Minimum spacing of bars for crack control in reinforced concrete
Minimum spacing of bars for crack control in reinforced concrete
(OP)
Hi ,
I have a sump pit to be desigend absed on ACI Code , I figured flextural reinforcement , also checked the minimum spacing for cracks based on the stress in felxtural bars .
The minimum spacing of flextural bars are given in ACI 318 cl 10.6.4 ...
But can anyone tell me did i miss any criteria for minimum spacing of bars other than given above . Earlier times when i designed sump pit the minimum spacing of bars where restricted to 150 mm . I dont know the reason still. can anybody clarify me regarding this .
I have a sump pit to be desigend absed on ACI Code , I figured flextural reinforcement , also checked the minimum spacing for cracks based on the stress in felxtural bars .
The minimum spacing of flextural bars are given in ACI 318 cl 10.6.4 ...
But can anyone tell me did i miss any criteria for minimum spacing of bars other than given above . Earlier times when i designed sump pit the minimum spacing of bars where restricted to 150 mm . I dont know the reason still. can anybody clarify me regarding this .






RE: Minimum spacing of bars for crack control in reinforced concrete
see this link as example, you may want to download pca concrete tank design. i think it's free.
http://civil.colorado.edu/~silverst/cven4830/Recta...
RE: Minimum spacing of bars for crack control in reinforced concrete
My standard sump detail shows the bars at 150 which I believe is an ACI350 thing. But then smaller pits use 6" walls which I believe is not compliant with ACI350. My take is that sump pits do not need to be waterproof. They just need to be durable in an often wet environment.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Minimum spacing of bars for crack control in reinforced concrete
This could be accomplished with a wrap / WP membrane thought.
RE: Minimum spacing of bars for crack control in reinforced concrete
see quote from ACI 350 below with highlights
RE: Minimum spacing of bars for crack control in reinforced concrete
RE: Minimum spacing of bars for crack control in reinforced concrete
RE: Minimum spacing of bars for crack control in reinforced concrete
I was thinking it should be "maximum" also but decided to not be as pedantic as usual and let it slide!