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

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

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RCC Structures Design
If the shear stress in a R.C.C. beam is

Greater than 20 kg/cm², the size of the section is changed
Greater than 4 kg/cm², but less than 20 kg/cm², shear reinforcement is provided
All of these
Equal or less than 5 kg/cm², no shear reinforcement is provided

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