Column Footing •In this type of foundation the base of the column is sufficiently enlarged to act as the individual support. The widened base not only provides stability but is useful in distributing the load on sufficient area of the soil. •Column footings are usually used in the foundations of residences and buildings where the soil is hard enough has has sufficient bearing capacity. Pressure distribution Under a Foundation •The law of distribution of pressure under a foundation depends on the homogeneity of the soil and flexibility of the base. If really the soil is homogeneous and the base of the foundation is flexible, the pressure distribution under the foundation will be uniform. On the contrary if the foundation base is absolutely rigid, the pressure distribution will not be uniform but may follow such pattern. •In our designs it is usual to assume a flexible base and hence to regard the pressure distribution to be uniform. This can be achieved by gradually decreasing the thickness of the base towards the edges so that the base is only as much thick as it is regarded to resist the induced moments and shears.
Posted on: Mon, 02 Sep 2013 11:57:37 +0000
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