Uplift in combined footing supported by geopiers
Uplift in combined footing supported by geopiers
(OP)
I'm designing a combined footing supported on geopiers where one column has uplift and the other does not. I've not encountered this condition before, so I'm looking for some input. The geopiers will be designed to resist the uplift, so I have to size the footing for bearing and then design it for the moments and shears. So what is an acceptable approach to analyzing it? I was thinking that I could assume that the uplift column will have zero load as the geopier takes the uplift and design the footing accordingly. Does this seem reasonable? Thanks in advance for any input!






RE: Uplift in combined footing supported by geopiers
Sounds reasonable to me. For the design case with uplift, pretend the uplifting column isn't even there. Potentially, if your resulting analysis showed that part of the footing was uplifting from the soil even without the uplift column, you could use the geopiers to pin it down to some degree.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Uplift in combined footing supported by geopiers
RE: Uplift in combined footing supported by geopiers
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Uplift in combined footing supported by geopiers
I contacted our Geopier consultant to get more information. Will follow up when I hear something.
OP,
Sorry for the hijack.
RE: Uplift in combined footing supported by geopiers
I seem to remember asking a similar question when I used Geopiers before. I believe they can embed a plate in the ground somewhere in the pier and then use rods to attach the plate the the footing and gain uplift resistance. However, I have never utilized this option. I even seem to remember them using grouted piers (don't know how this wouldn't be a "Frankie" pile) under locations that may have high compression loads
RE: Uplift in combined footing supported by geopiers