Blast design for roofs

[twheng]

Our office is in the process of designing a small tiltup with very low blast. Our question is with the roof. We are planning on using concrete over metal pan because the metal deck manufacturer does not have specs for blast. Has anyone crossed this path? Is there any design proceedures or examples to help with this?

 

[IRstuff]

The Army Corps and Air Force have various documents on explosiion resistant building, but I'm not sure what detail is available within them.

TTFN

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[onlineeng]

This link may provide some useful information:

http://www.aees.org.au/Proceedings/2007_Papers/07_Remenikov,_Alex.pdf

 

[hawkaz]

What type of blast is this (Detonation or deflagration)?
What are you doing for blast relief venting?

I have used concrete over steel deck for blast rooms in the past, but attaching to tilt panels makes me nervous.

 

[ztengguy]

we did one once, and the roof was the vent, the walls were designed to take the blast and deflect upwards. used a pin to fasten the deck that would come off at some prescribed pressure. Had a beam system to provide stability if it did blow, so we didnt cause the walls to be unsupported.

 

[haynewp]

If it is an external threat you designing for, ASCE's book "Design of Blast Resistant Buildings in Petrochemical Facilities" goes through an example of a roof design for an external blast wave.

 

[kmead]

You can definitely use metal deck alone, especially for "very low blast". You can go to the Protective Design Center

https://pdc.usace.army.mil/

and sign up to download a spreadsheet called SBEDS. It allows you to analyze metal deck based on gage, span, stand-off distance, charge weight...etc.

Otherwise, if you still want to use concrete over the metal pan, you can buy PCA's "Blast Resistant Design Guide" which has some good examples that might be helpful.