area because of large column loads.
The soil is soft with a low bearing capacity.
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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.
The bearing capacity increased by combining all individual footings in to one mat since bearing capacity is proportional to width and depth of foundations.
It may encompass the entire foundation area or only a portion.
Although mat foundations are more difficult and more costly to design than individual spread footings they can be used effectively.
Mat foundations are sometimes preferred for soils that have low load bearing capacities but that will have to support high column or wall loads.
A mat may be used to support on grade storage tanks or several pieces of indus trial equipment.
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