// CODE SNIPPET

# 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,

where:

*S*, and at 1-second period,

_{MS}*S*, adjusted for

_{M1}*site class*effects shall be determined by Equations 16-37 and 16-38, respectively:

where:

F_{a} | = | Site coefficient defined in Table 1613.3.3(1). |

F_{v} | = | Site coefficient defined in Table 1613.3.3(2). |

S_{S} | = | The mapped spectral accelerations for short periods as determined in Section 1613.3.1. |

S_{1} | = | The mapped spectral accelerations for a 1-second period as determined in Section 1613.3.1. |

SITE CLASS | MAPPED SPECTRAL RESPONSE ACCELERATION AT SHORT PERIOD | ||||

≤ S_{s}0.25 | S = 0.50_{s} | S = 0.75_{s} | S = 1.00_{s} | ≥S_{s} 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 |

- Use straight-line interpolation for intermediate values of mapped spectral response acceleration at short period,
*S*._{s} - Values shall be determined in accordance with Section 11.4.7 of ASCE 7.

SITE CLASS | MAPPED SPECTRAL RESPONSE ACCELERATION AT 1-SECOND PERIOD | ||||

≤S_{1} 0.1 | S_{1} = 0.2 | S_{1} = 0.3 | S_{1} = 0.4 | ≥ S_{1}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 |

- Use straight-line interpolation for intermediate values of mapped spectral response acceleration at 1-second period,
*S*_{1}. - Values shall be determined in accordance with Section 11.4.7 of ASCE 7.

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