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This practice details the standard procedures for establishing the allowable properties for structural glued laminated timber (glulam). Allowable properties include: stress indexes; stress modification factors associated with slop of grain; stresses for bending, tension and compression parallel to the grain; horizontal shear; compression perpendicular to the grain; radial tension and compression stresses in curved members; grade adjustment factors; modulus of elasticity; and modulus of rigidity. This practice is limited to the calculation of allowable properties subject to the given procedures for the selection and arrangement of grades of lumber of the species considered. It does not cover the requirements for production, inspection and certification, but in order to justify the allowable properties developed using procedures in this practice, manufacturers must conform to recognized manufacturing standards.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This practice covers the procedures for establishing allowable properties for structural glued laminated timber. Included are the allowable stresses for bending, tension and compression parallel to the grain, horizontal shear, compression perpendicular to the grain, and radial tension and compression in curved members. Also included are modulus of elasticity and modulus of rigidity.
1.3 Requirements for production, inspection and certification are not included, but in order to justify the allowable properties developed using procedures in this practice, manufacturers must conform to recognized manufacturing standards. Refer to ANSI/AITC A190.1 and CSA O122.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D9 Terminology Relating to Wood and Wood-Based Products
D143 Test Methods for Small Clear Specimens of Timber
D198 Test Methods of Static Tests of Lumber in Structural Sizes
D245 Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber
D2395 Test Methods for Specific Gravity of Wood and Wood-Based Materials
D2555 Practice for Establishing Clear Wood Strength Values
D2915 Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products
D4761 Test Methods for Mechanical Properties of Lumber and Wood-Base Structural Material
D5456 Specification for Evaluation of Structural Composite Lumber Products
D6570 Practice for Assigning Allowable Properties for Mechanically Graded Lumber
E105 Practice for Probability Sampling of Materials
Other StandardsCSA O122 Structural Glued Laminated Timber Available from Canadian Standards Association (CSA), 5060 Spectrum Way, Mississauga, ON L4W 5N6, Canada, http://www.csa.ca.
ICS Number Code 79.060.01 (Wood-based panels in general)
ASTM D3737-12, Standard Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam), ASTM International, West Conshohocken, PA, 2012, www.astm.orgBack to Top