Embedded pipes in an RC slab
Embedded pipes in an RC slab
(OP)
Hello,
I have a 300mm thick flat slab (without drop panels) which is to contain a series of plastic pipes for cooling the floor. The pipes are 25mm diameter and are spaced at 100mm centers. They will be situated in the center of the slab (suspended from the top reinforcement I expect), so will be located sufficiently away from both tension zones.
I am unsure how to check the impact of the pipes on the slab's capacity for bending and shear. I don't want to just reduce the sectional depth by the pipes diameter as that wouldn't be the right way to approach it.
Does any one have any thoughts, or experience with this issue?
Any help would be much appreciated
Thanks
I have a 300mm thick flat slab (without drop panels) which is to contain a series of plastic pipes for cooling the floor. The pipes are 25mm diameter and are spaced at 100mm centers. They will be situated in the center of the slab (suspended from the top reinforcement I expect), so will be located sufficiently away from both tension zones.
I am unsure how to check the impact of the pipes on the slab's capacity for bending and shear. I don't want to just reduce the sectional depth by the pipes diameter as that wouldn't be the right way to approach it.
Does any one have any thoughts, or experience with this issue?
Any help would be much appreciated
Thanks
RE: Embedded pipes in an RC slab
However looking at it from first principles, keep it along the neutral axis where bending stress is zero. The only other thing to worry about then is shear. You can check the reduced cross sectional area quite easily for shear but for a slab I can’t imagine you’ll have any difficulty in this regard.
Similarly if the slab is a diaphragm subject to axial loads, again you can check this easily but the % reduction in cross sectional area is tiny from what you’re saying above.
I’m assuming above that this is not a PT slab.
RE: Embedded pipes in an RC slab
RE: Embedded pipes in an RC slab
Alternatively for a single span slab, I would keep the pipes out of the compression block (somewhere between the tension reinforcement and the compression block). If you had to locate the pipes in the compression block, I would calculate the stress "lost" from the compression block due to the pipes and increase the tension reinforcement by that amount, since C = T.
RE: Embedded pipes in an RC slab