RCC Structures Design
A part of the slab may be considered as the flange of the T-beam if

Flange has adequate reinforcement transverse to beam
It is built integrally with the beam
All of the listed here
It is effectively bonded together with the beam

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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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