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

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I am new to blast and it is a real pain.
This might be of some help, there begins an outline of some beam checks on page 36. Good luck.

On Thu, Nov 20, 2008 at 2:42 PM, David Watt <dwatt(--nospam--at)> wrote:

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