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Saturday, September 1, 2018

Concept of retaining wall designing

Retaining Wall: If it is required to provide support to an excavated area or a lower area of minimum 1 or 1.2 meters or more from a lifted section of the soil, a retaining wall should be set up there. This type of structure is suitable to withstand the lateral pressure resulting from the soil.

The retaining walls are generally constructed in the basement part of a building structure. While applying as integral to basement walls, they are frequently utilized as a support for floor diaphragm and a return wall that build them too rigid for active soil pressure to form necessary higher design loads and a dissimilar design approach.

The design of retaining wall is based on the following mode of failures:

Retaining Wall Mode of Failures

1. Overturning: The retaining wall under overturning failure easily collapses in bending.

2. Sliding: Retaining wall that collapses because of sliding often contain non-cohesive soils. The walls shift outer with a passive failure of soil ahead of foundation and active failure of soil back the wall. Many times a key is necessary under the foundation to stop sliding.

3. Bearing Check: Bearing check should be done because of the failure when the soil remains under the toe of the foundation and a forward rotation of the wall.

4. Overstress on any part of the Retaining Wall happens because of either bending or shear.

5. General Stability. It is a obstruction on slope failure, overall stability, and base stability.

Concept of forces in Retaining Walls: Exclusive of the self-weight, weight of soil and weight caused by the water it carries, the lateral soil pressure on the walls also requires to take into account.

The allocation of pressure P is similar to the area under the pressure distribution figure, and its line of action moves through the centroid of the pressure. While calculating earth pressure on walls, three common conditions of loading are usually taken into account.

2. Surcharge: A surcharge belongs to a Horizontal surface of fill that bears a uniformly distributed surplus load as a result of an adjoining neighbor or road traffic.

The pressure due to surcharge measured by transiting its load equivalent, an imaginary height of soil h’ over the top of the wall is stated as h=s/ɣ.

To get more detail, go through the following link thestructuralworld.com

Definition and categorisation of Pre-Stressed Concrete


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Published By
Rajib Dey
www.constructioncost.co
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