F min 0 0015.
Minimum concrete wall reinforcement aci.
The minimum ratio of required reinforcement is.
In final design corner regions will probably require a higher ratio of reinforcement due to moments from 2 way action.
Reinforced concrete cantilever retaining wall analysis and design aci 318 14 reinforced concrete cantilever retaining walls consist of a relatively thin stem and a base slab.
Try 4 bars at 12 inches.
The rcc member which is cast against the earth and exposed to earth the concrete cover should be not less than 3 inches.
F min 0 002 for f y 40 000 psi s min 0 0018 for f y 60 000 psi for walls.
When the strain in the reinforcement is 0 005 or greater the section is tension controlled.
Values of tension ldand tension lap splice lengths in the tables are based on the provisions in aci 12 2 2.
F min 0 0025.
Here i ll discuss the minimum concrete cover as specified in aci code.
The temperature reinforcement shall not be less than inch at nine 9 inch center to center.
Thus a 5 bars which provide an area of 0 31 in2 would be needed.
All tabulated data are for grade 60 420 reinforcing bars in normalweight concrete with the concrete compressive strength f c ranging from 3000 to 8000 psi 21 to 56 mpa.
The tables use the terminology cases 1 and 2.
The stem may have constant thickness along the length or may be tapered based on economic and construction criteria.
Use on both faces.
Minimum reinforcement required is 0 25 of gross cross section.
So for a 12 inch thick by 12 inch wall or slab section the amount of steel needed to control shrinkage and temperature cracks is 0 0018 x 12 x 12 0 26 in2.
Aci clear cover requirements.
The reinforcement ratio ρ must be less than a value determined with a concrete strain of 0 003 and tensile strain of 0 004 minimum.
Minimum cover requirements for nonprestressed cast in place concrete construction are given in table 20 6 1 3 1 of aci 318 14 building code requirements for structural concrete.
Reinforcing bars are placed in a concrete member with a minimum concrete cover to protect it from weather fire and other effects.
Reinforcement the minimum ratio of reinforcement area to gross concrete area is 0 0018.
Concrete which is not cast against earth but exposed to earth or weather the concrete cover should be.