how to calc transp moment of I for reinf conc filled-steel pipe pile
how to calc transp moment of I for reinf conc filled-steel pipe pile
(OP)
I need to know how to calculate the transposed moment of intertia for a steel pipe pile, filled with reinforced concrete that will be laterally loaded (will have flexure). I have tried n=Es/Ec, then n*As=(pi/4)*(Dtr^2 - D^2) to get the Dtr (transposed diam). then using Dtr to calculate Itr. Then used the E for concrete to input into L-pile.
Someone else suggested 2007 AASHTO 6.9.5.1, but this is for columns with out flexure. 6.12.2.3 doesn't give formulas for I.
Am I missing something here? Any help would be appreciated.
Someone else suggested 2007 AASHTO 6.9.5.1, but this is for columns with out flexure. 6.12.2.3 doesn't give formulas for I.
Am I missing something here? Any help would be appreciated.






RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
BA
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
BAretired's formula transforms the concrete to steel. I don't know why you think it gives you less than either, it is I(pipe) plus I(concrete transformed to steel equivalent).
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
I(transformed) = I(pipe)*Es/Ec + I(concrete)
BA
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
E(conc)I(conc) = E(steel)I(steel)
You "transform" the piece by dividing one of the E's to the other side.
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
doesnt anyone google anymore?
ht
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
http://www
BA
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
I think I(transformed) = I(pipe)*Es/Ec + I(concrete) is what I want because a program that caclulates this internally is giving me something very similar. Thanks for all of your help.
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
BA
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
There doesn't need to be strain compatibility if you're just algebraicly adding the MOI's. You just need to make sure they deflect together (so they share load according to their relative stiffnesses). This behavior implies that there is slip between the surfaces. It's all a moot point though, because, as csd points out, the concrete will crack.
RE: how to calc transp moment of I for reinf conc filled-steel pipe pile
If it was me though, I would go with BA's suggestion and consider only the pipe and regard the concrete as gravy.
Michael.
Timing has a lot to do with the outcome of a rain dance.