// CODE SNIPPET
Section 303 Performance Groups
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Use groups and hazard-related occupancies have been allocated to performance groups using the risk factors identified in Section 302.4. Specific buildings and facilities have been allocated to performance groups using the risk factors identified in Section 302.4 combined with the relative importance of protecting the building or facility to the community. These performance group allocations are shown in Table 303.1.
[BG] TABLE 303.1
PERFORMANCE GROUP CLASSIFICATIONS FOR BUILDINGS AND FACILITIES
PERFORMANCE GROUP | USE AND OCCUPANCY CLASSIFICATIONS FOR SPECIFIC BUILDINGS OR FACILITIES |
I | Buildings and facilities that represent a low hazard to human life in the event of failure, including, but not limited to:
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II | All buildings and facilities except those listed in Performance Groups I, III and IV. |
III | Buildings and facilities that represent a substantial hazard to human life in the event of failure, including, but not limited to:
|
IV | Buildings and facilities designated as essential facilities, including, but not limited to:
|
Where necessary or desired, allocation of specific buildings or facilities to performance groups differing from Table 303.1 is permitted based on the needs specific to a community or owner or if there are unusual circumstances associated with the building or facility.
Performance groups identify the minimum required performance of buildings or facilities through a relationship of the magnitude of an event to the maximum level of damage to be tolerated shown in Table 303.3. The use of Table 303.3 shall be an iterative process. It shall be used to determine the acceptable impact of certain events based on their magnitude, and then used iteratively to evaluate various designed mitigation features. Assignment of performance groups is accomplished through consideration of building or facility uses, building or facility risk factors, and the importance of a building or facility to a community.
[BG] TABLE 303.3
MAXIMUM LEVEL OF DAMAGE TO BE TOLERATED BASED ON PERFORMANCE GROUPS AND DESIGN EVENT MAGNITUDES
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There are four performance groups (PG), identified as I, II, III and IV.
The minimum design performance level with which all buildings or facilities posing a low risk to human life, should the buildings or facilities fail, shall comply.
The minimum design performance level with which all buildings or facilities subject to this code, except those classified as PG I, PG III or PG IV, shall comply.
The minimum design performance level with which buildings or facilities of an increased level of societal benefit or importance shall comply.
The minimum design performance level with which buildings or facilities that present an unusually high risk or that are deemed essential facilities shall comply.
The performance group for specific buildings or facilities or classes of buildings or facilities is permitted to be redesignated with the approval of the code official. If a higher design performance level is desired, the design team, with the approval of the code official, shall be permitted to choose a higher performance group. For existing buildings or facilities, the code official is authorized to adjust tolerable limits of impact to a building or facility and its contents.
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