Geotechnical report interp

[karimom]

I got a geotech. report with a factored ULS of 2ksf and a geotech. resistance factor of 0.5 .

For my model, I would be using the ultimate allowable as 4ksf with a factor of safety of 2 based on ASD correct?

 

[jayrod12]

My first response as always, ask the geotech that prepared the report.

However that being said, in my mind not quite, because allowable you aren't factoring your loads. So depending on your building type (dead weight versus live load ratio) your safety factor is more likely to be in the range going to need to be in the range of 2.7 to 3. Therefore I'd be looking at an allowable bearing pressure closer to 1.5ksf to compare to your allowable loads.