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RE: Design Load Combination(s) for Prestress Slab

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I cannot remember any different load combinations being used for PT design for ACI code. It has always been the same as for RC design with the secondary prestress moment (not the full prestress moment) added with a factor of 1.0.

At 04:09 AM 16/01/2008, you wrote:
***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.

Regards  Gil Brock
Prestressed Concrete Design Consultants Pty. Ltd. (ABN 84 003 163 586)
5 Cameron Street Beenleigh Qld 4207 Australia
Ph +61 7 3807 8022               Fax +61 7 3807 8422
email:            gil(--nospam--at)
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