steel pipe embedded in cored hole in concrete filled with epoxy
steel pipe embedded in cored hole in concrete filled with epoxy
(OP)
I saw a common practice: core holes (3" dia. example) in concrete, embedded steel pipe (1.5 dia.) in the hole, and then fill the holes with cement type epoxy. My question is how to analyze this kind of pipe anchorage if there is moment, shear, tension forces at the bottom of pipe?
From link http://www.eng-tips.com/viewthread.cfm?qid=203604, I can analyze the situation between steel pipe and epoxy. How about between epoxy and concrete. I do not think the concrete surface will be roughened.
Thanks.
From link http://www.eng-tips.com/viewthread.cfm?qid=203604, I can analyze the situation between steel pipe and epoxy. How about between epoxy and concrete. I do not think the concrete surface will be roughened.
Thanks.






RE: steel pipe embedded in cored hole in concrete filled with epoxy
1) Use a combination of friction and bearing checks to demonstrate that your post and epoxy assembly engages a blob of concrete.
2) Jury rig some ACI appendix D calculations to demonstrate that the block of concrete will stay put.
If you can provide reinforcing such that step two is unnecessary, all the better. Precasters do something similar with rebar grouted into embedded corrugated sleeves. That's a little more cut and dry though.
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: steel pipe embedded in cored hole in concrete filled with epoxy
Check your results against Hilti or a competitor to validate your assumptions and calc's. If you know the material of the filler - and IF it is competently installed - then can use that company's calc's from their web page.
RE: steel pipe embedded in cored hole in concrete filled with epoxy
"Look for 3 things in a person intelligence, energy and integrity. If they don't have the last one, don't even bother with the first 2. W. Buffet
RE: steel pipe embedded in cored hole in concrete filled with epoxy
Repair mortars which are made to fill this kind of hole may not have the adhesion you need, but something like Sika Armatec might help you get bond.
RE: steel pipe embedded in cored hole in concrete filled with epoxy
RE: steel pipe embedded in cored hole in concrete filled with epoxy
Otherwise, I would try to get an understanding of the fill material - it will probably shrink away from the pipe a bit, more so with a large amount around it, which may limit the pull out resistance. I would think it could handle bending ok - it bears in compression at the top on one face, and compression on the bottom on the opposite face, it just comes down to if the infill mortar can handle the forces.
RE: steel pipe embedded in cored hole in concrete filled with epoxy