Concrete Reinforcement Materials
Design properties for concrete and reinforcement materials are selected by user.
Modulus of elasticity, E_{c} and Shear Modulus is calculated automatically according to the selected material’s design property.
Notation
E_{c } = modulus of elasticity of concrete, psi
E_{s } = modulus of elasticity of reinforcement, psi
f_{c}^{'}_{ } = specified compressive strength of concrete, psi
f_{y } = specified yield strength for nonprestressed reinforcement, psi
ε_{s } = strain value of reinforcement
ε_{y } = yield strain of reinforcement
w_{c} _{ }=_{ }density, unit weight, of normal weight concrete, lb/ft^{3}
Concrete Design Properties
Specified compressive strength
The compressive strength of the concrete material used in reinforced concrete elements is shown with f_{c}^{'}. ACI defines a minimum value of f_{c}^{'} for structural concrete and there is no limit for the maximum value. Limit values for f_{c}^{'} are shown in ACI Table 19.2.1.1.
Modulus of Elasticity
Modulus of elasticity E_{c} , for concrete is calculated as shown in ACI Equation 19.2.2.1.b.
Nonprestressed Reinforcement Bars Design Properties
For nonprestressed reinforcement bars, the stress value below f_{y} is equal to E_{s} times ε_{s} which is the value from the strain diagram at the location of the reinforcement. For strains greater than that corresponding to f_{y}, stress is constant and equals to f_{y}.
Modulus of elasticity, E_{s}, for nonprestressed reinforcement bars is considered as 29,000,000 psi.
Yield strength for nonprestressed reinforcement bars shall not exceed the values given in ACI Table 20.2.2.4a and Table 20.2.2.4.b.
Information on sizes, areas, and weights of various steel reinforcement is presented below.
Equivalance Between U.S. Customary Units, SI-METRIC, and MKS-METRIC of specified compressive strength, f_{c}^{'} and specified yield strength for reinforcement f_{y} are shown below
U.S. Customary units stress in pounds per square inch (psi) | SI-metric stress in MPA | mks-metric stress in kgf/cm^{2} | |
---|---|---|---|
f_{c}^{'} = 3000 psi | f_{c}^{'} = 21 MPa | f_{c}^{'} = 210 kgf/cm^{2} | Concrete |
f_{c}^{'} = 4000 psi | f_{c}^{'} = 28 MPa | f_{c}^{'} = 280 kgf/cm^{2} | |
f_{c}^{'} = 5000 psi | f_{c}^{'} = 35 MPa | f_{c}^{'} = 350 kgf/cm^{2} | |
f_{c}^{'} = 6000 psi | f_{c}^{'} = 40 MPa | f_{c}^{'} = 420 kgf/cm^{2} | |
f_{y} = 40,000 psi | f_{y} = 280 MPa | f_{y} = 17,600 kgf/cm^{2} | Reinforcement |
f_{y} = 60,000 psi | f_{y} = 420 MPa | f_{y} = 19,000 kgf/cm^{2} |
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