raft thickness

8/11/2019 Raft Thickness

1/6

PROJECT:-

BUILDING:-

REVISION NO.:-

LOCATION

Node

No.

Shorter

dimension

of Column

Longer

dimension

of Column

Axial Forceon Column

for 1.5( DL +

Reduced LL)

Ks Ks final

Total

Thickness

Of Footing

Effective

Thickness Of

Raft

Punching

Area

Actual

Punching

Stress

Grade Of

Concrete

Permissible

Shear Stress

Thickness

Check

No. B (mm) L (mm) FY (kN) Ks Ks final Depth

(D)

Eff. Depth

(d)

A (mm2) Fy/A Fck Ks*.25*root

Fck

Check

15 450 1250 11500.00 0.86 0.86 1350 1290 11042400 1.041 M25 1.075 Safe

16 300 850 3214.59 0.85 0.85 1200 1140 7820400 0.411 M25 1.07 Safe

17 300 850 3192.38 0.85 0.85 1000 940 5696400 0.560 M25 1.07 Safe

18 300 1000 4250.52 0.80 0.80 1000 940 5978400 0.711 M25 1.00 Safe

19 300 1000 3664.63 0.80 0.80 1000 940 5978400 0.613 M25 1.00 Safe

20 300 1000 3934.13 0.80 0.80 1000 940 5978400 0.658 M25 1.00 Safe

21 300 1000 3986.11 0.80 0.80 1000 940 5978400 0.667 M25 1.00 Safe

22 300 1000 3571.48 0.80 0.80 1000 940 5978400 0.597 M25 1.00 Safe

25 300 850 4921.91 0.85 0.85 1000 940 5696400 0.864 M25 1.07 Safe

26 400 1000 5915.14 0.90 0.90 1000 940 6166400 0.959 M25 1.13 Safe

27 400 1000 5895.45 0.90 0.90 1000 940 6166400 0.956 M25 1.13 Safe

28 300 850 4934.12 0.85 0.85 1000 940 5696400 0.866 M25 1.07 Safe

29 300 1000 3455.16 0.80 0.80 1000 940 5978400 0.578 M25 1.00 Safe

30 300 1000 3953.59 0.80 0.80 1000 940 5978400 0.661 M25 1.00 Safe

31 300 1000 3970.21 0.80 0.80 1000 940 5978400 0.664 M25 1.00 Safe

32 300 1000 3356.74 0.80 0.80 1000 940 5978400 0.561 M25 1.00 Safe

33 300 1000 4198.95 0.80 0.80 1000 940 5978400 0.702 M25 1.00 Safe

34 300 850 3483.62 0.85 0.85 1000 940 5696400 0.612 M25 1.07 Safe

35 300 850 3478.06 0.85 0.85 1000 940 5696400 0.611 M25 1.07 Safe

36 300 1000 4193.14 0.80 0.80 1000 940 5978400 0.701 M25 1.00 Safe

37 300 1200 5218.74 0.75 0.75 1000 940 6354400 0.821 M25 0.94 Safe38 300 1200 5074.08 0.75 0.75 1000 940 6354400 0.799 M25 0.94 Safe

41 300 850 3421.27 0.85 0.85 1000 940 5696400 0.601 M25 1.07 Safe

42 300 1200 4161.82 0.75 0.75 1000 940 6354400 0.655 M25 0.94 Safe

43 300 1200 4168.56 0.75 0.75 1000 940 6354400 0.656 M25 0.94 Safe

44 300 850 3489.12 0.85 0.85 1000 940 5696400 0.613 M25 1.07 Safe

45 300 850 2612.61 0.85 0.85 1000 940 5696400 0.459 M25 1.07 Safe

46 300 850 2506.83 0.85 0.85 1000 940 5696400 0.440 M25 1.07 Safe

47 300 1200 3575.90 0.75 0.75 1000 940 6354400 0.563 M25 0.94 Safe

48 300 850 3045.92 0.85 0.85 1000 940 5696400 0.535 M25 1.07 Safe

49 300 850 2882.73 0.85 0.85 1000 940 5696400 0.506 M25 1.07 Safe

50 300 1200 3426.96 0.75 0.75 1000 940 6354400 0.539 M25 0.94 Safe

51 230 750 2107.62 0.81 0.81 1000 940 5376800 0.392 M25 1.01 Safe

52 300 850 3742.27 0.85 0.85 1000 940 5696400 0.657 M25 1.07 Safe53 230 750 2859.98 0.81 0.81 1000 940 5376800 0.532 M25 1.01 Safe

