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Service Load Factor on PIP and ASCE for Petrochemicals

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danzrg_05

Civil/Environmental
Jun 5, 2020
1
Hello!

I'm having an issue trying to understand why this difference exists between ASCE Guidelines for Seismic Design on Petrochemical Facilities and PIP STC01015.

On ASCE, recommended load comb is:
0.9Ds + 0.9Do + Af + To + 0.7Eo (Table 5.1, comb 4)

On PIP (2007), it says:
0.9Ds + 0.6Do + Af + To + 0.7Eo (Table 7, comb 4a)

I cant' find the reason for using 0.6 or 0.9. On PIP, there's a note saying "0.6Do is used as an approximation of De", but it's a combination for the operating weigth, not empty one.
Anybody has any information on this?
Thanks!
 
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Here is the 2017 version of PIP which seems to get rid of this:
PIP_Load_Cases_lkrmre.jpg
 
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