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Page Title:
Table D-2 Ratio of Hazard Probabilities to Performance Goal Probabilities |
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|  DOE-STD-1020-2002
Table D-2 Ratio of Hazard Probabilities to Performance Goal Probabilities
Performance
Ratio of Hazard to
Category
Performance Goals
Hazard Probability
Performance Probability
Straight Winds
1
20
10-3
2x10-2
2
20
5x10-4
10-2(1)
3
10
10-4
10-3
4
10
10-5
10-4
Tornadoes
3
1/5
10-4
2x10-5
4
1/5
10-5
2x10-6
Table D-3 Recommended Tornado Load Combinations
for Performance Categories 3 and 4
[
]
10
.
D + Wt
16
.
[
]
1 33
.
0.75 (D + L + Lr + W t )
ASD
1.6
15
.
[
]
0.66 (D + L + Lr + W t + T )
16
.
D + Wt
D + L + Lr + Wt
SD
D + L + Lr + Wt + T
AS
= Allowable Strength Design
Lr
= Roof live load
D
Use allowable stress appropriate for
building material
SD
= Strength Design
= Straight wind load
W
Use r factors appropriate for building
material
Wt = Tornado load, including APC if
D
= Dead load
appropriate
L
= Live load
T
= Temperature load
The 1.6 denominator represents the factor of safety for material allowable stress,
effectively removing this unneeded conservatism. The 1.33 and 1.5 factors negate the 0.75 and
0.66 factors permitted in ASD.
D-5
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