Calculation Formula Of Column, Beam And Slab

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Total length of 20 mm bar = 56.6 m
Total length of 16 mm bar = 171.35 m
Total length of 8 mm bar = 190.65 m
Weight of 20 mm bar = 56.6 x 2.469 = 139.74 k.g. (1 m bar = 2.469 k.g)
Weight of 16 mm bar = 171.35 x 1.58 = 270.73 k.g. (1 m bar = 1.58 k.g)
Weight of 8 mm bar = 190.65 x 0.395 = 75.30 k.g. (1 m bar = 2.469 k.g)

Calculation of Slab Steel

Spacing in slab bar c/c 150 mm
We have to use a main and cross 10 mm bar in the slab Before calculating.
Beam length from Grid-(L – M) is 7443 mm and Grid-(1 – 2) 5320 mm as given.
Width of the slab is 7443 that is the Width of two slabs for calculating S2 slab steel divide the width of 2 then we will get Width of S2 slab.
Width of slab S2 = 7443/2 = 3721.5 mm
Length of slab S2 = 5320 mm

we know that the main bar of slab laid in short span and crossbar laid in longer span.

No. Of riser required = 3600/160=22

Description	No.of Beam	Cutting Length in Meter	No. Bar	20 dia	16 dia	8 dia
Top main bar	1	20.95	4		83.8
Bottom main bar	1	20.95	2	41.9	41.9
Top Extra bar	1	2.9	3	8.7
		2.2	2		4.4
		2.75	2		5.5
		2.45	3		7.35
Bottom extra	1	4.945	2		9.89
		3.52	2		7.04
		3.735	2		7.47
Lap length (Top +Bottom)	1	1.0	6		4.0
	1	1.0	2	2.0
Ring (Grid 4-5)	1	1.55	51			79.05
Ring (Grid 4-5)		1.55	72			111.6
Total				52.6	171.35	190.65

First calculate the no. of bar = Length of span / spacing of bar + 1
Calculate the no. of bar of short span= 3721.5 / 150 +1 = 25.81 , approx = 26
Calculate the no. of bar of long span= 5320 / 150 +1 = 36.46 , approx = 36
Short span length = 3721.5 mm
Long span length = 5320 mm
Cutting length of short span = Length of span + Crank length – 45° bend
= 3721.5 + 0.42D – 2(1d)
D = Slab thickness – 2 side clear cover – dia of bar = 150 – 50 -10 = 90 mm
= 3721.5 + 0.42 x 90 – 2 x 1 x 10 = 3739 mm
No. of bar in short span = 26
Total cutting length = 26 x 3.739 = 97.21 m
Cutting length of Long span = 5320 + 0.42 x 90 – 2 x 1 x 10 = 5337.8 mm
No. of bar in long span = 36
Total cutting length = 36 x 5337.8 = 192.16 m
Weight of short span bar = 97.21 x 0.617 = 59.97 k.g. ( 0.617= 102/162 )
Weight of short span bar = 192.16 x 0.617 = 118.56 k.g.
We also can calculate the weig