Answer Posted / prashant

it is depend upon the type of bar(like10mm bar,8mm bar)
SPACING=((area of one bar)*(width))/(area of rienforcement calculated)
where,
width=generally 1000mm,
area of reinforcement is calculated from design load,
and area of one bar is calculated from dai of bar which we havw taken(usually 10mm and 8mm fro slab)

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