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[B] 301.1.4.1 Compliance With IBC Level Seismic Forces
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Where compliance with the seismic design provisions of the International Building Code is required, the procedures shall be in accordance with one of the following:
- One-hundred percent of the values in the International Building Code. Where the existing seismic force-resisting system is a type that can be designated as "Ordinary," values of R, Ω0 and Cd used for analysis in accordance with Chapter 16 of the International Building Code shall be those specified for structural systems classified as "Ordinary" in accordance with Table 12.2-1 of ASCE 7, unless it can be demonstrated that the structural system will provide performance equivalent to that of a "Detailed," "Intermediate" or "Special" system.
- Compliance with ASCE 41 using both the BSE-1 and BSE-2 earthquake hazard levels and the corresponding performance levels shown in Table 301.1.4.1.
| RISK CATEGORY (Based on IBC Table 1604.5 ) |
PERFORMANCE LEVEL FOR USE WITH ASCE 41 BSE-1 EARTHQUAKE HAZARD LEVEL |
PERFORMANCE LEVEL FOR USE WITH ASCE 41 BSE-2 EARTHQUAKE HAZARD LEVEL |
| I | Life safety (LS) | Collapse prevention (CP) |
| II | Life safety (LS) | Collapse prevention (CP) |
| III | Note a | Note a |
| IV | Immediate occupancy (IO) | Life safety (LS) |
- Acceptance criteria for Risk Category III shall be taken as 80 percent of the acceptance criteria specified for Risk Category II performance levels, but need not be less than the acceptance criteria specified for Risk Category IV performance levels.
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Related Code Sections
301.1.4.1 Compliance Methods, Compliance With IBC Level Seismic Forces
PERFORMANCE CRITERIA FOR IBC—LEVEL SEISMIC FORCES OCCUPANCY
RISK CATEGORY (Based on IBC Table 1604.5 )
PERFORMANCE LEVEL FOR USE WITH ASCE 41 BSE-1 ...
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