Material Properties
Calculate mechanical properties of concrete and view standard metric reinforcing steel data based on ACI 318M-11.
Based on ACI 318-11 and McCormac & Brown (9th Ed), properties are calculated using SI units. The Modulus of Elasticity ($E_c$) determines the stiffness of the concrete elements.
$$ E_c = w_c^{1.5} \times 0.043 \times \sqrt{f'_c} $$
The Modulus of Rupture ($f_r$) represents the tensile strength of concrete in flexure before cracking occurs.
$$ f_r = 0.7 \sqrt{f'_c} $$
The factor $\beta_1$ relates the depth of the equivalent rectangular compressive stress block ($a$) to the neutral axis depth ($c$). For $f'_c \le 30$ MPa, $\beta_1 = 0.85$. For $f'_c > 30$ MPa, it reduces by 0.008 for every MPa over 30, but not less than 0.65.
Standard SI metric bar sizes based on ASTM A615M. Steel Modulus of Elasticity ($E_s$) is taken as 200,000 MPa.
| Bar Size (#) | Diameter (mm) | Area (mm²) | Mass (kg/m) |
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