// CODE SNIPPET
1613.5.3 Site Coefficients and Risk-Targeted Maximum Considered Earthquake (MCER) Spectral Response Acceleration Parameters
JUMP TO FULL CODE CHAPTER
The MCER spectral response acceleration parameters for short periods, SMS, and at 1-second period, SM1, adjusted for site class effects shall be determined by Equations 16-47 and 16-48, respectively:
where:
TABLE 1613.5.3(1) VALUES OF SITE COEFFICIENT Fa AS A FUNCTION OF SITE CLASS AND MAPPED SPECTRAL RESPONSE ACCELERATION AT SHORT PERIODS (SS)a
TABLE 1613.5.3(2) VALUES OF SITE COEFFICIENT Fv AS A FUNCTION OF SITE CLASS AND MAPPED SPECTRAL RESPONSE ACCELERATION AT 1-SECOND PERIOD (S1)a
where:
| Fa | = | Site coefficient defined in Table 1613.5.3(1). |
| Fv | = | Site coefficient defined in Table 1613.5.3(2). |
| SS | = | The mapped MCER spectral accelerations for short periods as determined in Section 1613.5.1. |
| S1 | = | The mapped MCER spectral accelerations for a 1-second period as determined in Section 1613.5.1. |
TABLE 1613.5.3(1) VALUES OF SITE COEFFICIENT Fa AS A FUNCTION OF SITE CLASS AND MAPPED SPECTRAL RESPONSE ACCELERATION AT SHORT PERIODS (SS)a
| SITE CLASS | Fa |
| A | 0.80 |
| B | 1.00 |
| C | 1.20 |
| D | 1.57 |
| E | 2. 37 |
| F | Note a |
a. Site-specific geotechnical investigation and dynamic site response analyses shall be performed to determine appropriate values, except that for structures with periods of vibration equal or less than 0.5 second, values of Fa for liquefiable soils are permitted to be taken equal to the values for the site class determined without regard to liquefaction in Section 1613.5.5.
TABLE 1613.5.3(2) VALUES OF SITE COEFFICIENT Fv AS A FUNCTION OF SITE CLASS AND MAPPED SPECTRAL RESPONSE ACCELERATION AT 1-SECOND PERIOD (S1)a
| SITE CLASS | Fv |
| A | 0.80 |
| B | 1.00 |
| C | 1.70 |
| D | 2.40 |
| E | 3.50 |
| F | Note a |
a. Site-specific geotechnical investigation and dynamic site response analyses shall be performed to determine appropriate values, except that for structures with periods of vibration equal or less than 0.5 second, values of Fv for liquefiable soils are permitted to be taken equal to the values for the site class determined without regard to liquefaction in Section 1613.5.5.
Related Code Sections
1613.5.3 Structural Design, Site Coefficients and Risk-Targeted Maximum Considered Earthquake (MCER) Spectral Response Acceleration Parameters
The MCE R spectral response acceleration parameters for short periods, S MS , and at 1-second period, S M1 , adjusted for site class effects ...
NYC Building Code 2014 > 16 Structural Design > 1613 Earthquake Loads > 1613.5 Seismic Ground Motion Values > 1613.5.3 Site Coefficients and Risk-Targeted Maximum Considered Earthquake (MCER) Spectral Response Acceleration Parameters
1615.2 Structural Design, Site-Specific Procedure for Determining Ground Motion Accelerations
by an acceleration response spectrum having a 2-percent probability of exceedance within a 50-year period. The maximum considered earthquake spectral ...
NYC Building Code 2008 > 16 Structural Design > 1615 Earthquake Loads — Site Ground Motion > 1615.2 Site-Specific Procedure for Determining Ground Motion Accelerations
1613.5.1 Structural Design, Mapped Acceleration Parameters
The mapped maximum considered earthquake spectral response acceleration at short periods ( S S ) shall be 0.281 g and at 1-second period ( S 1 ...
NYC Building Code 2014 > 16 Structural Design > 1613 Earthquake Loads > 1613.5 Seismic Ground Motion Values > 1613.5.1 Mapped Acceleration Parameters
Section 1615 Structural Design, Earthquake Loads — Site Ground Motion
be determined in accordance with Section 1615.1.1. The maximum considered earthquake spectral response accelerations at short period and 1-second ...
1813.2 Soils and Foundations, Site-Specific Analyses
1813.2.1 VALUES OF MAXIMUM CONSIDERED EARTHQUAKE GEOMETRIC MEAN (MCE G ) PEAK GROUND ACCELERATIONS ADJUSTED FOR SITE CLASS EFFECTS, PGA M ...
NYC Building Code 2014 > 18 Soils and Foundations > 1813 Liquefaction Analysis > 1813.2 Site-Specific Analyses