Calculation Formula Of Column, Beam And Slab
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
