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FBI Headquarters, Chicago, IL

Focusing on structural efficiency and site security led to the extensive use of composite construction in this multi-building complex for the US General Services Administration. The 10-story office tower’s concrete-filled steel tube columns provide significant resistance to blast hazards.


The typical office floors consist of lightweight concrete on metal deck, supported by structural steel beams with spans up to 42 feet. The connections for the composite steel floor framing were designed to resist both tension and shear, thereby preventing progressive collapse in the case of localized damage. Progressive collapse provisions were met at a nominal cost increase over standard office construction.