Foundation on slope for metal building 1

I would approach this using a footing buried below existing finished grade and a tall pedestal to support the PEMB columns. The intent of this is to avoid placing column surcharge loading onto the retaining wall. Between the PEMB columns around the perimeter, I would have a retaining restrained retaining wall (assuming slab is present across the building) and I would look at using a grade beam (larger than wall thickness as required) at the top to deal with any lateral loads on the columns. I suspect you may not need much being such a small PEMB. The cut in the middle of the building is a tension tie beam, basically it's concrete enclosing the reinforcing required for the thrust of the PEMB columns. If you could get hairpins to work I would try that first and put them in the slab, thereby not needing the tie beam, however if the hairpins wern't sufficient I would use a tie beam. The tie beam typically has reinforcing that wraps the PEMB anchors and this determines depth.

MCORTEZ - With a 12", well reinforced floor, I don't consider this to be a typical PEMB:



Those specs imply that significant floor loading is possible. The "stem wall" (actually a retaining wall) must resist this surcharge loading applied to the floor behind it. This surcharge is in addition to the retained backfill loading.

Second, the slab is partly on backfill and partly on undisturbed soil... potentially tricky to minimize differential settlement.

Third, design of the upper retaining wall should take into account that it's construction may not be straight forward. Excavation into an exiting slope is required.

Work closely with a geotechnical engineer on this project.

Something like...

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/raw/upload/v1636507557/tips/SDF_m4d57m.dwg[/url]

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1636507557/tips/SDF_a7mmbz.pdf[/url]

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

The retaining wall will have to be constructed and backfilled before the slab is poured on top. If you "backfill" it with something that doesn't put pressure on the wall like geofoam of flowable fill, you won't have to have the massive footing that a cantilever wall requires.