Concrete Material Properties

You can specify concrete compressive strength ( f'_c ), weight, density and modulus of elasticity when assigning concrete members (refer to the RAM Modeler manual). You can also select the option to have the program calculate the member's modulus of elasticity. Where this option is selected the concrete modulus is calculated according to the following equations:

ACI 318

E_{c} = w_{c}^{1.5} 33 \sqrt{{f^{'}}_{c}}

(psi)

for values of w_c (unit weight of concrete) between 90 and 160 lb/ft³ (for ACI 18-08 and later) and between 90 and 155 lb/ft³ (for ACI 318-95, 99, 02, and 05).

f'_c compressive strength of concrete in psi.

Eurocode:ENV 1992-1-1:2004

E_{c} = 22 {(\frac{f_{c k} + 8}{10})}^{0.3}

(kN/mm²

f_ck characteristic cylinder compressive strength of concrete in N/mm²

Canadian Code: A23.3-10

E_{c} = (3, 300 \sqrt{{f^{'}}_{c}} + 6, 900) {(\frac{γ_{c}}{2, 300})}^{1.5}

for values of γ_c (unit weight of concrete) between 1,500 and 2,500 kg/m³.

British Code: BS8110 - Part 2

E_{c} = 20 + 0.2 f_{c u}

(kN/mm²)

for concrete weight between 2,160 and 2,480 kg/m³.

Australian Code: AS/NZS 1170.1

AS 3600-09

E_{c} = ρ^{1.5} 0.043 \sqrt{f_{c m i}}

f_cmi ≤ 40 MPa

E_{c} = ρ^{1.5} (0.024 \sqrt{f_{c m i}} + 0.12)

f_cmi > 40 MPa

AS 3600-01

E_{c} = ρ^{1.5} 0.043 \sqrt{f_{c m}}

AS 3600 6.1.2 (a)

where

ρ	=	the concrete density (for normal-weight concrete, taken not less than 2,400 kg/m³)
f_cm	=	the mean value of cylinder strength (calculated from Table C6.1.2 base on the given compressive concrete strength, f_c'
f_cmi	=	the mean value of the in situ compressive strength of concrete at the relevant age (calculated from Table 3.1.2 based on the given compressive concrete strength, f_c'

China GB 50009-2001

See " British Code: BS8110 - Part 2 "

Hong Kong

See " British Code: BS8110 - Part 2 "