IRC 456

The density is assumed to be 2200 kg/m³.

The design strength is given in Figure 21 by

$$f_{cd}=0.67 f_c / \gamma \\$$

The tensile strength is inferred from 6.2.2 as

$$f_{ct}=0.7 \sqrt{f_c} \\$$

The elastic modulus is defined in 6.2.3.1

$$E=5 \sqrt{f_c} \\$$

The strains are defined as

	$\varepsilon_{cu}$	$\varepsilon_{ax}$	$\varepsilon_{plas}$	$\varepsilon_{max}$	$\varepsilon_{peak}$
Parabola-rectangle	0.0035	0.002	0.002
Rectangle	0.0035	0.002	$\varepsilon_{\beta}$
Bilinear
Linear				0.0035	$\varepsilon_{max}$
Non-linear				0.0035	0.0022
Popovics
EC2 Confined
AISC filled tube
Explicit	0.0035	0.002		0.0035

See also the Theory section on Concrete material models.