CSA A23.3 / CSA S6

The density of normal weight concrete is assumed to be 2300 kg/m³; see 8.6.2.2 (A23.3) and 8.4.1.7 (S6).

The design strength is given in 10.1.7 by

$$f_{cd} = max (0.67,0.85-0.0015 f_c) \varphi f_c \\$$

The tensile strength is given in Equation 8.3 (A23.3) and 8.4.1.8.1 in (S6)

$$f_{ct} =0.6 \sqrt{f_c} \space \space \space \space \space \space \text{(for CSA A23.3)} \\$$

$$f_{ct} =0.4 \sqrt{f_c} \space \space \space \space \space \space \text{(for CSA S6)} \\$$

For normal weight concrete the modulus is given in A23.3 Equation 8.2.

$$E= 4.5 \sqrt{f_c} \\$$

and in CSA S6 8.4.1.7

$$E= 3.0 \sqrt{f_c} +6.9 \\$$

The strains are defined as

	$\varepsilon_{cu}$	$\varepsilon_{ax}$	$\varepsilon_{plas}$	$\varepsilon_{max}$	$\varepsilon_{peak}$
Parabola-rectangle	0.0035	$\varepsilon_{cu}$	$(1-3\beta)\varepsilon_{u}$
Rectangle	0.0035	$\varepsilon_{cu}$	$\varepsilon_{\beta}$
Bilinear	0.0035	$\varepsilon_{cu}$	$(1-2 \beta)\varepsilon_u$
Linear				0.0035	$\varepsilon_{max}$
Non-linear
Popovics				0.0035	$\varepsilon_{pop}$
EC2 Confined
AISC filled tube
Explicit	0.0035	$\varepsilon_{cu}$		0.0035

See also the Theory section on Concrete material models.