- Not less than – 1) diameter of bar
2) 6mm. more than
nominal
maximum size
of coars aggreataes
- Vertical distance between two horizontal reinforcement shall normally by 15mm. maximum size (coarse aggregate or maximum distance of bar whichever is greatest.
- Pitch of main tensile reinforcement in solid slab shall be not more than 3 x effective depth of slab or 600mm. whichever is smaller.
- Pitch of distribution bars shall not be more than 5 x effective depth or 600mm. whichever is smaller.
COVER
- At each end not less than 25mm. nor less than twice the dia. of bar
- For longitudinal reinforcement in column not less than 40mm. not less than the dia. of the bar
- For longitudinal reinforcement of beams not less than 25mm. not less than the dia. of bar
- For tensile compressive, shear reinforcement in slabs not less than 13mm. not less than the dia. of bar
LAPS IN BARS
The length of lap in
reinforcement shall not be less than
- For bars in tension : bar diameter
Actual tensile stress
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Five times the permissible average bond stress or 30 times the bar diameter, whichever is greater
- For bars in compression : bar diameter
Actual tensile stress
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Five times the permissible average bond stress or 24 times the bar diameter, whichever is greater
Properties
of : DEFORMED COLD TWISTED STEEL ROADS
|
Equivalent sections for
Tension Reinforcement
|
|
Mild steel mm. 8 10 12 16 20 22 25 28 32 36 40 50
|
|
Deformed cold twisted steel
mm. 6.25 8 10 12.5 16 18 20 22 25 28 32 38
|
|
Equivalent sections for
Compression Reinforcement
|
|
Mild steel mm 12 16 20 22 25 28 32 36 40 50
|
|
Deformed cold twisted steel
mm. 10 14 2x12 18 20 22 1x18 2x20 32 40
|
