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RE: bullet-proof glass anchorage

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BP glazing is very heavy.  Per the building code, you have to resist the 5 
psf partition load, or the seismic demand whichever is greater.  Unless you 
 have a very small glazing area, it would be difficult to imangine that the 
 impact of a bullet using UL 752, Level 4 to drive the frame design.  The 
UL 751, Level 4 is a single shot from a 30-06, 180 grain, JSP, at a 
velocity range of 2540 to 2794 fps.

You can perform a nonlinear dynamic analysis and make a conservative 
assumption of steel to get the penetration.  I think that you will find 
that because of the mass of the glass, it will be difficult for the impact 
loading to be consequential for the frame.

You can also call a BP glazing manufacturer to get some bounding design 
information for the frame.  Global Security provides installation details.


Regards, Harold Sprague

> Date: Wed, 22 May 2013 15:00:05 -0700
> From: d.topete73(--nospam--at)
> Subject: Re: [SEAINT-SEAOSC] bullet-proof glass anchorage
> To: seaint-seaosc(--nospam--at)
> Thanks, Lloyd. I'm chasing for a performance spec from the user/client.
> The glass itself is level 4. I would venture to guess it'd be similar to
> a bank teller window. (Not uncommon in some urban areas...) The bp glass
> frame would attach to the metal stud framing. But, I doubt they want it
> detailed and framed as your standard non-bearing interior partition.
> On Wed, May 22, 2013 at 2:49 PM, Lloyd Pack
> <lloyd(--nospam--at)>wrote:
>> I would think that it has a lot to do with what your client wants
>> and what the application of the bulletproof glass is doing.
>> Is this for a building's exterior window? Is this for a bank
>> teller window? Do they want this to stop all bullets, or just
>> handgun bullets? Should the frame be the weak point? If the

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