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Anchor Bolt Chairs - Calculation

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(1)

INPUT

Entered Parameters

Actual Bolt Root Area

Minimum Yield Strength

Product Design Stress

Nominal Radius to Tank Centerline (r) :

Shell Course (t-shell-1)

Repad Thickness (Repad-t)

Top Plate Width (a):

Top Plate Length (b) :

Vertical Plate Width (k) :

Top Plate Thickness (c) :

Bolt Eccentricity (e) :

Outside of Top Plate to Hole Edge (f) :

Distance Between Vertical Plates (g) :

Chair Height (h) :

Vertical Plates Thickness (j) :

Bottom Plate thickness (m) :

Shell Course + Repad Thickness (t) :

Design Load per Bolt (P)

Bolt Yield Load = A-s * Sy

Seismic Design Bolt Load (Pa)

1.5*P

min-P

VALUES LIMITS

e-min = 0.886 * d + 0.572

g-min = d + 1

f-min = d/2 + 1/8

c-min = SQRT[(P / (Sd-Chair * f) ) * (0.375 * g - 0.22 * d)]

b-min = e-min + d + 0.25

S-actual-Top-Plate = P / (f * c^2) * (0.375 * g - 0.22 * d)

Minimum Clearance of Repad from Anchor chair

Minimum Height = h + ClearX

Minimum Width = a + 2 * ClearX

Reduction Factor

Shell Stress due to Chair Height (For discrete Top Plate)

Bolt Diameter (d) = 36 mm (M36)

Threads per unit length (n) = 0.25

h-max = 3 * a

(2)
(3)

INPUT

SI

d

1.42 in

n

0.250

-A-s

9.57 in2

Sy

36.00 ksi

Sd-Chair

23.21 ksi

r

240.13 in

t-shell-1

0.25 in

Repad-t

0.63 in

a

7.87 in

b

7.87 in

k

5.41 in

c

1.50 in

S

4.09 in

f

2.80 in

g

3.94 in

h

15.75 in

j

0.63 in

m

0.38 in

t

0.88 in

42.17 kips

P

344.41 kips

77.99 kips

63.26 kips

MIN(P)

63.26 kips

VALUES LIMITS

23.62 in

1.83 in

2.42 in

0.83 in

1.07 in

0.57 in

3.50 in

11.77 ksi

ClearX=MAX(2, 0.25* Repad-t, 0.25 * t-shell-1)

3.78 in

19.53 in

15.43 in

z = 1 / (F4 * F5 + 1)

0.994 in

S-actual-ChairHeight = P * (e / t^2) * F3

13.98 ksi

F1 = (1.32 * z) / (F6 + F7)

0.0397

F2 = 0.031 / SQRT(r * t)

0.002133

(4)

F6 = (1.43 * a * h^2) / (r * t)

13.22

F7 = (4 * a * h^2)^(1/3)

19.84

S-actual-Top-Plate/Sd-Chair

50.74%

(5)

36.00

0.250

759.28

248.21

160.00

6,099.18 mm

6.35 mm

16.00 mm

200.00 mm

200.00 mm

137.50 mm

38.00 mm

104.00 mm

71.00 mm

100.00 mm

400.00 mm

16.00 mm

9.53 mm

22.35

mm

187,590.00

188,461.59

346,932.00

281,385.00

188,461.59

600.00 mm

46.42 mm

61.40 mm

21.18 mm

27.07 mm

14.48 mm

88.77 mm

81.19

MPa

96.00 mm

496.00 mm

392.00 mm

25.23 mm

(6)
(7)

INPUT

Entered Parameters SI

d

36.00 mm

n

0.250

-Actual Bolt Root Area A-s

759.28 mm2

Minimum Yield Strength

Sy

248.21 MPa

Product Design Stress

Sd-Chair

160.00 MPa

Nominal Radius to Tank Centerline (r) :

r

6,099.18 mm

Shell Course (t-shell-1)

t-shell-1

6.35 mm

Repad Thickness (Repad-t)

Repad-t

16.00 mm

Top Plate Width (a):

a

200.00 mm

Top Plate Length (b) :

b

200.00 mm

Vertical Plate Width (k) :

k

137.50 mm

Top Plate Thickness (c) :

c

25.00 mm

Bolt Eccentricity (e) :

S

104.00 mm

Outside of Top Plate to Hole Edge (f) :

f

71.00 mm

Distance Between Vertical Plates (g) :

g

100.00 mm

Chair Height (h) :

h

400.00 mm

Vertical Plates Thickness (j) :

j

16.00 mm

Bottom Plate thickness (m) :

m

9.53 mm

Re Pad To Side Plate Offset

x1

144.00 mm

Re Pad To Top Plate Offset

y1

120.00 mm

Width of Re Pad

X

420.00 mm

Height of Re Pad

Y

520.00 mm

Shell Course + Repad Thickness (t) :

t

22.35 mm

Design Load per Bolt (P)

187,590.00 N

Bolt Yield Load = A-s * Sy

P

188,461.59 N

Seismic Design Bolt Load (Pa)

