ANS:E - 60 cm

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.


In a simply supported slab the minimum spacing of distribution reinforcement, should not be more than five times the effective thickness of the slab or 600mm.

In a simply supported slab the minimum spacing of main reinforcement, should not be more than three times the effective thickness of the slab or 600mm.