Asce 7-05 Wind Load Mwfrs (Pipe Rack)

PAGE

Design Calculations for Bracket Bolts VESSEL No. V-220-004 Client:

Saipem

Company:

KOC

Cont. No.:

2 of 8

42906

Doc. No:

REV.

1

45.00 m/s C 17.73 m 22.36 m 8.53 m

= 162 kph

= 100.66 mph

Wind Speed SF = N=

As Per (Sec.6.5.6) Building total Height

8.53 m 2.0

Wind Dir.

Horizontal Bldg .Dim. Measured Normal to Wind Dir.

L=

V= Exposure: h= B= L= Kzt = Kd = Category:

8.53 m

1- Wind Load Parameters:

Horizontal Bldg .Dim. Measured Parallel to Wind Dir.

Fig. 6-4:

1.0

0.85

K zt = (1+K 1 .K 2 .K 3 ) 2

Eq.6-3

B= 22.36 m

For Buildings Table 6-4

1.15

I=

As Per Table 1-1

III

Importance Factor Table 6-1

2- Velocity Pressure Calculations: 2.1- Windward wall: z (m) 4.60

Kz * 0.85

q z ** (N/m2) 1031.357

274.32 m 9.50

zg = α=

6.10

0.90

1094.494

* Kz =

7.60

0.94

1146.345

** qz =

9.10

0.98

1190.651

Kh =

15.20

1.09

1326.448

qh =

30.50

1.27

1535.908

=

2.01 (z/zg)

From Table 6-2 From Table 6-2

2/α

: 4.6 < z < zg

0.613 Kz Kzt Kd V 2 I

Eq. 6-15 velocity Press.

2.01 (h /zg) 2/α =

2.01 X (17.73 / 274.32 )^(2/9.5) = 1.129 2

0.613 Kh Kzt Kd V I

Eq 6-15 Velocity Pressure

0.613 X 1.129 X 1 X 0.85 X (45^2) X1.15 =

2 1370.147 N/m

2.2- Leeward wall, Side Walls & Roof: q z = q h = 0.613 Kh Kzt Kd V 2 I

Eq. 6-15 2

1370.15 N/m

= 0.613 X 1.129 X 1 X 0.85 X (45^2) X1.15 = 3- Gust Effect Factor "G": z= Max of ( 0.6 h , zmin) = l = 152.4 Є= c= gQ = gv =

1/5.0 0.2 3.4 3.4

Lz =

l (z/10)Є =

Iz = Q=

c (10/z)1/6=

0.6 X 17.73 =

10.638

: zmin = 4.57

z Equivalent height of the structure

From Table 6-2

= 0.200

From Table 6-2 From Table 6-2

152.4 X (10.638 / 10 )^(1/5.0 ) =

154.30

Eq. 6-7 Integral length scale of turbulence@equivalent height

0.2 X (10 / 10.638 )^(1/6) =

0.198

Eq. 6-5 Intensity of turbulence@height z

1 = 1 + 0.63 ( (B+h )/Lz )0.63 0.925 X

1 1 +[ 0.63 X ( (22.36+17.73)/154.297 )^0.63] 1 + ( 1.7 X3.4 X 0.198 X 0.888 ) 1 + ( 1.7 X 3.4 X 0.198 )

= 0.940

= 0.888

Background Response Eq 6-6

Eq 6-4 Gust Effect Factor

PAGE

Design Calculations for Bracket Bolts VESSEL No. V-220-004 Client:

Saipem

Company:

KOC

Cont. No.:

2 of 8

42906

Doc. No:

REV.

4- Wind Pressure Coefficients: 4.1- Force Coefficient "C f ": h XB =

Ag =

17.73 X 22.36 = 396.44 m2 As =

Description

ɛ=

Section

As / Ag =

Weidth (mm) 400

25.65 / 396.443 =

SF / B = 8.53 / 22.36 = N= 2.0 Cf = CDg / ɛ =

Length (mm) 64125

0.06

25.65 As 25.65 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

using these Values throght the Graph CDg =

0.38 0.9 / 0.06 =

m2

0.9

13.91

Cf =

1.8

for All Structural Members Fig 6-22 Page 75

Cf =

0.7

for All Pipes Fig 6-21 Page 74

Cf =

2.0

for All Cable Trays Fig 6-21 Page 74

5- Design Wind Pressure : 5.1- Structural Items: P = q z GC f A e P = q z GC f Cf = 5.307 z (m) 4.60 6.10 7.60 9.10 15.20 30.50

q z (N/m2) 1031.357 1094.494 1146.345 1190.651 1326.448 1535.908

(N)

Eq. 6-28 Page 29

2

(N/m ) for Structural Items Equation P (N/m2) 1031.357 X 0.94 X 5.307 1094.494 X 0.94 X 5.307 1146.345 X 0.94 X 5.307 1190.651 X 0.94 X 5.307 1326.448 X 0.94 X 5.307 1535.908 X 0.94 X 5.307

P (N/m2) 5144.906 5459.867 5718.523 5939.541 6616.962 7661.850

1

PAGE

Design Calculations for Bracket Bolts VESSEL No. V-220-004 Client:

Saipem

Company:

KOC

Cont. No.:

Doc. No:

2 of 8

42906 REV.

5.2- Piping Items: P = q z GC f A e P = q z GC f =

(N)

(N/m 2 ) 1370.147 X 0.94 X 0.7 N/m2 901.54

=

N/m2

5.3- Cable Trays: P = q z GC f A e P = q z GC f = =

(N)

(N/m 2 )

1370.147 X 0.94 X 2 N/m2 2575.83

N/m2

5.4- Equipment: cf for Equipment to be calculated from Fig 6-21

1