UFC 4-010-01
8 October 2003
Including change 1, 22 January 2007
glass, the design loads distributed to the frames, the connections, and the supporting
structural elements will be based on the ultimate resistance of the glazing being used.
B-3.1.4
Alternate Method of Analysis. As an alternative to the design approach
described above, any or all of the glazing, framing members, connections, and
supporting structural elements may be designed using dynamic analysis to prove the
window system will provide performance equivalent to or better than the hazard rating
associated with the applicable level of protection as indicated in Table 2-1. The design
loading for a dynamic analysis will be the appropriate pressure and impulse from the
applicable explosive weight at the actual standoff distance at which the window is sited,
but not greater than the conventional construction standoff distance. The design
loading will be applied over the areas tributary to the element being analyzed.
B-3.1.5
Testing. As an alternative to the provisions of this standard, window and
skylight systems may be dynamically tested to demonstrate performance equivalent to
or better than the hazard rating associated with the applicable level of protection as
indicated in Table 2-1. Testing will include the entire window or skylight system,
including connections, and will be in accordance with ASTM F 1642. If standoff
distances greater than conventional construction standoff distances are provided, the
standoff distances on which the analysis and testing are based will not exceed the
conventional construction standoff distance.
B-3.1.6
Window and Skylight Replacement Projects. Whenever window and
skylight glazing is being replaced in existing inhabited buildings as part of a planned
window or glazing replacement project, whether or not the building meets the triggers in
paragraph 1-6.2, install glazing and frames that meet all of the requirements above.
B-3.1.7
Alternative Window Treatments. Window retrofit products that rely on
fragment retention film, fragment retention film as part of a retrofit system, or blast
curtain systems generally have higher life cycle costs than laminated glass windows
due to their shorter design lives and due to operation and maintenance issues.
Application of those products, therefore, will be governed by the following paragraphs:
B-3.1.7.1
New Buildings and Existing Buildings Undergoing Major
Renovations or Window Replacement Projects. Window retrofits incorporating
fragment retention film or blast curtains will not be considered an acceptable alternative
for new inhabited buildings or for existing inhabited buildings that are required to comply
with these standards, except for leased buildings as stated below.
B-3.1.7.2
Leased Buildings. For inhabited leased buildings that are required to
comply with these standards, windows using laminated glass are preferred, but window
retrofits incorporating fragment retention film or blast curtains may be allowed if they
provide an equivalent level of protection to the laminated glass windows as long as the
lease agreement stipulates that they will be maintained and replaced in accordance with
manufacturers' recommendations. This will include meeting the requirements for
supporting structural elements. Compliance with the required level of protection may be
demonstrated through analysis or through testing. Testing will be performed in
accordance with ASTM F1642.
B-16
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