RCC Structures Design
The design of heel slab of a retaining wall is based on the maximum bending moment due to:

Weight of the soil above it
All listed here
Load of the surcharge, if any
Its own weight

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RCC Structures Design
In a singly reinforced beam

Steel possesses initial stresses when embedded in concrete
Plane sections transverse to the centre line of the beam before bending remain plane after bending
Compression is borne entirely by concrete
Elastic moduli for concrete and steel have different values within the limits of deformation of the beam

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