Answer / guest

Because as per codal provisions specified in IS456:2000,it is
mandatory to use 12mmdia bars.

Answer / r.mahendiran

As per IS 400 year 2000 min 12 mm dia to be used for column

Answer / ujjawal

Because slenderness ratio is a very imp Phenomenon in case
of column. and the ratio of minimum 12 mm fi bar is not
permit for buckling of column

Answer / siba

ANS:- TO Reduce buckling tendency . If we use < 12 mm dia bar and column length is high, than it may be buckle.

Answer / rfvz6s

as much i know i think less dia bars will require more stirrups so the column design will be uneconomical.

moreover since column is a vertical member the less dia bars will easily buckle as compared to 12mm when th equivalent length is quite high

Answer / biswa kalyan roy

Column is a compressive member. So to reduce the size of
cross-sectional we are in use of varies diametre as desire.

Answer / busireddyravi

as per my concern: we use Coarse aggregate minimum size is
12mm, thatswahy we use minimum 12mm dia bar in column (to
bare compression)

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