RCC Structures Design
The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm², safe shear stress 5 kg/cm² and B.M. 24 mt,

Needs redesigning
Is over safe in shear
Is safe in shear
Is unsafe in shear

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RCC Structures Design
If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight 'w' per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is

h = (W/Aw) [(1 - sin φ)/(1 + sin φ)]
h = (W/Aw) [(1 - sin φ)/(1 + sin φ)]²
h = (W/Aw) [(1 + sin φ)/(1 + sin φ)]
h = √(W/Aw) [(1 - sin φ)/(1 + sin φ)]²

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RCC Structures Design
In a singly reinforced beam

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

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