huangyhg

embeded "pole"
i'm going to embed a tube steel to act like a flag pole for house basement remediation. i already sized the member and i assume the bottom is fixed and top is free. can someone help where to start so that my assumption of fixed bottom is met? how deep i need to embed it into concrete, reinforcement around the tube steel, etc. i will have about 15 kips-ft at the base and about 9 kips of shear. thanks!

look in the wood chapter of ibc, there is a embeded pole equation that you can use. also, if you download the enercalc demo,there is an embeded pole foundation module you can use to check your work.
sorry, its not in wood. it is in chapter 18 - soils and foundations.
the pci design handbook has a solution for a steel haunch embedded in concrete. it's in section 6.9 of the 5th edition. if you take the compressive force from the couple of that solution, you get the tension your ties need to provide.
might want to check out:
halder, et al "full scale field tests on directly embedded steel poles," canadian geotechnical journal: 37 (414-437) 2000.
the aitc (american institute of timber construction) has a method of determining pole embedment. it's an interative process, but relatively easy.
swivel63,
its an interactive process - you mean you actually have to get involved!?
sorry but i couldnt resist this one, i assume you mean iterative.
csd
hi guys, i think that first you have to calc the depth of a pad footing to resit the overturning moment with the active/passive soil pressure.then you have to calculate the embedment of the steel column in the pad. you could use the enercalc for that.
lg
lol, yea that's what i meant. for tubes imbedded into concrete for railings, i had to derive the real equation when i started working.
but i found that p/a +/- mc/i came pretty close to the real answer. but this might be a lot different because we're probably talking about several feet of embedment.
what kind of base are you using? a pole embedded in the soil or embedded in a spread footing?
into spread footing. just design the concrete for the moment and look at the edge distance for break out failure i guess?

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