Wood Post Embedded in a Foundation Shaft?
Wood Post Embedded in a Foundation Shaft?
(OP)
I have a job where the Architect would like to embed wood posts in an unreinforced concrete shaft, maybe 5 or 6 feet deep, and have that act as the foundation. Is an acceptable method of transferring vertical loads? I've about 8 kips of load in these 8x8 wood column, as well as about 4 kips of uplift. I guess you have to rely on friction between wood column and the concrete to transfer the load?
Any guidance would be greatly appreciated.
Any guidance would be greatly appreciated.






RE: Wood Post Embedded in a Foundation Shaft?
A similar detail that I've used is to place a bed of crushed stone at the base of the post, and then run rods through the post that extend out into your concrete shaft. You'd then be looking at the dowel bearing on holes through your post, and bending/shear of the rods extending into the concrete for resisting your downforce and uplift loads.
RE: Wood Post Embedded in a Foundation Shaft?
RE: Wood Post Embedded in a Foundation Shaft?
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Wood Post Embedded in a Foundation Shaft?
I would recommend you specify the AWPA Use Category for the pressure treatment you best think meets the needs. I would say UC4C as a minimum. If the design life is long and the components are critical, you might consider UC5x. This is over 4 times more treatment than any PT post you'll get at your local lumber yard.
RE: Wood Post Embedded in a Foundation Shaft?
RE: Wood Post Embedded in a Foundation Shaft?
RE: Wood Post Embedded in a Foundation Shaft?
Does this alleviate the rotting concerns?
RE: Wood Post Embedded in a Foundation Shaft?
RE: Wood Post Embedded in a Foundation Shaft?
RE: Wood Post Embedded in a Foundation Shaft?