Posts Embedded in Concrete
Posts Embedded in Concrete
(OP)
thread507-8985: Embedment in Concrete
I have seen several threads on the design of posts embedded in concrete but none seem to list a design procedure or method of analysis. The post could be wood or steel. ASABE EP486 has a procedure for posts embedded in the ground. Seems this procedurre would be reasonable to use if there was a value listed, or one you could assume for the lateral soil reaction for concrete. My geotechnical background is rather weak so I don't have a feel for these values or what they mean. Has anyone found a good design procedure? Lina posted this same question a couple of times.
I have seen several threads on the design of posts embedded in concrete but none seem to list a design procedure or method of analysis. The post could be wood or steel. ASABE EP486 has a procedure for posts embedded in the ground. Seems this procedurre would be reasonable to use if there was a value listed, or one you could assume for the lateral soil reaction for concrete. My geotechnical background is rather weak so I don't have a feel for these values or what they mean. Has anyone found a good design procedure? Lina posted this same question a couple of times.






RE: Posts Embedded in Concrete
The good news is that it's actually much simpler than a post in soil: You have the advantage of being able to consider your post as imparting triangular pressure distributions onto the concrete. Then you ensure that you have the steel to close any potential cracks. Simple.
Cheers,
YS
P.S. Sorry, no references that I can think of, other than ones about embedded items in concrete and preventing possible deterioration/interactions. I'm happy to post a sketch if it will help...
B.Eng (Carleton), P.Eng (Ontario), MIPENZ (Structural-New Zealand)
Working in Canada, and missing my adoptive New Zealand family... at least I brought the little Kiwi with me!
RE: Posts Embedded in Concrete
For lateral loads the material of your post makes no difference to the soil behaviour. It is the width/deth that matters as this determines if it should be treated as a stiff pile or a flexible one.
RE: Posts Embedded in Concrete
Looking forward to your reply,
YS
B.Eng (Carleton), P.Eng (Ontario), MIPENZ (Structural-New Zealand)
Working in Canada, and missing my adoptive New Zealand family... at least I brought the little Kiwi with me!
RE: Posts Embedded in Concrete
I am in agreement with you that the stress distribution will be triangular. The bigger question I think is where is the neutral axis? There is a point where increasing the embeddment depth no longer is effective. This must be governed by the stiffness of the post compared to the stiffness of the effective concrete section. I think I can make a reasonable assumption on a effective width of concrete to use. The effective length, in the direction of the load might be controlled by the ties or reinforcing you mention. ASABE uses an equation for dmax or the maximum embedment based on the EI of the post. I need to do the same...somehow.
RE: Posts Embedded in Concrete
RE: Posts Embedded in Concrete
RE: Posts Embedded in Concrete
That is just what I was looking for. The PCI Handbook was sitting right on the bookshelf in front of me.
RE: Posts Embedded in Concrete