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RE: Upward load on slabs per UFC 4-023-03

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I can’t speak to the first question you posed, but I have done a Corps project with brick veneer over metal stud wall.  I can’t remember if there were any specific requirements in the UFC, but it was detailed with a 4” gap, which included 2” of rigid insulation and a 2” air gap.  HTH.


Doug Mayer, SE


From: David Watt [mailto:dwatt(--nospam--at)]
Sent: Thursday, November 20, 2008 11:43 AM
To: seaint(--nospam--at)
Subject: Upward load on slabs per UFC 4-023-03


I am working on a Corps of Engineers project that is required to resist progressive collapse. The project is a “Low Level of Protection” building that meets all setback requirements. I am unclear on how to interpret UFC 4-023-03 section 2-2.2 “Upward Loads on Floors and Slabs”. It states “In each bay and at all floors and the roof, the slab/floor system must be able to withstand a net upward load of a magnitude 1.0D+0.5L.” It goes on to say “Design the floor system in each bay and its connections to the beams, girders, columns, capitals, etc to carry this load.”


In the case of steel beams supporting concrete on metal deck I assume the concretes slab on metal deck will need to be designed for that upward pressure as well as its connection to the supporting structure. Where I am unclear is, are the floor beams required to be designed for the upward load applied to their tributary area with the bottom flange un-braced? If so, is bottom flange bridging typical provided to if reduce the beam section. Or does the upward load requirement only apply to the slab and its connections and not to the beams?


Also, is brick veneer on metal stud backup an allowable exterior wall construction for this type of project? All of the research I have found so far addresses the building structure and not so much the building envelope. Are there any special requirements to using brick veneer on metal stud for exterior walls on this type of project?


David M. Watt