UFC 4-010-01
8 October 2003
Including change 1, 22 January 2007
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-2
STRUCTURAL DESIGN. If the conventional construction 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 measures into building designs
to ensure that buildings do not experience progressive collapse or otherwise experience
disproportionate damage.
B-2.1
considered to be a 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 DoD buildings of three stories or more, regardless of the standoff distance
provided, 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.
B-2.1.1
Progressive Collapse Avoidance Design Procedures. Competent
structural engineers who engage in design work typical or similar to DoD facility design
can address the design requirements necessary to reduce the potential of progressive
collapse for new and existing facilities required by these standards. For existing and
new construction, the progressive collapse avoidance design procedure involves the
application of the tie force method and/or alternate path method.
B-2.1.1.1
Tie Force Method. The tie force method is an indirect design method that
provides resistance to progressive collapse by enhancing continuity, ductility, and
structural redundancy through the design of elements within the structure that tie the
members together so they can bridge over damaged areas. The tie force method
B-8
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