UFC 4-010-01
8 October 2003
B-1.3.2
Unattended Vehicles. Do not allow unattended vehicles in drive-up or
drop-off areas or drive-through lanes.
B-1.3.3
Location. Do not allow drive-through lanes or drive-up/drop-off to be
located under any inhabited portion of a building.
B-1.4
Standard 4. Access Roads. Where access roads are necessary for the
operation of a building (including those required for fire department access), ensure that
access control measures are implemented to prohibit unauthorized vehicles from using
access roads within the applicable standoff distances in Table B-1.
B-1.5
Standard 5. Parking Beneath Buildings or on Rooftops. Eliminate
parking beneath inhabited buildings or on rooftops of inhabited buildings. Where very
limited real estate makes such parking unavoidable, the following measures must be
incorporated into the design for new buildings or mitigating measures must be
incorporated into existing buildings to achieve an equivalent level of protection.
B-1.5.1
Access Control. Ensure that access control measures are implemented
to prohibit unauthorized personnel and vehicles from entering parking areas.
B-1.5.2
Structural Elements. Ensure that the floors beneath or roofs above
inhabited areas and all other adjacent supporting structural elements will not fail from
the detonation in the parking area of an explosive equivalent to explosive weight II in
Table B-1.
B-1.5.3
Progressive Collapse. All structural elements within and adjacent to the
parking area will be subject to all progressive collapse provisions of Standard 6 except
that the exterior member removal provision will also apply to interior vertical or
horizontal load carrying elements. Apply those provisions based on an explosive
equivalent to explosive weight II in Table B-1.
B-2
STRUCTURAL DESIGN. If the minimum standoff distances are achieved,
conventional construction should minimize the risk of mass casualties from a terrorist
attack. Even if those standoff distances can be achieved, however, incorporate the
following additional structural issues that must be incorporated into building designs to
ensure that buildings do not experience progressive collapse.
B-2.1
considered to be significant risk for buildings of three or more stories. Basements will
be considered stories if they have one or more exposed walls. For all new and existing
inhabited buildings of three stories or more, design the superstructure to sustain local
damage with the structural system as a whole remaining stable and not being damaged
to an extent disproportionate to the original local damage. Achieve this through an
arrangement of the structural elements that provides stability to the entire structural
system by transferring loads from any locally damaged region to adjacent regions
capable of resisting those loads without collapse. Accomplish this by providing
sufficient continuity, redundancy, or energy dissipating capacity (ductility, damping,
hardness, etc.), or a combination thereof, in the members and connections of the
structure. For further guidance, refer to American Society of Civil Engineers Standard
B-7
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