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Design Load Combination(s) for Prestress Slab

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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?  1.4DL + 1.7LL + 1.0PT?  or something else??   

 

Thanks,

 

Diane Gould, S.E.