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RE: Very short load duration

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This is on the order of a blast load, and is not an easy issue.  Even if modeled in LS Dyna, fidelity to a tested assembly is not very good.  That is why there is a lot of testing required for blast applications.  Once you have a test from which you can gauge, you can apply SDOF models with some measure of assurance that your answer is correct. 
 
Go to:
http://www.wbdg.org/ccb/DOD/UFC/ufc_3_340_02.pdf
Then go to the "Downloadable files".  Start downloading, have a cup of coffee, then read the almost 2 thousand pages on how to design for blast loading.  Another standard to understanding blast loads is Biggs, Introduction to Structural Dynamics.  Biggs was last published in 1964.


Regards, Harold Sprague


 

From: jimcarey(--nospam--at)jgsteel.com
To: seaint(--nospam--at)seaint.org
Subject: Very short load duration
Date: Wed, 8 Jul 2009 08:43:12 -0500

I have a steel duct that is to be designed for, among other things, a “severe pressure pulse” load that lasts 10 milliseconds.  I am trying to use STAAD’s Time History Load function to analyze this and want to be able to give it a sanity check.  The short duration would seem immaterial for steel design; the quick application brings impact effects to mind.  Has anyone dealt with this to know how the results should compare with those from a static load of equal magnitude – better, worse or same?  Thanks.

 

Jim Carey, P.E.

 



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