RCC Structures Design
The toe projection of foundation slabs is taken

Equal to heel slab
As one third of the base
As one sixth of overall height of the wall
Below ground surface

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RCC Structures Design
Pick up the assumption for the design of a pre-stressed concrete member from the following:

All listed here
A transverse plane section remains a plane after bending
Variation of stress in reinforcement due to changes in external loading is negligible
During deformation limits, Hook's law is equally applicable to concrete as well as to steel

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RCC Structures Design
If p₁ and p₂ are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p₁, is:

[(p₁ + p₂)/2] + [(p₁ - p₂)/2] sin 2θ
[(p₁ + p₂)/2] + [(p₁ - p₂)/2] cos 2θ
[(p₁ - p₂)/2] + [(p₁ + p₂)/2] cos 2θ
[(p₁ - p₂)/2] + [(p₁ + p₂)/2] sin 2θ

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