Level | Description |
Operational | Very light damage, no permanent drift, structure retains original strength and stiffness; all systems are normal |
Immediate Occupancy (IO) | Light damage, no permanent drift, structure retains original strength and stiffness, elevator can be restarted, Fire protection operable |
Life Safety (LS) | Moderate damage, some permanent drift, some residual strength and stiffness left in all stories, damage to partition, building may be beyond economical repair |
Collapse Prevention (CP) | Severe damage, large displacement, little residual stiffness and strength but loading bearing column and wall function, building is near collapse |