RCC Structures Design
Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than

One diameter of thicker bar
Twice the diameter of thinner bar
None of these
One diameter of thinner bar

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RCC Structures Design
In a beam the local bond stress Sb, is equal to

Shear force/(Leaver arm × Total perimeter of reinforcement)
Leaver arm/(Shear force × Total perimeter of reinforcement)
Total perimeter of reinforcement/(Leaver arm × Shear force)
Leaver arm/(Bending moment × Total perimeter of reinforcement)

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