minimum reinforcement for concrete duct bank

[h-badawy]

Dear experts

shall we follow ACI-318 code for minimum reinforcement of slab for concrete duct banks or is there any topics i can follow for this issue?

Thank you

 

[rapt]

What level of crack control do you need?

 

[MotorCity]

Typically, duct banks are not considered structural concrete and as such are not bound by the minimum reinforcement requirements in ACI. I have seen many with little or no reinforcement perform very well. If it were my design, I would provide the minimum reinforcement for crack control even if it was not required by code

 

[SteelSlugged]

I agree with the others. Chapter 7 of ACI 318 lists minimum area of shrinkage and temp reinforcement. The values vary between .14% and .2% depending on the grade of steel used. Also, don't forget your minimum clear cover and maximum reinforcement spacing.

 

[TehMightyEngineer]

Unless they're deeply buried or very large I would just put in temp. & shrinkage rebar in a single layer, middle of the walls/slab. If they're getting driven over with little soil cover I might throw in some distribution rebar in the top and bottom slabs.

Professional and Structural Engineer (ME, NH, MA)
American Concrete Industries

http://www.americanconcrete.com