This Unified Facilities Criteria (UFC) provides the design requirements necessary to reduce the potential of progressive collapse for new and existing facilities that experience localized structural damage through normally unforeseeable events.
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http://www.wbdg.org/ccb/DOD/UFC/ufc_4_023_03.pdf
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Code
Design of Buildings to Resist Progressive Collapse http://www.wbdg.org/ccb/DOD/UFC/ufc_4_023_03.pdf