Cover [PDF]

Standards [PDF]

Foreword [PDF]

Acknowledgements [PDF]

Dedication [PDF]

Contents [PDF]

Chapter 1 General

Chapter 2 Combinations of Loads

Chapter 3 Dead Loads, Soil Loads, and Hydrostatic Pressure

Chapter 4 Live Loads

Chapter 5 Flood Loads

Chapter 6 Reserved for Future Provisions

Chapter 7 Snow Loads

Chapter 8 Rain Loads

Chapter 9 Reserved for Future Provisions

Chapter 10 Ice Loads - Atmospheric Icing

Chapter 11 Seismic Design Criteria

Chapter 12 Seismic Design Requirements for Building Structures

Chapter 13 Seismic Design Requirements for Nonstructural Components

Chapter 14 Material Specific Seismic Design and Detailing Requirements

Chapter 15 Seismic Design Requirements for Nonbuilding Structures

Chapter 16 Seismic Response History Procedures

Chapter 17 Seismic Design Requirements for Seismically Isolated Structures

Chapter 18 Seismic Design Requirements for Structures with Damping Systems

Chapter 19 Soil-Structure Interaction for Seismic Design

Chapter 20 Site Classification Procedure for Seismic Design

Chapter 21 Site-Specific Ground Motion Procedures for Seismic Design

Chapter 22 Seismic Ground Motion Long-Period Transition and Risk Coefficient Maps

Chapter 23 Seismic Design Reference Documents

Chapter 24

Chapter 25

Chapter 26 Wind Loads: General Requirements

Chapter 27 Wind Loads on Buildings‒MWFRS (Directional Procedure)

Chapter 28 Wind Loads on Buildings‒MWFRS (Envelope Procedure)

Chapter 29 Wind Loads on Other Structures and Building Appurtenances‒MWFRS

Chapter 30 Wind Loads ‒ Components and Cladding (C&C)

Chapter 31 Wind Tunnel Procedure

Appendix 11A Quality Assurance Provisions

Appendix 11B Existing Building Provisions

Appendix C Serviceability Considerations

Appendix D Buildings Exempted from Torisional Wind Load Cases

Contained in this chapter are Figs. 22-1 through 22-6, which provide the risk-targeted maximum considered earthquake (MCER) ground motion parameters Ss and S1; Figs. 22-17 and 22-18, which provide the risk coefficients CRS and CR1; and Figs. 22-12 through 22-16, which provide the long-period transition periods TL for use in applying the seismic provisions of this standard. SS is the risk-targeted MCER, 5% damped, spectral response acceleration parameter at short periods as defined in Section 11.4.1. S1 is the risk-targeted MCER ground motion, 5% damped, spectral response acceleration parameter at a period of 1 s as defined in Section 11.4.1. CRS is the mapped risk coefficient at short periods used in Section 21.2.1.1. CR1 is the mapped risk coefficient at a period of 1 s used in Section 21.2.1.1. TL is the mapped long-period transition period used in Section 11.4.5.
      These maps were prepared by the United States Geological Survey (USGS) in collaboration with the Building Seismic Safety Council (BSSC) Seismic Design Procedures Reassessment Group and the American Society of Civil Engineers (ASCE) 7 Seismic Subcommittee and have been updated for the 2010 edition of this standard.
       Maps of the MCER ground motion parameters, SS and S1, for Guam and American Samoa are not provided because parameters have not yet been developed for those islands. Therefore, as in the 2005 edition of this standard, the parameters SS and S1 shall be, respectively, 1.5 and 0.6 for Guam and 1.0 and 0.4 for American Samoa. Maps of the mapped risk coefficients, CRS and CR1, are also not provided.
       Also contained in this chapter are Figs. 22-7 through 22-11, which provide the maximum considered earthquake geometric mean (MCEG) peak ground accelerations as a percentage of g for Site Class B.
FIGURE 22-1 SS Risk-Targeted Maximum Considered Earthquake (MCER) Ground Motion Parameter for the Conterminous United States for 0.2 s Spectral Response Acceleration (5% of Critical Damping), Site Class B


FIGURE 22-1 (Continued)


FIGURE 22-2 S1 Risk-Targeted Maximum Considered Earthquake (MCER) Ground Motion Parameter for the Conterminous United States for 1 s Spectral Response Acceleration (5% of Critical Damping), Site Class B


FIGURE 22-2 (Continued)


FIGURE 22-3 SS Risk-Targeted Maximum Considered Earthquake (MCER) Ground Motion Parameter for Alaska for 0.2 s Spectral Response Acceleration (5% of Critical Damping), Site Class B


FIGURE 22-4 S1 Risk-Targeted Maximum Considered Earthquake (MCER) Ground Motion Parameter for Alaska for 1.0 s Spectral Response Acceleration (5% of Critical Damping), Site Class B


FIGURE 22-5 SS and S1 Risk-Targeted Maximum Considered Earthquake (MCER) Ground Motion Parameter for Hawaii for 0.2 and 1.0 s Spectral Response Acceleration (5% of Critical Damping), Site Class B


FIGURE 22-6 SS and S1 Risk-Targeted Maximum Considered Earthquake (MCER) Ground Motion Parameter for Puerto Rico and the United States Virgin Islands for 0.2 and 1.0 s Spectral Response Acceleration (5% of Critical Damping), Site Class B


FIGURE 22-7 Maximum Considered Earthquake Geometric Mean (MCEG) PGA, % g, Site Class B for the Conterminous United States


FIGURE 22-7 (Continued)


FIGURE 22-8 Maximum Considered Earthquake Geometric Mean (MCEG) PGA, % g, Site Class B for Alaska


FIGURE 22-9 Maximum Considered Earthquake Geometric Mean (MCEG) PGA, % g, Site Class B for Hawaii


FIGURE 22-1O Maximum Considered Earthquake Geometric Mean (MCEG) PGA, % g, Site Class B for Puerto Rico and the United States Virgin Islands


FIGURE 22-11 Maximum Considered Earthquake Geometric Mean (MCEG) PGA, % g, Site Class B for Guam and American Samoa


FIGURE 22-12 Mapped Long-Period Transition Period, TL (s), for the Conterminous United States


FIGURE 22-12 (Continued)


FIGURE 22-13 Mapped Long-Period Transition Period, TL (s), for Alaska


FIGURE 22-14 Mapped Long-Period Transition Period, TL (s), for Hawaii


FIGURE 22-15 Mapped Long-Period Transition Period, TL (s), for Puerto Rico and the United States Virgin Islands


FIGURE 22-16 Mapped Long-Period Transition Period, TL (s), for Guam and American Samoa


FIGURE 22-17 Mapped Risk Coefficient at 0.2 s Spectral Response Period, CRS


Notes:
  • Maps prepared by United States Geological Survey (USGS).
  • Larger, more detailed versions of these maps are not included because it is recommended that the corresponding USGS web tool (http://earthquake.usgs.gov/designmaps/) be used to determine the mapped value for a specified location.
FIGURE 22-17 (Continued)


FIGURE 22-18 Mapped Risk Coefficient at 1.0 s Spectral Response Period, CR1



Notes:
  • Maps prepared by United States Geological Survey (USGS).
  • Larger, more detailed versions of these maps are not included because it is recommended that the corresponding USGS web tool (http://earthquake.usgs.gov/designmaps/) be used to determine the mapped value for a specified location.
FIGURE 22-18 (Continued)
Resources