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RE: Design Load Combination(s) for Prestress Slab

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***note to list manager***  I found a typo in the message I just sent you.  Please post the following message and disregard the one previously sent.




From: Gould, Diane
Sent: Tuesday, January 15, 2008 10:08 AM
To: 'seaint(--nospam--at)'
Subject: Design Load Combination(s) for Prestress Slab


I have been asked to review another engineer’s justification of an existing elevated PT slab originally built circa 1977.  I cannot find PT-specific load combinations in the UBC, IBC, or ACI-318.  He is using a load combination 1.5 DL + 1.5 LL + 1.0 PT.  Does anyone know where this load combination would have come from?  Would it have been a “typical” load combination at the time for PT design?  What are the “typical” load combinations for present-day PT design?  1.0 DL + 1.0 LL + 1.0PT?  or 1.4DL + 1.7LL + 1.0PT?  1.2DL + 1.6LL + 1.0PT?  or something else??   




Diane Gould, S.E.