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RE: Very short load duration

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Jim
 
    It has been more then a few years but as I remember it the Modules of Elasticity for steel increased by 10% for very short pipe burst loads.
 
 
Acie
-----Original Message-----
From: Jim Carey [mailto:jimcarey(--nospam--at)jgsteel.com]
Sent: Wednesday, July 08, 2009 6:43 AM
To: seaint(--nospam--at)seaint.org
Subject: Very short load duration

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.