Mat Or Raft Foundation Ppt

The raft foundation is a kind of combined footing that may cover the entire area under the structure supporting several columns in one rigid body.

Mat or raft foundation ppt. Such a footing is called a raft or mat foundation. In this project the soil profile shows that the bearing stress is around 100 kn m2. It is use to support storage tanks industrial equipment s chimney s and various structure. Then a waterproof plastic sheet is laid over the earth and a thin 3 layer of plain cement concrete pcc is poured just to create a perfectly flat and level base for the foundation.

Determine the differential settlement 4. A shallow foundation system generally used when 1 the soil close the ground surface has sufficient bearing capacity and 2 underlying weaker strata do not. It is a continuous thick concrete slab on the soil that extends the entire footprint of the building and increases the soil bearing capacity power. Determine the settlement of foundation 3.

6 mat raft foundation 7 types of mat foundations 8 to design mat foundation. To design raft foundations. Raft foundation presentation ppt when to use raft or mat foundation in construction for building foundation design it is one of the most important aspects is to choose the right foundation. If the loads transmitted by the columns in a structure are so heavy or the allowable soil pressure so small that individual footings would cover more than about one half of the area it may be better to provide a continuous footing under all columns and walls.

Here is the list of some of the major aspects when to use or choose a mat foundation. Determine the stress distribution beneath the foundation 5. Raft foundation is generally used to support structures like residential or commercial buildings where soil condition is poor storage tanks silos foundations for heavy industrial equipment etc. How to construct a raft or mat foundation a raft foundation is constructed by first excavating the ground to a uniform flat level.

The soil is soft with a low bearing capacity. This foundation supports the entire building loads and safely transfer it to the ground. Lecture note cosc 421 m e. Usually mat foundation is spread over the entire area of the structure it is supporting.

R a f t f o u n d a t i o n s 10. The columns have high axial loads. Raft or mat foundation. The raft foundation is usually used with this kind of soil.

Working principle of raft foundation. Mat foundation is also known as the raft foundation. Mat foundation often considered to be used when dealing with the following conditions. Haque 2 shallow foundations are usually located no more than 6 ft below the lowest finished floor.

Determine the capacity of the foundation 2. The spread footings cover over 50 of the foundation area because of large column loads. Mat and pile foundation noroz fiaz malghani 2.