Blast resistant concrete block walls 1

[Karlos80]

Hi All,

I have a project where need to design a 8m high blast resistant masonry wall. All interior walls for the refrigeration plant have to be designed to withstand outward pressure of at least 2.4kpa (50lb/SF) in excess of the design outward pressure of the other refrigeration plant room walls.

Any suggestions what is the best solution and how to design a wall for a blast/explosion,etc?

Thank you
Regards
Karol

 

[VoyageofDiscovery]

Try Fyfe Tyfo® Fibrwrap® Systems, simply do a google search.

 

[BAretired]

Will there be a blowout panel in the wall?

BA

 

[Karlos80]

No, all internal walls must resist the blast pressure. There are external blow out panels, but internal need to take the load.

 

[BAretired]

A pressure of 50 psf in excess of the pressure on the other walls means design pressure is about 60 psf, is that about right? If that is the criteria, design can proceed on that basis, but I am wondering where that criteria came from. If some of the areas are enclosed, i.e. without any pressure relief in the form of blowout panels, I would expect the pressure to be higher than that.

If any of the walls are bearing walls, that is another consideration. A roof framing plan of the area requiring blast-proofing would be helpful showing probable locations of blowout panels.

BA

 

[IRstuff]

National Concrete Masonry Association (NCMA) has TEK 14-21 BLAST AND BULLET RESISTANT CONCRETE MASONRY BUILDINGS, could be a start

http://www.ncma.org/etek/Pages/ManualViewer.aspx?filename=TEK 14-21.pdf&apf=1

National Academies Press has Protecting Buildings from Bomb Damage: Transfer of Blast-Effects Mitigation Technologies from Military to Civilian Applications

http://www.nap.edu/catalog.php?record_id=5021

and Protecting People and Buildings from Terrorism: Technology Transfer for Blast-effects Mitigation

http://www.nap.edu/catalog.php?record_id=10230

The Effects of Explosive Blast on Structures & Personnel.pdf not sure where I got that from

Army Corps of Engineers has something similar to TEK 14-21, but I can't find it, but there is this:

https://pdc.usace.army.mil/library/tr/06-08

TTFN
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[IRstuff]

I think this is the link:

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

TTFN
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[BAretired]

My computer tells me that last link is "untrusted". I don't want to take the chance.

BA

 

[Karlos80]

thanks Fox for your comments.

Just for clarification, the refrigeration plant is to be enclosed by two external blow out panels and two internal masonry walls which must resist the blast pressure. The 50psf came from the client, this a tender I am working on.
I wonder if there is any rule of thumb I can use to quickly size the wall or maybe a special restraining system? I assume it would have to be a sort of hollow block reinforced with vertical rebar and tied to a steel frame?

 

[IRstuff]

You mean the PDC site?

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

That's a whole website "Protective Design Center" devoted to building structures to resist terrorist attacks.

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[BAretired]

Attached is the message I get when I try to access that site:

BA

 

[IRstuff]

Well, what can I say? It's a legitimate site to me.

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[Gumpmaster]

It's a legitimate site, they just have bad security certificates. They always have. It's pretty ironic for an organization dedicated to security (albeit phisycal, not I.T.). Don't worry about the "untrusted site".

 

[steellion]

1. If it's a government/military project, go to the Protective Design Center website and get their dynamic blast analysis software SBEDS. It's free, but they track it for security reasons, so you'll have to provide credentials. It's easier to get it if you are working on a govt. project requiring blast resistance.
2. If you can't get the dynamic software, there are equivalent static-analysis designs, but they are much more conservative. Go to the Whole Building Design Guide

http://www.wbdg.org

and download the UFC's for anti-terrorism/blast resistance. These are also free; the basic UFC blast criteria document is declassified and does not require clearance.

 

[FeliceSelene]

Karlos

If there are no issues on the budget I suggest that this masonry wall be covered with steel plate on both sides. Certainly these plates could increase the resistant of the masonry from blast.

 

[IRstuff]

"It's a legitimate site, they just have bad security certificates. "

That's true of almost all of the military and even some government sites.

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[BAretired]

Maybe it's time they smartened up.

BA

 

[IRstuff]

It's not necessarily a matter of smarts, but also priority. A B2B or websales site would have to be current just to make sure that sales don't grind to halt, but at this point in the Internet age, sites that are directly tied to profits don't have full-time webmasters keeping an eye on things like that.

TTFN
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