determines that Site Classes E or F could be present at the site or in the event that Site Classes E or F
are established by geotechnical data.
Table 3-2a
Values of Fa as a Function of a Site Class and Mapped
Short-Period Spectral Response Acceleration Ss
Mapped Spectral Acceleration at Short Periods Ss
Site
Class
Ss = 0.50
Ss = 0.75
Ss = 1.00
Ss≤ 0.25
Ss ≥1.25
A
0.8
0.8
0.8
0.8
0.8
B
1.0
1.0
1.0
1.0
1.0
C
1.2
1.2
1.1
1.0
1.0
D
1.6
1.4
1.2
1.1
1.0
E
2.5
1.7
1.2
0.9
*
F
*
*
*
*
*
* Site-specific geotechnical investigation and dynamic site response analyses
should be performed.
Table 3-2b
Values of Fv as a Function of a Site Class and Mapped
Spectral Response Acceleration at One-Second Period S1
Mapped Spectral Acceleration at One-Second Period S1
Site
Class
S1 = 0.20
S1 = 0.30
S1 = 0.40
S1≤ 0.10
S1 ≥ 0.50
A
0.8
0.8
0.8
0.8
0.8
B
1.0
1.0
1.0
1.0
1.0
C
1.7
1.6
1.5
1.4
1.3
D
2.4
2.0
1.8
1.6
1.5
E
3.5
3.2
2.8
2.4
*
F
*
*
*
*
*
* Site-specific geotechnical investigation and dynamic site response analyses
should be performed
.
3-5
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