54 300 750 3780.97 0.90 0.90 1000 940 5508400 0.686 M25 1.13 Safe

55 300 750 3883.16 0.90 0.90 1000 940 5508400 0.705 M25 1.13 Safe

56 300 850 3757.35 0.85 0.85 1000 940 5696400 0.660 M25 1.07 Safe

57 300 850 4206.26 0.85 0.85 1000 940 5696400 0.738 M25 1.07 Safe

62 230 750 2676.76 0.81 0.81 1000 940 5376800 0.498 M25 1.01 Safe

63 230 750 2717.47 0.81 0.81 1000 940 5376800 0.505 M25 1.01 Safe

64 300 750 3570.50 0.90 0.90 1000 940 5508400 0.648 M25 1.13 Safe

65 300 850 4420.32 0.85 0.85 1000 940 5696400 0.776 M25 1.07 Safe

66 300 750 3311.45 0.90 0.90 1000 940 5508400 0.601 M25 1.13 Safe

67 300 750 3279.49 0.90 0.90 1000 940 5508400 0.595 M25 1.13 Safe

68 300 750 3700.62 0.90 0.90 1000 940 5508400 0.672 M25 1.13 Safe

69 300 1200 3549.58 0.75 0.75 1000 940 6354400 0.559 M25 0.94 Safe70 300 850 2900.64 0.85 0.85 1000 940 5696400 0.509 M25 1.07 Safe

71 300 850 2892.08 0.85 0.85 1000 940 5696400 0.508 M25 1.07 Safe

72 500 1200 3487.02 0.92 0.92 1000 940 6730400 0.518 M25 1.15 Safe

73 300 850 2637.72 0.85 0.85 1000 940 5696400 0.463 M25 1.07 Safe

74 300 850 2515.76 0.85 0.85 1000 940 5696400 0.442 M25 1.07 Safe

77 300 850 3406.23 0.85 0.85 1000 940 5696400 0.598 M25 1.07 Safe

78 300 1200 4193.27 0.75 0.75 1000 940 6354400 0.660 M25 0.94 Safe

79 300 1200 4176.55 0.75 0.75 1000 940 6354400 0.657 M25 0.94 Safe

80 300 850 3500.52 0.85 0.85 1000 940 5696400 0.615 M25 1.07 Safe

81 300 1200 5234.91 0.75 0.75 1000 940 6354400 0.824 M25 0.94 Safe

82 300 1200 5004.84 0.75 0.75 1000 940 6354400 0.788 M25 0.94 Safe

83 300 1000 4203.89 0.80 0.80 1000 940 5978400 0.703 M25 1.00 Safe

PUNCHING SHEAR CHECK FOR RAFT THICKNESS CALCULATIONS


2/6

84 300 850 3483.36 0.85 0.85 1000 940 5696400 0.612 M25 1.07 Safe

85 300 850 3480.02 0.85 0.85 1000 940 5696400 0.611 M25 1.07 Safe

86 300 1000 4236.89 0.80 0.80 1000 940 5978400 0.709 M25 1.00 Safe


3/6

Projection

Shorterdimension

of Pedestal

Longerdimension

of Pedestal

Thickness of

Pedestal Ks Ks final

Total

ThicknessOf

uniform

Raft

EffectiveThickness Of

uniform Raft

Punching

Area

ActualPunching

Stress

Grade Of

Concrete

Permissible

Shear Stress

Thickness

Check

Projection Bp (mm) Lp (mm) (mm) Ks Ks final Depth

(D1)

Eff. Depth

(d)

A (mm2) Fy/A Fck Ks*.25*root

Fck

Check

645 1740 2540 350 1.19 1.00 1000 940 11580800 0.993 M25 1.250 Safe

570 1440 1990 200 1.22 1.00 1000 940 9982800 0.322 M25 1.250 Safe

NA NA NA 0 NA NA 1000 NA NA NA M25 NA NA





NA NA NA 0 NA NA 1000 NA NA NA M25 NANA



























NA NA NA 0 NA NA 1000 NA NA NA M25 NA NANA NA NA 0 NA NA 1000 NA NA NA M25 NA NA
























CHECK FOR PEDESTAL SIZE IF REQUIRED


4/6





5/6


6/6

Not reqd.

Not reqd.

Not reqd.

raft thickness

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