ASTM D3737

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. Scope

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.

1.2 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.

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 0122.

1.4 The values stated in inch-pound units are to be regarded as standard.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents

Other Standards
CSA0122 Structural Glued Laminated Timber
ASTM Standards
D198 Test Methods of Static Tests of Lumber in Structural Sizes
D2395 Test Methods for Specific Gravity of Wood and Wood-Based Materials
D245 Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber
D2555 Practice for Establishing Clear Wood Strength Values
D2915 Practice for Evaluating Allowable Properties for Grades of Structural Lumber
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
D9 Terminology Relating to Wood and Wood-Based Products
E105 Practice for Probability Sampling Of Materials

Index Terms

clear wood; glulam; lumber; structural glued laminated timber; timber; Compression testing--wood/wood products; Grading--wood products; Shear testing--wood products; Strength--wood materials/applications; Stress grading--timber; Tensile properties/testing--wood products; Clear wood evaluation/testing; Glued laminated timber (glulam); Horizontal shear; Knots; Laminates (wood); Stress cracking tests; Structural building materials/applications (wood); Timber; Visual grading (of lumber); Wood products (structural)

Citing ASTM Standards

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