Mettler Toledo LJ16 Spécifications télécharger pdf (Page 36)

Chapter 4: Environmental Considerations

Seismic Loading

(12/99) 4-5

Seismic Loading

Seismic forces, movement caused by earthquakes and other shifts of the earth, are

among the strongest external forces that can affect a tank scale. Figure 4-4 shows

seismic potential for the United States, with seismic zone 0 being the least likely location

for an earthquake and seismic zone 4 the most likely location for an earthquake.

Seismic forces are analyzed in much the same way as wind forces. An equivalent

horizontal shear force (

) is determined by using the appropriate formulas from the

governing building code. Formulas referenced in this section are from the

1988 Uniform

Building Code

(UBC) as adopted by the State of California, a state with a high risk of

seismic activity.

Figure 4-4: Seismic Zones in the United States

UBC Code Formulas

The following UBC Code formulas are used to determine horizontal shear force (

) for

free-standing tanks and for tanks that are part of a structure:

V = (ZIC/R

)W = F

for free-standing tanks

= (ZIC

)W = F

for tanks that are part of a structure

where:

= Base Shear

= Periodic Force

= Seismic Zone Factor

Zone 4: 0.40

Zone 3: 0.30

Zone 2B: 0.20

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Mettler Toledo LJ16 Spécifications Page 36