Timber · Glued laminated timber, combined · orthotropic

GL20c

Name: GL20c — material properties (EN 14080:2013)
Creator: BadgerMecX

EN 14080:2013 · strength class

GL20c is a combined glued laminated timber class to EN 14080:2013. Its characteristic bending strength is 20 MPa. Along the fibres E₁ = 10.4 GPa; across them E₂ = 0.3 GPa.

Record: glulam-gl20c
Library: v1.1.0
Properties: 15
Sources: 1
Build check: passed ✓
Viewing as: guest

E₁ · Modulus, direction 1 10.4GPa mean^[1]

f_m,k · Bending strength 20MPa char^[1]

f_t,0,k · Tension parallel to grain 15MPa char^[1]

ρ · Density 390kg/m³ mean^[1]

Elastic constants

orthotropic

Symbol	Property	Value	Unit	Basis	Ref.
E₁	Modulus, direction 1 ⓘ E_0,g,mean	10.4	GPa	mean	[1]
E₀,₀₅	Modulus parallel to grain, 5 % fractile	8.6	GPa	char	[1]
E₂	Modulus, direction 2 ⓘ E_90,g,mean	0.3	GPa	mean	[1]
E₃	Modulus, direction 3 ⓘ E_90,g,mean	0.3	GPa	mean	[1]
G₁₂	Shear modulus 1-2 ⓘ G_g,mean	0.65	GPa	mean	[1]
G₁₃	Shear modulus 1-3 ⓘ G_g,mean	0.65	GPa	mean	[1]
G₀₅	Shear modulus, 5 % fractile	0.54	GPa	char	[1]

Physical, thermal and electrical

at 20 °C

Symbol	Property	Value	Unit	Basis	Ref.
ρ	Density	390	kg/m³	mean	[1]
ρ_k	Density, characteristic (5 % fractile)	355	kg/m³	char	[1]

Strength

a band applies up to and including its upper limit

Symbol	Property	Value	Unit	Basis	Ref.
f_m,k	Bending strength	20	MPa	char	[1]
f_t,0,k	Tension parallel to grain	15	MPa	char	[1]
f_t,90,k	Tension perpendicular to grain	0.5	MPa	char	[1]
f_c,90,k	Compression perpendicular to grain	2.5	MPa	char	[1]
f_v,k	Shear strength	3.5	MPa	char	[1]
f_c,0,k	Compression parallel to grain	18.5	MPa	char	[1]

Notes

EN 338 and EN 14080 give no Poisson's ratios; a 3D analysis needs them from another source.

Sources

every value names one

EN 14080:2013, Timber structures — Glued laminated timber, Tables 4 and 5Copies checked: 1, 2, 3, 4

min product standard minimum char characteristic design code value for design typical datasheet or textbook derived worked out here, formula shown

Cite this page

for reports and papers

BadgerMecX Materials (2026). GL20c — material properties, EN 14080:2013. Library v1.1.0, record glulam-gl20c. https://badgermecx.com/materials/glulam-gl20c/ (accessed 2026-10-08).

@misc{badgermecx_glulamgl20c,
  title  = {GL20c -- material properties, EN 14080:2013},
  author = {{BadgerMecX Materials}},
  year   = {2026},
  note   = {Library v1.1.0, record glulam-gl20c},
  url    = {https://badgermecx.com/materials/glulam-gl20c/}
}

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