Down pipes cast in concrete columns
Down pipes cast in concrete columns
(OP)
Hey all,
I've been asked to design a 700 long by 300 wide column (4.5m tall) with a 150 diameter down-pipe cast in the middle. This scenario seems a little odd to me but hey that's architects. Anyhow, I have no problems with do the basic moment/axial analysis and checking the reduced web shear capacity. I was just wondering whether anyone had done anything similar and come across any shrinkage/restraint issues due to the PVC pipe?
Thanks
I've been asked to design a 700 long by 300 wide column (4.5m tall) with a 150 diameter down-pipe cast in the middle. This scenario seems a little odd to me but hey that's architects. Anyhow, I have no problems with do the basic moment/axial analysis and checking the reduced web shear capacity. I was just wondering whether anyone had done anything similar and come across any shrinkage/restraint issues due to the PVC pipe?
Thanks






RE: Down pipes cast in concrete columns
RE: Down pipes cast in concrete columns
The problem is not so much the actual analysis but rather the compaction of the concrete in such slender sections.
Ensure cover to the downpipe is at least the same as everywhere else.
There may be fire rating issues with such thin parts.
Also if this is in a seismic area then this takes out a very big chunk of your confined concrete.
Not saying that this sort of thing cannot be done just that you need to consider everything, including those things that you normally take for granted.
RE: Down pipes cast in concrete columns