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1604.5 Structural Occupancy Category
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Each building and structure shall be assigned a structural occupancy category in accordance with Table 1604.5.
STRUCTURAL OCCUPANCY/ RISK CATEGORYa | NATURE OF OCCUPANCY/RISK |
I | Buildings and other structures that represent a low hazard to human life in the event of failure including, but not limited to:
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II | Buildings and other structures except those listed in Structural Occupancy/Risk Categories I, III and IV |
III | Buildings and other structures that represent a substantial hazard to human life in the event of failure including, but not limited to:
|
IV | Buildings and other structures designed as essential facilities including, but not limited to:
|
- For purposes of occupant load calculation, occupancies required by Table 1004.1.1 to use gross floor area calculations shall be permitted to use net floor areas to determine the total occupant load.
1604.5.1 Multiple Occupancies
Where a building or structure is occupied by two or more occupancies not included in the same structural occupancy category, it shall be assigned the classification of the highest structural occupancy category corresponding to the various occupancies. Where buildings or structures have two or more portions that are structurally separated, each portion shall be separately classified. Where a separated portion of a building or structure provides required access to, required egress from or shares life safety components with another portion having a higher structural occupancy category, both portions shall be assigned to the higher structural occupancy category.
1604.5.2 Importance Factors
Importance factors for snow, wind and seismic loads shall be determined in accordance with Table 1604.5.2 based on the Structural Occupancy Category or Risk Category assigned in accordance with Table 1604.5.
TABLE 1604.5.2 IMPORTANCE FACTORS
TABLE 1604.5.2 IMPORTANCE FACTORS
STRUCTURAL OCCUPANCY/RISK CATEGORY | SNOW IMPORTANCE FACTOR, I | WIND IMPORTANCE FACTOR, I | SEISMIC IMPORTANCE FACTOR, I |
I | 0.80 | 0.87 | 1.00 |
II | 1.00 | 1.00 | 1.00 |
III | 1.10 | 1.15 | 1.25 |
IV | 1.20 | 1.15 | 1.50 |
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