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Uses of Piles

The major uses of piles are: 1. To carry vertical compression load. 2. To resist uplift load. 3. To resist horizontal or inclined loads.   Normally vertical piles are used to carry vertical compression loads coming from superstructures such as buildings, bridges etc. The piles are used in groups joined together by pile caps. The  Full Article…

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Types of Piles According to Their Composition

Piles may be classified according to their composition as 1. Timber Piles, 2. Concrete Piles, 3. Steel Piles. Timber Piles: Timber piles are made of tree trunks with the branches trimmed off. Such piles shall be of sound quality and free of defects. The length of the pile may be 15 m or more. If  Full Article…

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Classification of Piles

Piles may be classified as long or short in accordance with the L/d ratio of the pile (where L = length, d = diameter of pile). A short pile behaves as a rigid body and rotates as a unit under lateral loads. The load transferred to the tip of the pile bears a significant proportion  Full Article…

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Floating Foundation

General Consideration A floating foundation for a building is defined as a foundation in which the weight of the building is approximately equal to the full weight including water of the soil removed from the site of the building. This principle of flotation may be explained with reference to Fig. 14.4. Fig. 14.4(a) shows a  Full Article…

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Design of Mat Foundations by Elastic Plate Method

Many methods are available for the design of mat-foundations. The one that is very much in use is the finite difference method. This method is based on the assumption that the subgrade can be substituted by a bed of uniformly distributed coil springs with a spring constant ks which is called the coefficient of subgrade  Full Article…

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Design of Mat Foundation by Rigid Method

In the conventional rigid method the mat is assumed to be infinitely rigid and the bearing pressure against the bottom of the mat follows a planar distribution where the centroid of the bearing pressure coincides with the line of action of the resultant force of all loads acting on the mat. The procedure of design  Full Article…

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Proportioning of Cantilever Footing

Strap or cantilever footings are designed on the basis of the following assumptions: 1 . The strap is infinitely stiff. It serves to transfer the column loads to the soil with equal and uniform soil pressure under both the footings. 2. The strap is a pure flexural member and does not take soil reaction. To avoid  Full Article…

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