Enhanced Fujita scale damage indicators and degrees of damage, chapter 30

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C-5 Farm Silos or Grain Bins (C-FSGB)

Typical Construction:

Farm silos

Cylindrical structures typically 4-10 m in diameter and 20-50 m in height
Construction is wood staves, concrete staves, cast concrete, poured concrete or steel panels
With cast/poured concrete and Harvestore steel silos, increase toward upper-bound wind speed

Grain bins

Cylindrical structures typically 5-20 m in diameter and 5-30 m in height
Construction is galvanized steel panels and purlins

Table 30. Degree of Damage (DOD) for Expected (EXP), Lower Bound (LB) and Upper Bound (UB)
DOD	Damage Description	EXP*	LB*	UB*
1	Empty unanchored grain bin toppled; anchored grain bin damaged; silo cap damaged	90	70	110
2	Empty unanchored grain bin rolled or carried through air less than 10 m; anchored grain bin toppled; silo cap removed	135	110	160
3	Anchored grain bin rolled or carried less than 10 m; empty portions of silo destroyed	180	150	210
4	Grain bin carried 10-100 m or more; silo destroyed	225	190	260

*All wind speeds in km/h

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Date modified:: 2014-05-07