UFC 3-310-01
25 May 2005
Seismic
Seismic
Snow
Wind
Occupancy
Use
Nature of Occupancy
Factor
Factor
Factor
Category
IE
Group
IS
IW
Buildings and other structures designed as
essential facilities, including, but not limited to:
Hospitals and other health care facilities having
surgery or emergency treatment facilities
Fire, rescue, and police stations, and emergency
vehicle garages
Designated earthquake, hurricane, or other
emergency shelters
Designated emergency preparedness,
communication, and operation centers, and other
facilities required for emergency response
Power-generating stations and other utility facilities
required for primary power or as emergency backup
facilities for Category IV structures
1.50b
III
IV
1.20
1.15
Structures containing highly toxic materials as defined
by Section 307, where the quantity of material exceeds
the maximum allowable quantities of Table 307.7(2)
Aviation control towers, air traffic control centers, and
emergency aircraft hangars that house aircraft required
for post-earthquake emergency response
Buildings and other structures not included in
Category V, having DOD mission-essential command,
control, primary communications, data handling, and
intelligence functions that are not duplicated at
geographically separate locations, as designated by the
using agency
Water treatment facilities required to maintain water
pressure for fire suppression
Facilities designed as national strategic military
assets, including, but not limited to:
Key national defense assets (e.g. National Missile
Defense facilities), as designated by the using agency
Facilities involved in operational missile control,
launch, tracking, or other critical defense capabilities
Emergency backup power-generating facilities
required for primary power for Category V structures
N/AC
1.50C
1.70C
C
C
IV
V
Power-generating stations and other utility facilities
required for primary power for Category V structures, if
emergency backup power generating facilities are not
available
Facilities involved in storage, handling, or processing
of nuclear, chemical, biological, or radiological
materials, where structural failure could have
widespread catastrophic consequences, as designated
by the using agency.
Notes to Table 1, "CLASSIFICATION OF BUILDINGS AND OTHER STRUCTURES FOR
IMPORTANCE FACTORS"
a. In hurricane-prone regions with V>100 miles per hour, Iw shall be 0.77.
b. In the Optional Procedure for the Design of SUG III-A Facilities, IE = 1.0 (See IBC Section 1616.6.2).
c. A new Category and Seismic Use Group have been added to address national strategic military assets.
A Seismic Importance Factor, IE, is not required for the design of these facilities.
1-3
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