ATFP for Pre-Engineered Buildings - UFC 4-010-01

[coatsandrew]

Has anyone had success with requiring the Pre-Engineered Building Manufacturer to design their building for the Blast Requirements of UFC 4-010-01? The building's current conceptual design does not allow for all building components to fall within the Assumed Parameters of Table 2-3 (i.e. main bent frames are spaced outside of the 20-25 feet range given for "Girts" in the Table).

Also, the building wall system will be a "hybrid" system where as brick veneer will be used from FFE to 40" above FFE, with 8" cmu backup. Typical metal panel and wall girt backup system will be provided above the cmu. Does this "hybrid" wall system automatically force us to design the PEB and cmu wall for blast loads, and not consider it Conventional Construction?

Thank you.

 

[vmirat]

You need to contact the installation Anti-Terrorism Officer (ATO) and have them give you a determination on UFC 4-010-01. Every installation has a different Design Basis Threat (DBT). Their DBT may require a higher Level Of Protection (LOP), resulting in higher requirements.

Make sure you even have to meet UFC 4-010-01. If there are 10 or less DoD personnel in the building or the occupancy density is greater than 1pn/430sf, you don't have to.

 

[haynewp]

I wouldn't consider the mixed system to fall within the parameters of that UFC. I doubt the metal building mfr will have designed for blast before and may not be granted permission to the other required documents. You can provide the PEMB mfr a table of equivalent static loads to design for but it may get to be quite expensive. I would try to get away from a PEMB in this case or provide a list of minimum girt, purlin, and column section properties on the drawing based on SDOF. But this can mess up the connection design if they come in with larger columns, girts, or purlins than you will provide reactions for on your drawings and then you would have to rerun things again later. Because of the potential amount of coordination needed, I would suggest not using a PEMB unless you have enough standoff where the component and connection requirements are not controlled by blast.