STRUCTURAL GRADES
Characteristic Strengths and Elastic Moduli for Glulam Grades
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Characteristic Strengths (MPa)
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Elastic Moduli (MPa)
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GL Grade
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Bending
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Tension parallel to grain
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Shear in Beam
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Compression parallel to grain
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Short modulus of elasticity parallel to the end grain
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Short duration modulus of rigidity for beams
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|
GL 12
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25
|
12.5
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3.7
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29
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11500
|
770
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|
GL 10
|
22
|
11
|
3.7
|
26
|
10000
|
670
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|
GL 8
|
19
|
10
|
3.7
|
24
|
8000
|
530
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Note: All tables in this reference guide are based upon characteristics of Glulam meeting GL8 grade. For references for higher grades than GL8 please refer to a qualified producer. There is a list of qualified producers on page 41 of this publication. Higher grades (i.e. GL10, GL12, etc) will give greater span and load carrying capability than GL8 for the same section size.
There are a range of structural grades of glue laminated timber beams produced in New Zealand in accordance with Standard AS/NZS 1328.1 - 1998. These grades were developed by the Australian and New Zealand industries to assist designers and specifiers in the selection of Glulam members and their associated design properties. The following table of structural grade characteristics is referenced from AS/NZS 1328 part 2.
