circular slab bbs with complete bar calculation

To prepare circular slab bbs, we need to calculate cutting length of bar, No. of bars and its weight only along one direction as it is circular slab and for bars along other other direction the value will be same.

Cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

Weight = (d^2/162)*(CL/1000)

circular slab bbs (reinforcement plan)

diameter of slab (D) = 8000mm = 8m

radius (R) = 4000mm = 4m

clear cover (cc) = 25mm = 0.025m

bar diameter (d) = 20mm

spacing between bars = 150mm = 0.15m

Main Bars calculation

L0

cutting length = D-(2cc)

= 8000-(2*25) = 7950 mm

weight = (d^2/162)*(CL/1000)

= ((20^2/162)*7950)/1000 = 19.63 Kg

L1

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-150^2))-(2*25))*2 = 7894 mm

weight = (d^2/162)*(CL/1000)

= ((20^2/162)*7894)/1000 = 19.49 Kg

L2

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-300^2))-(2*25))*2 = 7877 mm

weight = (d^2/162)*(CL/1000)

= ((20^2/162)*7877)/1000 = 19.45 Kg

L3

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-450^2))-(2*25))*2 = 7849 mm

weight = ((20^2/162)*7849)/1000 = 19.38 Kg

L4

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-600^2))-(2*25))*2 = 7809 mm

weight = ((20^2/162)*7809)/1000 = 19.28 Kg

L5

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-750^2))-(2*25))*2 = 7758 mm

weight = ((20^2/162)*7758)/1000 = 19.16 Kg

L6

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-900^2))-(2*25))*2 = 7695 mm

weight = ((20^2/162)*7695)/1000 = 19 Kg

L7

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-1050^2))-(2*25))*2 = 7619 mm

weight = ((20^2/162)*7619)/1000 = 18.81 Kg

L8

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-1200^2))-(2*25))*2 = 7532 mm

weight = ((20^2/162)*7532)/1000 = 18.6 Kg

L9

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-1350^2))-(2*25))*2 = 7431 mm

weight = ((20^2/162)*7431)/1000 = 18.35 Kg

L10

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-1500^2))-(2*25))*2 = 7316 mm

weight = ((20^2/162)*7316)/1000 = 18.06 Kg

L11

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-1500^2))-(2*25))*2 = 7188 mm

weight = ((20^2/162)*7188)/1000 = 17.75 Kg

L12

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-1650^2))-(2*25))*2 = 7044 mm

weight = ((20^2/162)*7044)/1000 = 17.39 Kg

L13

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-1800^2))-(2*25))*2 = 6885 mm

weight = ((20^2/162)*6885)/1000 = 17 Kg

L14

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-1950^2))-(2*25))*2 = 6709 mm

weight = ((20^2/162)*6709)/1000 = 16.56 Kg

L15

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-2100^2))-(2*25))*2 = 6514 mm

weight = ((20^2/162)*6514)/1000 = 16.08 Kg

L16

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-2250^2))-(2*25))*2 = 6300 mm

weight = ((20^2/162)*6300)/1000 = 15.56 Kg

L17

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-2400^2))-(2*25))*2 = 6064 mm

weight = ((20^2/162)*6064)/1000 = 14.97 Kg

L18

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-2550^2))-(2*25))*2 = 5803 mm

weight = ((20^2/162)*5803)/1000 = 14.33 Kg

L19

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-2700^2))-(2*25))*2 = 5513 mm

weight = ((20^2/162)*5513)/1000 = 13.61 Kg

L20

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-2850^2))-(2*25))*2 = 5192 mm

weight = ((20^2/162)*5192)/1000 = 12.82 Kg

L21

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-3000^2))-(2*25))*2 = 4831 mm

weight = ((20^2/162)*4831)/1000 = 11.93 Kg

L22

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-3150^2))-(2*25))*2 = 4421 mm

weight = ((20^2/162)*4421)/1000 = 10.92 Kg

L23

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-3300^2))-(2*25))*2 = 3948 mm

weight = ((20^2/162)*3948)/1000 = 9.75 Kg

L24

cutting length = ((sqrt(R^2-spacing from centre^2))-(2cc))*2

= ((sqrt(4000^2-3450^2))-(2*25))*2 = 3387 mm

weight = ((20^2/162)*3387)/1000 = 8.36 Kg

L25

cutting length = ((sqrt(4000^2-3600^2))-(2*25))*2 = 2864 mm

weight = ((20^2/162)*2864)/1000 = 6.63 Kg

L26

cutting length = ((sqrt(4000^2-3750^2))-(2*25))*2 = 1678 mm

weight = ((20^2/162)*1678)/1000 = 4.14 Kg

Distribution Bars calculation

for distribution the cutting length, No. of bars & weight of bars will same as main bars because it is circular slab at both X & Y direction bar properties will be same.

Circular slab bbs Table

Sl. No.Bar dia (mm)Bar nameSpacing from centre (mm)Cutting length (mm)Weight (Kg)No. of barsTotal cutting length (mm)Total weighht(Kg)
120L00795019.6321590039.26
220L1150789419.4943157777.97
320L2300787719.4543151077.80
420L3450784919.3843139777.52
520L4600780919.2843123877.13
620L5750775819.1643103276.62
720L690076951943077976
820L71050761918.8143047875.25
920L81200753218.643012674.39
1020L91350743118.3542977273.39
1120L101500731618.0642626572.26
1220L111650718817.7542875170.99
1320L121800704417.3942817769.57
1420L13195068851742754068
1520L142100670916.5642683566.26
1620L152250651416.0842605864.34
1720L162400630015.5642520062.22
1820L172550606414.9742425459.89
1920L182700580314.3342321057.31
2020L192850551313.6142205454.45
2120L203000519212.8242076651.27
2220L213150483111.9341933247.71
2320L223300442110.9241768443.66
2420L23345039489.7541579439
2520L24360033878.3641354833.45
2620L25375026846.6341073626.51
2720L26390016784.144671116.57
Total1628.80

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