346,932.00 N

1.5*P

281,385.00 N

min-P

MIN(P)

188,461.59 N

VALUES LIMITS

600.00 mm

e-min = 0.886 * d + 14.52

46.42 mm

g-min = d + 25.4

61.40 mm

f-min = d/2 + 4

21.18 mm

c-min = SQRT[(P / (Sd-Chair * f) ) * (0.375 * g - 0.22 * d)]

22.15 mm

15.00 mm

b-min = e-min + d + 6.35

88.77 mm

S-actual-Top-Plate = P / (f * c^2) * (0.375 * g - 0.22 * d)

125.63 MPa

96.00 mm

Minimum Height = h + ClearX

496.00 mm

Minimum Width = a + 2 * ClearX

392.00 mm

Reduction Factor, z = 25.4 / (F4 * F5 + 25.4)

0.994 mm

64.58 MPa

F1 = (1.32 * z) / (F6 + F7)

0.0016

F2 = 0.031 / SQRT(r * t)

0.000084

F3 = F1 + F2

0.0016

F4 = (0.177 * a * m) / SQRT(r * t)

0.914

F5 = (m / t)^2

0.182

F6 = (1.43 * a * h^2) / (r * t)

335.69

F7 = (4 * a * h^2)^(1/3)

503.97

S-actual-Top-Plate/Sd-Chair

78.52%

S-actual-ChairHeight/Sd-ChairHeight

40.36%

Bolt Diameter (d) = 36 mm (M36) Threads per unit length (n) = 0.25

h-max = 3 * a

j-min = MAX(13, [0.04 * (h - c)])

Minimum Clearance of Repad from Anchor chair

ClearX=MAX(50.8, 6.35 * Repad-t, 6.35 * t-shell-1)

Shell Stress due to Chair Height (For discrete Top Plate)

S-actual-ChairHeight = P * (e / t^2) * F3

(8)

Actual Bolt Root Area A-s 324.16 mm2

Minimum Yield Strength Sy 248.21 MPa

Product Design Stress Sd-Chair 160.00 MPa

Nominal Radius to Tank Centerline (r) : r 2,034.00 mm

Shell Course (t-shell-1) t-shell-1 6.35 mm

Repad Thickness (Repad-t) Repad-t 16.00 mm

Top Plate Width (a): a 200.00 mm

Top Plate Length (b) : b 200.00 mm

Vertical Plate Width (k) : k 137.50 mm

Top Plate Thickness (c) : c 38.00 mm

Bolt Eccentricity (e) : S 102.00 mm

Outside of Top Plate to Hole Edge (f) : f 32.00 mm

Distance Between Vertical Plates (g) : g 108.00 mm

Chair Height (h) : h 400.00 mm

Vertical Plates Thickness (j) : j 16.00 mm

Bottom Plate thickness (m) : m 9.53 mm 52,929,974.85

Re Pad To Side Plate Offset x1 150.00 mm 572.140701345

Re Pad To Top Plate Offset y1 150.00 mm

Width of Re Pad X 440.00 mm

Height of Re Pad Y 550.00 mm

Shell Course + Repad Thickness (t) : t 22.35 mm

Design Load per Bolt (P) 15,000,000.00 N

Bolt Yield Load = A-s * Sy

P

80,459.04 N

Seismic Design Bolt Load (Pa) 346,932.00 N

1.5*P 22,500,000.00 N min-P MIN(P) 80,459.04 N VALUES LIMITS 600.00 mm e-min = 0.886 * d + 14.52 35.78 mm g-min = d + 25.4 49.40 mm f-min = d/2 + 4 15.18 mm c-min = SQRT[(P / (Sd-Chair * f) ) * (0.375 * g - 0.22 * d)] 23.53 mm 14.48 mm b-min = e-min + d + 6.35 66.13 mm S-actual-Top-Plate = P / (f * c^2) * (0.375 * g - 0.22 * d) 61.33 MPa 96.00 mm

Minimum Height = h + ClearX 496.00 mm

Minimum Width = a + 2 * ClearX 392.00 mm

Reduction Factor, z = 25.4 / (F4 * F5 + 25.4) 0.989 mm 16.58 MPa F1 = (1.32 * z) / (F6 + F7) 0.0009 F2 = 0.031 / SQRT(r * t) 0.000145 F3 = F1 + F2 0.0010 F4 = (0.177 * a * m) / SQRT(r * t) 1.582 F5 = (m / t)^2 0.182 F6 = (1.43 * a * h^2) / (r * t) 1,006.60 F7 = (4 * a * h^2)^(1/3) 503.97 S-actual-Top-Plate/Sd-Chair 38.33% S-actual-ChairHeight/Sd-ChairHeight 10.37% h-max = 3 * a j-min = MAX(13, [0.04 * (h - c)])

Minimum Clearance of Repad from Anchor chair ClearX=MAX(50.8, 6.35 * Repad-t, 6.35 * t-shell-1)

Shell Stress due to Chair Height (For discrete Top Plate) S-actual-ChairHeight = P * (e / t^2) * F3

References

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