Too Much Reinforcing in Concrete Wall?
Too Much Reinforcing in Concrete Wall?
(OP)
I am working on a WWTP where the precaster would like to keep a wall thickness to 14". I can make this thickness work for the loads, however, the reinforcing is becoming quite heavy on the inside face mat. I would need to use #9 bar @ 4" o.c. Although this still falls below the maximum steel ratio and the spcaing of the bars is wide enough to allow the largest aggregate to easily pass through I am having concerns about this configuration. What are your thoughts? Is there a good reason that I should insist on going with a thicker wall?
Thanks
Thanks






RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
I suppose I could go to a 10 bar but I understand that they are much harder to find in our area and the precaster does not stock them.
Thanks for the quick response!
RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
After talking with the precaster it sounds like we have the option to go with a ribbed wall as well. This may actually be a cheaper option than this heavily reinforced flat wall.
Thank you all for the input.
RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
Besides, in no different in you providing a design for a contractor to build. The contractor has a responsibility to build it correctly, per your design, just as the precaster is responsible for his quality control.
PMR06, not all precasters have the ability to use prestressed or post-tensioned tendons in there products. As an engineer though, you should encourage your precaster to explore prestressing and post-tensioning. There are many benefits to using these methods.
RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
For f'c=5ksi and fy=60ksi, I come up with a rho max (or 0.75 rho balanced) of 0.0252. You are right, his rho is 0.021, but it is not over-reinforced.
RE: Too Much Reinforcing in Concrete Wall?
RE: Too Much Reinforcing in Concrete Wall?
The tensile strain is 0.0051 so 10.3.5 isnt violated.