Specifies the occupancy importance factor, based on the function of the structure. The calculated spectrum accelerations are multiplied by this value to generate the horizontal shock spectrum.
ASCE 7
The occupancy importance factor is I, as defined in Table 11.5. Values range from 1.0 to 1.5 and applied according to paragraph 12.9.2.
IBC
The occupancy importance factor is IE, as defined in Section 1616.2 and shown in Table 1604.5. Values range from 1.0 to 1.5.