Structural Performance Levels
Building Response Range
Collapse Prevention-The building barely remains standing with significant structural and
nonstructural damage. This range of performance, where collapse is imminent, is an
unacceptable performance range for all new military buildings.
Life Safety-The building remains stable with significant reserve capacity. Structural damage
is moderate requiring significant post-earthquake repairs, however, collapse is precluded.
This is the basic range of performance for all new military buildings, except as defined
Safe Egress-The building structural system remains fully safe for occupancy following the
earthquake. Essential functions are sufficiently disrupted to prevent immediate post-
earthquake occupancy of the building. Structural damage is light, allowing fairly rapid post-
Immediate Occupancy-The building structure remains safe to occupy and all essential
functions remain operational. It may be used for post-earthquake recovery and to perform
essential operational military missions within a few hours following an earthquake. The
building has limited structural damage, which may be repairable while occupied.
Table 4-3. Structural Performance Levels