Pile Foundation Design
Pile Foundation Design
(OP)
I'm working on my first Pile Foundation supporting building in about 8 years...which was done at a company I no longer work for. It's a really simple building, one story, rectangular 90x60, and an Essential Facility.
Questions I have:
1) I received the soils report from the Geotech and I have vertical load capacities for 10" & 12" diameter piles hollow steel piles. Is it my responsibility to determine the steel wall thickness of the piles? I can't find it anywhere in the Geotech Report.
2) Is it more preferable to fill these with Concrete or weld a 1" thick by 14" square steel cap on them with headed nelson studs? I have my detail created for filling the pile with concrete, but was asked to show one with a steel cap as well.
3) For my lateral loads on the building, I'm assuming the Geotech will need this info to determine whether or not the Pile Spacing I have determined as adequate will work?
4) Do I need to check the steel piles for bending adequacy from my lateral load calcs?
5) Does anyone have any good references for structural notes for piles that I could look at?
Thank you!
Questions I have:
1) I received the soils report from the Geotech and I have vertical load capacities for 10" & 12" diameter piles hollow steel piles. Is it my responsibility to determine the steel wall thickness of the piles? I can't find it anywhere in the Geotech Report.
2) Is it more preferable to fill these with Concrete or weld a 1" thick by 14" square steel cap on them with headed nelson studs? I have my detail created for filling the pile with concrete, but was asked to show one with a steel cap as well.
3) For my lateral loads on the building, I'm assuming the Geotech will need this info to determine whether or not the Pile Spacing I have determined as adequate will work?
4) Do I need to check the steel piles for bending adequacy from my lateral load calcs?
5) Does anyone have any good references for structural notes for piles that I could look at?
Thank you!






RE: Pile Foundation Design
2) Filling with concrete is generally a waste of concrete. We've done the plate with nelson studs, or plate with weldable rebar.
3) Is the geotech going to check the piles for lateral (unlikely) or just provide you with soil properties that will allow you to check lateral resistances for your piles(more likely)?
4) Yes, the key here is knowing how far down into the soil you need to consider your pile is subject to bending.
5) Unfortunately I do not but someone else here might.
RE: Pile Foundation Design
RE: Pile Foundation Design
RE: Pile Foundation Design
RE: Pile Foundation Design
But that's just my thought, I doubt it would be a requirement.
RE: Pile Foundation Design
RE: Pile Foundation Design
RE: Pile Foundation Design
I'm not sure I entirely follow. How would I run my bottom bars in the grade beam past the steel pile? I suppose I could specify bar bends to occur so that the bars can transfer around? Do you have a sketch of one you have done like this?
For welding of the rebar, I was contemplating specifying that the bars be welded in a controlled environment to remove the field weld issues.
The other alternative was to use Nelson Headed studs instead of the rebar, but I like the rebar better.
RE: Pile Foundation Design
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: Pile Foundation Design
RE: Pile Foundation Design
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.