Thursday, January 10, 2008

Re: UFC 3-340-01 "Design and Analysis of Hardened Structures to Conventional Weapons Effects"

Glen,
That is O.K. unless "back in the direction from whence it came" is your boss, employer, payroll check signer.  I've been there before.  You don't always have a choice.
Joe Grill
----- Original Message -----
Sent: Thursday, January 10, 2008 8:09 AM
Subject: RE: UFC 3-340-01 "Design and Analysis of Hardened Structures to Conventional Weapons Effects"

On Jan 9, 2008 1:57 PM, Thomas Davidson <TDavidson@atlasengineering.com>
wrote:
> I am new to this blast analysis and was kind of thrown a project.  But, I
> was wondering, since this thread came up; if I could get some advice on how
> to analyze bolted connections.  I went a conservative route; I got the peak
> overburden pressure and applied it as a wind pressure on the structure
> itself and the "structure" works, the connections however fail miserably.
> Because the load is only going to be applied for a few milliseconds is there
> a justified Dynamic Increase Factor (DIF) for bolts?  Or is there some way I
> can justify that the bolts will not fail?
>
> Thanks
>
> *Thomas Davidson*

Thomas, based on what you've described/asked, I strongly recommend that you 'kind of throw the project back' in the direction from whence it came, & start reading up on blast design (i.e., if think you'd like to actually work on a future one of these thrown your way). 

Off the top of my head, Structural Design for Physical Security, State of the Practice, ASCE, 1999, would be a good, readily-available place to start.  And the documents referenced therein are all of the 'important' ones.

For recent developments search archives of the following magazines:  Modern Steel Construction, Structure, Civil Engineering, The Military Engineer, & Structural Engineer.  They've published many good articles on blast design & related topics, some specific to structural steel, since 2003.

Finally, be on the look-out for the soon-to-be published, Blast Protection of Buildings, by ASCE; this will be the 1st national standard on this issue.

Glen

Glen Pappas, Ph.D., PE, SECB, BSCP
Los Alamos National Laboratory
ES-DE
Technical Staff Member
Phone: 505-665-1221
Fax: 505-665-4728
MS M791
TA-00-0786
gpappas@lanl.gov

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