Seismic Importance Factor, I
| Occupancy Category | Occupancy or Functions of Structure1 | Seismic Importance, I |
| 1. Essential facilties | Group I, Division 1 Occupancies having surgery and emergency treatment areas Fire and police stations Garages and shelters for emergency vehicles and emergency aircraft Structures and shelters in emergency-preparedness centers Aviation control towers Structures and equipment in government communication center and other facilities required for emergency response Standby power-generating equipment for Category 1 facilities Tanks or other structures containing housing or supporting water or other fire-suppression material or equipment required for the protection of Category 1, 2 or 3 structures |
1.25 |
| 2. Hazardous facilities | Group H, Divisions 1, 2, 6 and 7 Occupancies and structures therein housing or supporting toxic or explosive chemicals or substances Nonbuilding structures housing, supporting or containing quantities of toxic or explosive substances that, if contained within a building, would cause that building to be classified as a Group H, Division 1, 2 or 7 Occuoancy. |
1.25 |
| 3. Special occupancy structures | Group A, Divisions 1, 2 and 2.1 Occupancies Building housing Group E, Divisions 1 and 3 Occupancies with a capacity greater than 300 students Building housing Group B Occupancies used for college or adult education with a capacity greater than 500 students Group I, Divisions 1 and 2 Occupancies with 50 or more resident incapacitanted patients, but not included in Category 1 Gouup I, Division 3 Occupancies All structures with an occupancy greater than 5,000 persons Structures and equipment in power-generating stations, and other public utilities not included in Category 1 or Category 2 above, and required for continued operation. |
1.00 |
| 4. Standard occuoancy structures | All structures housing occupancies or having functions not listed in Category 1, 2 or 3 and Group U Occupancy towers | 1.00 |
| 5. Miscellaneous structures | Group U Occuoancies except for towers | 1.00 |
1See Table2-1