Answer Posted / mustafa mohammed layeak

Area of 8mm dia bar = 50.28 sqmm .
Area of 10mm dia bar= 78.57 sqmm .
For example if you don't have 8mm dia bar available to use
in 1m strip of slab,then one can use 10mm dia bar with an
increased spacing relative to 8mm dia bar.And reqired area
of steel in 1m wide strip is 452 sqmm/m length (Ast/m
length). the calculation is as follows
Using 8mm dia bar we get spacing in 1m wide strip as
s=[(b*Abar)/Ast] therefore s=[(1000*50.28)/452]. Therefore
required spacing with 8mm dia bars= 111 mm c/c.
similarly the required spacing using 10mm dia bars will be
spacing = [(1000*78.57)/452]. Therefore required spacing
using 10mm dia bars = 173mm c/c in 1m wide strip length.

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