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// CODE SNIPPET

1613.3.3 Site Coefficients and Adjusted Maximum Considered Earthquake Spectral Response Acceleration Parameters

Building Code 2015 of Utah > 16 Structural Design > 1613 Earthquake Loads > 1613.3 Seismic Ground Motion Values > 1613.3.3 Site Coefficients and Adjusted Maximum Considered Earthquake Spectral Response Acceleration Parameters
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The maximum considered earthquake spectral response acceleration for short periods, SMS, and at 1-second period, SM1, adjusted for site class effects shall be determined by Equations 16-37 and 16-38, respectively:




where:

Fa = Site coefficient defined in Table 1613.3.3(1).
Fv = Site coefficient defined in Table 1613.3.3(2).
SS = The mapped spectral accelerations for short periods as determined in Section 1613.3.1.
S1 = The mapped spectral accelerations for a 1-second period as determined in Section 1613.3.1.

TABLE 1613.3.3(1)
VALUES OF SITE COEFFICIENT Fa a
SITE CLASS MAPPED SPECTRAL RESPONSE ACCELERATION AT SHORT PERIOD
Ss ≤ 0.25 Ss = 0.50 Ss = 0.75 Ss = 1.00 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 0.9
F Note b Note b Note b Note b Note b
  1. Use straight-line interpolation for intermediate values of mapped spectral response acceleration at short period, Ss.
  2. Values shall be determined in accordance with Section 11.4.7 of ASCE 7.
TABLE 1613.3.3(2)
VALUES OF SITE COEFFICIENT FV a
SITE CLASS MAPPED SPECTRAL RESPONSE ACCELERATION AT 1-SECOND PERIOD
S1 ≤ 0.1 S1 = 0.2 S1 = 0.3 S1 = 0.4 S1 ≥ 0.5
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 2.4
F Note b Note b Note b Note b Note b
  1. Use straight-line interpolation for intermediate values of mapped spectral response acceleration at 1-second period, S1.
  2. Values shall be determined in accordance with Section 11.4.7 of ASCE 7.

Related Code Sections


1613.3.3 Structural Design, Site Coefficients and Adjusted Maximum Considered Earthquake Spectral Response Acceleration Parameters
The maximum considered earthquake spectral response acceleration for short periods, S MS , and at 1-second period, S M1 , adjusted for site ...
Building Code 2015 of Utah > 16 Structural Design > 1613 Earthquake Loads > 1613.3 Seismic Ground Motion Values > 1613.3.3 Site Coefficients and Adjusted Maximum Considered Earthquake Spectral Response Acceleration Parameters
1613.2.3 Structural Design, Site Coefficients and Adjusted Maximum Considered Earthquake Spectral Response Acceleration Parameters
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SPECTRAL RESPONSE ACCELERATION (5% OF CRITICAL DAMPING) FIGURE 1613.2.1(4) RISK-TARGETED MAXIMUM CONSIDERED EARTHQUAKE (MCE R ) GROUND MOTION ...
Building Code 2018 of Utah > 16 Structural Design > 1613 Earthquake Loads > 1613.2 Seismic Ground Motion Values > 1613.2.1 Mapped Acceleration Parameters
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Building Code 2018 of Utah > 16 Structural Design > 1603 Construction Documents > 1603.1 General > 1603.1.5 Earthquake Design Data
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