UFC 4-010-01
8 October 2003
Including change 1, 22 January 2007
conservative for some construction types, these standards allow for the adjustment of
standoff distances based on the results of a structural analysis considering the
applicable explosive weights in Table B-1. For new buildings, even if such an analysis
suggests a standoff distance of less than those shown in the "Minimum Standoff
Distance" column of Table B-1, standoff distances of less than those in that column are
not allowed to ensure there is a minimal standoff distance "reserved" to accommodate
future upgrades that could be necessitated by emerging threats. In addition, the 10
meter (33 feet) minimum is established to ensure there is no encroachment on the
unobstructed space. For existing buildings, the standoff distances in the "Minimum
Standoff Distance" column of Table B-1 will be provided except where doing so is not
possible. In those cases, lesser standoff distances may be allowed where the required
level of protection can be shown to be achieved through analysis or can be achieved
through building hardening or other mitigating construction or retrofit.
2-4.5.3
Operational Option for Existing Buildings. Because moving parking
and roadways associated with existing buildings or applying structural retrofits to harden
those buildings may be impractical, operational options are provided for complying with
the standoff distance requirements for existing parking and roadways associated with
existing buildings (including leased buildings). Those operational options allow for
establishing access control for parking at the applicable standoff distances in either
Table B-1 or Table D-1, in which case parking can be allowed to be as close as 10
meters to buildings without hardening or analysis.
The access control in those situations must be established at a location in
accordance with Tables B-1 or D-1. The assumption is that by establishing access
control into the parking lot, there will be a lesser opportunity to enter the parking area
with an explosive in a vehicle. For roadways, the operational option is to prohibit
parking along roadways within the applicable standoff distances in Tables B-1 and D-1.
These operational options will result in increased risk for existing
buildings, but acceptance of that risk is necessary to make application of these
standards to existing buildings practical. The additional option for allowing parking even
closer than 10 meters (33 feet) as long as the applicable level of protection is met, is
based on the recognition that there may be some buildings, especially in urban areas,
where achieving even 10 meters (33 feet) is not possible.
2-4.5.4
Temporary and Expeditionary Construction. The standoff distances in
Table D-1 are based on blast testing conducted against TEMPER Tents, SEA Huts,
General Purpose Shelters, and Small Shelter Systems. With adequate analysis those
distances may be able to be reduced without requiring mitigating measures.
2-6
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