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Page Title:
Table 2-2 Specified Damping Values |
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|  DOE-STD-1020-2002
Table 2-2 Specified Damping Values
Damping (% of critical)
Response
Response
Response
Type of Component
Level 1
Level 2
Level 3
Welded and friction bolted metal structures
2
4
7
Bearing-bolted metal structures
4
7
10
Prestressed concrete structures
2
5
7
(without complete loss of prestress)
Reinforced concrete structures
4
7
10
Masonry shear walls
4
7
12
Wood structures with nailed joints
5
10
15
Distribution systems***
3
5
5
Massive, low-stressed components
2
3
*
(pumps, motors, etc.)
Light welded instrument racks
2
3
*
Electrical cabinets and other equipment
3
4
5**
Liquid containing metal tanks
Impulsive mode
2
3
4
Sloshing mode
0.5
0.5
0.5
*
Should not be stressed to Response Level 3. Use damping for Response Level 2.
**
May be used for anchorage and structural failure modes which are accompanied by
at least some inelastic response. Response Level 1 damping values should be used
for functional failure modes such as relay chatter or relative displacement issues
which may occur at a low cabinet stress level.
*** Cable trays more than one half full of loose cables may use 10% of critical
damping.
2-16
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