C18 (EN 338) - Design Values

C18 (EN 338) is a dimensional lumber grade with reference design values to EN 338:2016. In Eurocode 5 terms its characteristic bending strength fm,k is 18 N/mm², compression parallel fc,0,k is 18 N/mm², and mean modulus E0,mean is 9 kN/mm² (EN 338 / EN 14080). Values are shown before adjustment factors; apply the relevant NDS C-factors or EC5 k_mod and γ_M for your load case.

fm,k (bending): 18 N/mm²
fc,0,k (compr.): 18 N/mm²
E0,mean: 9 kN/mm²

Characteristic values (EN 338 / EN 14080)

fm,k	Bending strength	18 N/mm²
ft,0,k	Tension parallel	11 N/mm²
ft,90,k	Tension perpendicular	0.4 N/mm²
fc,0,k	Compression parallel	18 N/mm²
fc,90,k	Compression perpendicular	2.2 N/mm²
fv,k	Shear strength	3.4 N/mm²
E0,mean	Mean MOE parallel	9 kN/mm²
E0,05	5th-percentile MOE	6 kN/mm²
Gmean	Mean shear modulus	0.56 kN/mm²
ρk	Characteristic density	320 kg/m³
ρmean	Mean density	380 kg/m³

Source: EN 338:2016. Reference values are shown before adjustment factors (NDS C-factors / EC5 k_mod, γ_M) - apply these per your load case in design.

Other Dimensional Lumber grades

Douglas Fir-Larch, Select Structural Douglas Fir-Larch, No. 1 Douglas Fir-Larch, No. 2 Douglas Fir-Larch, No. 3 Hem-Fir, Select Structural Hem-Fir, No. 1 Hem-Fir, No. 2 Spruce-Pine-Fir, Select Structural Spruce-Pine-Fir, No. 1/No. 2 Spruce-Pine-Fir, No. 3

Rate this

No ratings yet

Loading…