Mat Or Raft Foundation Ppt

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.

Mat or raft foundation ppt.

The spread footings cover over 50 of the foundation area because of large column loads. This foundation supports the entire building loads and safely transfer it to the ground. Determine the settlement of foundation 3. Lecture note cosc 421 m e.

The columns have high axial loads. How to construct a raft or mat foundation a raft foundation is constructed by first excavating the ground to a uniform flat level. Working principle of raft foundation. Mat and pile foundation noroz fiaz malghani 2.

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. 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. Hydrostatic uplift resistance is needed etc. The raft foundation is usually used with this kind of soil.

Design the structural component of the mat foundation using the stress distribution obtain from 4. R a f t f o u n d a t i o n s 10. The soil is soft with a low bearing capacity. 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.

6 mat raft foundation 7 types of mat foundations 8 to design mat foundation. Such a footing is called a raft or mat foundation. Haque 2 shallow foundations are usually located no more than 6 ft below the lowest finished floor. 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.

To design raft foundations. Mat raft foundation a mat foundation is a thick reinforced concrete slab supporting arrangement of column s or walls in a row and transmitting the load into the soil. Determine the capacity of the foundation 2. In this project the soil profile shows that the bearing stress is around 100 kn m2.

Determine the stress distribution beneath the foundation 5. It is use to support storage tanks industrial equipment s chimney s and various structure. Mat foundation is also known as the raft foundation. 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.

Mat foundation often considered to be used when dealing with the following conditions. 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. Determine the differential settlement 4.