Foundations are components of a structure which ultimately transfer loads from the superstructure safely into the soil. Foundations are alternatively named as footings. Depending on the mechanism and the depth of the soil to which the loads are transferred, foundations can be broadly categorized into shallow foundations and deep foundations. Shallow foundations are those where the foundation loads
are transferred to a soil at shallow depth and where the load transfer mechanism is predominantly through resistance of the soil at the bottom of the foundations. The depth of shallow foundations is usually less than their largest dimension. Foundations which transfer the superstructure load to a soil layer found a large depth are said to be deep foundations. The resistance soil force on deep foundations is generated through two mechanisms; namely, tip resistance and side friction. This tutorial is entirely about shallow foundations.
Depending on the number and arrangement of columns they support and their geometry, shallow foundations can be classified into isolated, combined, strip and mat.
Isolated footings (or as sometimes called spread or single footings) are footings which support only one column. The load from the column may be only concentrated load, only moment or a combination of concentrated load and moment. The shape of the footings may be square, rectangular or circular. Combined footings are footings which support a number of columns along a single row. The number of columns is usually two. However, more than two columns can also be present on combined footings all aligned along a single row. The ratio of
the longer side to the shorter side of these foundations shouldn’t be considerably large. The shape of combined foundations can be either rectangular or trapezoidal. Strip foundations are those foundations where the shorter dimension of the foundation is negligible as compared to the longer dimension. The load on strip foundations may come either from a number of columns are from a long wall. Mat foundations are foundations which support many columns arranged in more than one row i.e. in two dimensions. These foundations may support all the columns of the entire building or a number of columns from portion of the building. During this tutorial, it is assumed that the user has prior knowledge about the theoretical design process of shallow foundations.
Details
| Title | Tutorial for Design of Foundations using CSI SAFE |
| Pages | 245 |
| Language | English |
| Format | |
| Size | 23 MB |
| Download Method | Direct Download |
| Download Links | BECOME A MEMBER VIEW DOWNLOAD LINKS |
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