Calculate Center To Center Distance Between The Bars In Column – Beam And slab
Let us calculate the C / C distance between the reinforcement bars for the column section drawing as shown below.
Given data :
Column width = 480mm.
Column depth = 300mm.
Clear cover = 40mm.
Corner rebar diameter = 16mm.
Mid rebar diameter = 12mm.
No. of rebars = 10nos.
Stirrup bar diameter = 8mm.
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Now, we will find out the spacing of the bars in both directions, i.e. the value of x & y as shown in the drawing.
First, we will calculate y where,
y = [column width – {(2nos.× cover) +( 2nos.× dia. of stirrup bar ) +(2nos.×1/2 dia. of corner bar)}] ÷[ no. of bars in width side 1]
= [ 480mm – {( 2nos. × 40mm ) + ( 2nos. × 8mm ) + ( 2nos. × 1/2 × 16mm )}] ÷ [4 1]
= [ 480mm – { 80mm + 16mm + 16mm }] ÷ 3
= [ 480mm – 112mm ] ÷ 3
= 368mm ÷ 3
= 122.66mm.
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Bar Bending Schedule Of Plinth Beam
x = [column depth – {(2nos.× cover) +( 2nos.× dia. of stirrup bar ) +(2nos.×1/2 dia. of corner bar)}] ÷[ no. of bars in depth side 1]
= [ 300mm – {( 2nos. × 40mm ) + ( 2nos. × 8mm ) + ( 2nos. × 1/2 × 16mm )}] ÷ [3 1]
= [ 300mm – { 80mm + 16mm + 16mm }] ÷ 2
= [ 300mm – 112mm ] ÷ 2
= 188mm ÷ 2
= 94mm.
The centertocenter distance of bars in the column is y = 122.66mm. & x = 94mm.
Note:
1. By using this method, you can calculate the centertocenter distance between all types of structural members.
2. The centertocenter distance will be the same irrespective of the diameter of bars.
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