I have a question that has been bugging me for awhile that I hope someone can give me some guidance on.
Here are the facts:
1) A lightweight pre-engineered building (say 20 psf) bearing on a pile supported mat that supports tanks and equipment (say 500 psf+).
2) UBC seismic zone 3.
3) Point of fixity of piles is 20 ft below grade, per geotech.
Would this structure have to be considered a "cantilevered column building system" (R=2.2)? I was wondering if I would be released from this low R value because the structure is essentially just an equipment foundation.
Also, if I have to use R=2.2 for the foundation, would the light metal building shell have to be designed with R=2.2 as well (unless it can be shown to have 10 times the metal building stiffness)?
Thank you for your thoughts.
Kevin Harris, P.E.
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