adding internal support for a one way single span slab
adding internal support for a one way single span slab
(OP)
Hi
I have a question here, a builder build a single span one way slab himself, the slab is 150mm, and he placed one layer main reo bar at mid of slab. But it is not strong enough to take the design loads. So he is thinking adding some internal supports.
Can any one see if it is workable? from logic, it seems fine. If the support close enough to produce the max +ve and -ve bending less than the capacity, then that is it.
But my question is, because it is only one lay of main bar, and this bar need to use to resist +ve & -ve bending, it will means 2nd curvature create, is it still OK? (I really no idea this point, normally, I put +ve bar to control +ve bending and -ve bar to control -ve bending).
Also, the cracking is also my concern.
Your comments will be helpful.
I have a question here, a builder build a single span one way slab himself, the slab is 150mm, and he placed one layer main reo bar at mid of slab. But it is not strong enough to take the design loads. So he is thinking adding some internal supports.
Can any one see if it is workable? from logic, it seems fine. If the support close enough to produce the max +ve and -ve bending less than the capacity, then that is it.
But my question is, because it is only one lay of main bar, and this bar need to use to resist +ve & -ve bending, it will means 2nd curvature create, is it still OK? (I really no idea this point, normally, I put +ve bar to control +ve bending and -ve bar to control -ve bending).
Also, the cracking is also my concern.
Your comments will be helpful.






RE: adding internal support for a one way single span slab
RE: adding internal support for a one way single span slab
Perhaps widening the internal support will help reduce the moment peack a bit and minimise the cracking, but there still will be a lot more cracking than usual.
csd
RE: adding internal support for a one way single span slab
If cracking is likely to occur could you sawcut a joint over the support?
RE: adding internal support for a one way single span slab