BS 8110

The density of normal weight concrete is given in section 7.2 of BS 8110-2 as 2400 kg/m³.

The design strength is given in Figure 3.3 by

$$f{ct}=0.67 \space f_c/ \gamma \\$$

The tensile strength is given in 4.3.8.4 as

$$f_{ct} =0.36 \space \sqrt{f_c} \\$$

but Figure 3.1 in BS 8110-2 implies a value of 1MPa should be used at the position of tensile reinforcement.

The elastic modulus is given in Equation 17

$$E= 20 + 0.2 f_c \\$$

The strains are defined as:

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

$$\varepsilon_u= \begin{cases} 0.0035 \space \space \space \space \space \space \space \space \space \space \space f_c \leq 60 MPa\\ 0.0035-0.001 \times \frac{(f_c-60)}{50} \\ \end{cases}$$

$$\varepsilon_{RP}=2.4 \times 10^{-4} \space \sqrt{\frac{f_c}{\gamma}} \\$$

See also the Theory section on Concrete material models.