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uniform surcharge from building

uniform surcharge from building

uniform surcharge from building

(OP)
Hello,

I am looking at a tunnel underneath a 3-story classroom building. Want to do a quick structural analysis on the tunnel, which is aluminum. Is there some way to estimate the surcharge from this building? I saw a number of 250 psf for r/c building per story mentioned in a post related to retaining wall design, but can't verify where the number comes from.

Could somebody help?

Thank you

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