Mat Or Raft Foundation Ppt

In this project the soil profile shows that the bearing stress is around 100 kn m2.

Mat or raft foundation ppt.

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. The soil is soft with a low bearing capacity. 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. R a f t f o u n d a t i o n s 10.

Lecture note cosc 421 m e. Determine the differential settlement 4. Mat foundation is also known as the raft foundation. Determine the settlement of foundation 3.

Working principle of raft foundation. Design the structural component of the mat foundation using the stress distribution obtain from 4. Determine the capacity of the foundation 2. 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.

Mat foundation often considered to be used when dealing with the following conditions. The spread footings cover over 50 of the foundation area because of large column loads. The raft foundation is usually used with this kind of soil. It is use to support storage tanks industrial equipment s chimney s and various structure.

Here is the list of some of the major aspects when to use or choose a mat 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. Mat and pile foundation noroz fiaz malghani 2. The columns have high axial loads.

Hydrostatic uplift resistance is needed etc. Determine the stress distribution beneath the foundation 5. Usually mat foundation is spread over the entire area of the structure it is supporting. 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.

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. 6 mat raft foundation 7 types of mat foundations 8 to design mat foundation. 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. Such a footing is called a raft or mat foundation.

To design raft foundations. Haque 2 shallow foundations are usually located no more than 6 ft below the lowest finished floor. How to construct a raft or mat foundation a raft foundation is constructed by first excavating the ground to a uniform flat level.