minimum reinforcement
minimum reinforcement
(OP)
I have a slab which is 6 feet thick. Using 50 ksi bars, i need to put minimum steel percent = 0.2% for shrinkage crack control. This is extremely high (because slab is so thick)and my design for moment does not require even 1/10th reinforcemnt of that.
1. Do I still have to give 0.2% steel even if I use expansive concrete?
2. Does the minimum steel criteria still hold true for slabs of such depths?
3. Does the minimum steel also include negative reinforcement too?
4. Is there a specific way to place the shrinkage crack control reinforcement? evenly distirbuted/at bottom/at top???
1. Do I still have to give 0.2% steel even if I use expansive concrete?
2. Does the minimum steel criteria still hold true for slabs of such depths?
3. Does the minimum steel also include negative reinforcement too?
4. Is there a specific way to place the shrinkage crack control reinforcement? evenly distirbuted/at bottom/at top???





RE: minimum reinforcement
RE: minimum reinforcement
RE: minimum reinforcement
RE: minimum reinforcement
RE: minimum reinforcement
If so, I do not think provisions of shinkage reinforcement will be binding on you. You can design the slab for actual thickness, say 2', and provide minimum reinforcement on that. The additional thickness of 4' of concrete can then be treated as sacrificial dead load and an increased margin of safety. However you can also add some surface reinforcement on top.
Ciao.
RE: minimum reinforcement
flamby, my present design is almost like what you have suggested. thanks again.