Civil Engineering - RCC Structures Design - Discussion

Concept:
According to IS: 456 (2000),

In a simply supported slab, the minimum spacing of distribution reinforcement should be:

Maximum of (4d, 60 cm)

Important Points:
Distribution steel is provided to distribute the load in a longitudinal direction.
It also takes care of shrinkage along the transverse direction and temperature effect.

Minimum spacing of distribution steel is governed by proper anchorage of reinforcement with concrete whereas maximum spacing is governed by the independent behavior of bars.


Note: Here, the question is asking for minimum spacing, not maximum spacing (5d, 45 cm).

It's only defined upon the length of the slab divided by 20.

For simply supported slab thickness L by 20.

Answer Should be 450mm.

Yes, right @Aryan.

It;s as pr 456:2000.

It's 5d or 45cm.

@Khan @Mukesh ogres.

Min thickness of slab 125mm.
As per IS 456:2000.
For distribution reinforcement min spacing 4d or 450mm whichever is less.

5d or 450 mm whichever is small.

I think it should be 30cm.

The minimum thickness of slab 125mm.

And spacing in case of distribution reinforcement 5d or 450mm whichever is less.