Mat Or Raft Foundation

Now what is raft foundation.

Mat or raft foundation.

Raft foundation is a thick concrete slab reinforced with steel which covers the entire contact area of the structure like a thick floor. In this project the soil profile shows that the bearing stress is around 100 kn m2. Soilstructure mat or raft foundation simplifies the calculation of combined footings and mats or rafts. Spreadsheets are hard to preserve and it is time consuming to calculate shear moment deflection and bearing pressures.

The mat foundation which is sometimes known as a raft foundation is a combined footing that could cover the whole area under a structure supporting several walls and columns. The bearing capacity increased by combining all individual footings in to one mat since bearing capacity is proportional to width and depth of foundations. Usually mat foundation is spread over the entire area of the structure it is supporting. A raft foundation also called a mat foundation is essentially a continuous slab resting on the soil that extends over the entire footprint of the building thereby supporting the building and transferring its weight to the ground.

The raft foundation is usually used with this. This program currently supports both the si units english units. A raft or mat foundation is a large continuous rectangular or circular concrete slab that carries the entire load of the superstructure and spreads it over the whole area beneath the building. Mat foundations are sometimes preferred for soils that have low load bearing capacities but that is going to need to support high wall or column loads.

A raft or mat foundation consists of a large concrete slab or a slab and beam system resting on soil or rock and supporting all the loads through a number of columns or walls. It is used where the supporting soil has 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. Sometimes area covered by raft may be greater than the contact area depending on the bearing capacity of the soil underneath.

It is considered as one type of shallow foundation and is useful in controlling the differential settlement. When the raft foundation is supported on piles it is called a piled raft.