Mettler Toledo LJ16 Spécifications télécharger pdf (Page 34)

Chapter 4: Environmental Considerations

Wind Loading

(12/99) 4-3

Example

In the following example, we will calculate wind loading for a tank supported by four

weigh modules and located on the coastline at Tampa, Florida. The wind force code

used for this example is the

Ohio Basic Building Code

(BOCA). Always use the

appropriate building code for your area to determine the equivalent wind force.

The installation has the following characteristics:

= 30,000 pounds

= 5,000 pounds

= 8 feet

= 4 feet

= 20 feet

= 4

= 1.25

To size weigh modules for this tank (assuming no wind force), multiply the gross weight

of the full tank by a safety factor of 1.25:

30,000 × 1.25 = 37,500

Then divide by the number of weigh modules to be used:

37,500 ÷ 4 = 9,375 pounds per load cell

To support 9,375 pounds, you would need a 10,000-pound weigh module. So without

wind loading, the tank scale would use four 10,000-pound weigh modules.

Now calculate the wind force, using the following equation from the

Ohio Basic Building

Code

(BOCA):

F = P

× I × K

× G

× C

× A

where:

= 25.6 lb/ft

(V=100 mph); Basic Velocity Pressure [BOCA Table 1611.7(3)]

= 1.10 (at hurricane oceanline); Importance Factor [BOCA Table 1611.5]

= 1.31 (Exposure Category D); Exposure Coefficient [BOCA Table 1611.7(4)]

= 1.13 (Exposure Category D); Gust Response Factor [BOCA Table 1611.7(5)]

= 0.74 [Table 16.11(4)]; Force Coefficient [BOCA Table 1611.9(1-5)]

= 160 ft

(20 ft × 8 ft); Projected Area (normal to wind)

Calculation:

F = 25.6 × 1.10 × 1.31 × 1.13 × 0.74 × 160 = 4,936

The maximum shear force exerted by the wind would be 4,936 pounds at the tank’s

center of gravity (see Figure 4-3).

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