Answer / vinod kumar, sriharikota

Dia of known bar d1=12 mm

spacing of known bar s1=150mm

d2=16mm , s2= ?

d1^2 / s1 = d2^2 /s2

s2 = (d2^2 x s1)/ (d1^2)

spacing of 16 mm bar =266.666 mm

Answer / sunil1505

dia 12 - 150
if 16 mm - 16*150/12


but after taking that spacing we should calculate the area
of steel in concrete..we should match the area of steel in
12 mm = area of steel 16 mm in that structure.

Answer / lohit havalagi

very simple when we increase the diameter of the reinforcing bar it results in increased area, so INCREASE the spacing to get the required area of steel.

Answer / mustafa mohd layeak

Consider 1m strip of slab.
Using 12mm dia bar with a spacing of 150mm,we get
Area of steel=754sqmm/m length.
So if using 16mm dia bar we get a new spacing
s=[(1000*201)/754].therefore new spacing
s=266 mmc/c. therefore use 16mm dia bar@250mmc/c.
But check [M/V + L']>dev length at support.

Answer / vijay

We can change the 12mm dia @150mm c/c spacing to 16mm dia @
150mm c/c but area of steel provided will get increased.

Answer / er.pramod k saroj

before D1=12 and s1=150 so change dia = D2=16. and spacing =S2= ? solve = S1xD2/D1. 150x16=2400/12=200mm. ans= 200 mm

Answer / daniel lemma

Let assume for 1m (1000mm) span
d1=12mm
s1=150 approx No. =8pcs

d2=16mm
s1=? approx No. =?
We have to use this formula
d1^2 / s1 = d2^2 /s2 So s2=266.66 and
approx Spacing 250mm, and
New approx No of bar will be 4pcs

Answer / sumit

Suppose known spacing (S1) for Dia (D1)
Define Spacing (S2) for Dia (D2)

So : S2=S1*D2/D1

Then u get answer

Answer / kunal chandra singh

We can calculate the weight of 12 mm rebar in 1 sq m area with 150 mm spacing after that we can calculate by compairing 16 mm dia with calculated weight per sq m area to calculate unknown spacing .

Answer / er. ritesh singh

Suppose d1-12 mm bar & d2-16mm bar than area of d2*150 /area of d2 bar

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