121.
If p1 and p2 are effective lateral loadings at the bottom and top exerted by a level earth subjected to a super-load on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is

122.
To ensure uniform pressure distribution, the thickness of the foundation, is

124.
Steel beam theory is used for

129.
If longitudinally spanning stairs are casted along with their landings, the maximum bending moment per metre width, is taken as

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