ACI

The density of normal weight concrete is assumed to be 2200 kg/m³.

The design strength is given in 22.2.2.4.1 by

$$f_{cd}=0.85 \space f_c \\$$

The tensile strength is given in Equation 9-10 by

$$f_{ct}=0.62\sqrt{f_c} \\$$

$$f_{ct}=7.5 \space \sqrt{f_c} \space \space \space \space \space \space \text{(US units)} \\$$

The elastic modulus is given in 8.5.1 as

$$E=4.7 \space \sqrt{f_c} \\$$

$$E=57000 \space \sqrt{f_c} \space \space \space \space \space \space \text{(US units)} \\$$

The strains are defined as:

	$\varepsilon_{cu}$	$\varepsilon_{ax}$	$\varepsilon_{plas}$	$\varepsilon_{max}$	$\varepsilon_{peak}$
Parabola-rectangle	0.003	$\varepsilon_{cu}$	$\small (1-3\beta)\varepsilon_{cu}$
Rectangle	0.003	$\varepsilon_{cu}$	$\varepsilon_{\beta}$
Bilinear	0.003	$\varepsilon_{cu}$	$\small (1-2\beta)\varepsilon_{cu}$
Linear				0.003	$\varepsilon_{max}$
Non-linear
Popovics				0.003	$\varepsilon_{pop}$
EC2 Confined
AISC filled tube
Explicit	0.003	$\varepsilon_{cu}$		0.003

See also the Theory section on Concrete material models.