Need to document bearing weight of PVC Coated GRC

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JAbrahams5

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Location
Colorado
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Master Electrician / Project Engineer
I have been asked by a GC to route some duct bank underneath of some column footers. The structural designers have asked me to document the bearing strength of the raceways (4" PVC coated GRC) as they fear the structural weight will crush the conduits. Does anyone know where these types of ratings can be found? I looked for an ATSME chart but had no luck. Telling them it didn't matter because I'll have already pulled the wire didn't work Haha!
 
I’d show them the burial depth requirements for under driveways in the NEC. They have taken all this into consideration ,that away you don’t have to chase down all this info from the manufacture’s.
 
Thank you for the input. I think that is a great idea and doesn't give the designers a chance to argue math!
 
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