ASTM D6815-22a
Standard Specification for Evaluation of Duration of Load and Creep Effects of Wood and Wood-Based Products

Standard No.

ASTM D6815-22a

Release Date

2022

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D6815-22a

Scope

1.1 This specification provides a procedure for testing and evaluating duration of load and creep effects of wood and wood-based materials relative to an accepted duration of load adjustment model. This specification was created for products that are currently covered by a consensus standard (for example, lumber, structural composite lumber, and structuraluse panels). This procedure is intended to demonstrate the engineering equivalence to the duration of load and creep effects of visually graded lumber as specified in Practice D245 for a product under evaluation used in dry service conditions. This procedure is not intended to evaluate the performance of products under impact loading. Quantification of specific duration of load or creep factors is beyond the scope of this specification. For further guidance regarding the applicability of this specification refer to X1.1 in the Commentary. 1.2 Use of the procedure in this specification to determine equivalence to the Practice D245 duration of load relationship is limited to solid wood and wood-based products whose long term load behavior is similar to that of solid wood. Equivalence demonstrated in this specification is dependent upon evaluation of a product’s 90-day (minimum) creep-rupture performance. In this evaluation, three criteria must be satisfied: (1) adequate strength over a 90-day period, (2) decreasing creep rate, and (3) limited fractional deflection. A summary of the development of these criteria and the underlying assumptions behind them is provided in the Commentary in Appendix X1 and Appendix X2. 1.3 Long term degradation phenomena not described by a creep-rupture model are not addressed in this specification (see Commentary X1.2.4). 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. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM D6815-22a Referenced Document

• ASTM D1037 Standard Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel Materials
• ASTM D198 Standard Test Methods of Static Tests of Lumber in Structural Sizes
• ASTM D245 Standard Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber
• ASTM D2915 Standard Practice for Evaluating Allowable Properties for Grades of Structural Lumber
• ASTM D3043 Standard Methods of Testing Structural Panels in Flexure
• ASTM D4442 Standard Test Methods for Direct Moisture Content Measurement of Wood and Wood-Base Materials
• ASTM D4761 Standard Test Methods for Mechanical Properties of Lumber and Wood-Based Structural Materials
• ASTM D9 Standard Terminology Relating to Wood
• ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• ASTM E4 Standard Practices for Force Verification of Testing Machines
• ASTM E6 Standard Terminology Relating to Methods of Mechanical Testing

ASTM D6815-22a history

• 2022 ASTM D6815-22a Standard Specification for Evaluation of Duration of Load and Creep Effects of Wood and Wood-Based Products
• 2022 ASTM D6815-22 Standard Specification for Evaluation of Duration of Load and Creep Effects of Wood and Wood-Based Products
• 2009 ASTM D6815-09(2015) Standard Specification for Evaluation of Duration of Load and Creep Effects of Wood and Wood-Based Products
• 2009 ASTM D6815-09 Standard Specification for Evaluation of Duration of Load and Creep Effects of Wood and Wood-Based Products
• 2002 ASTM D6815-02a Standard Specification for Evaluation of Duration of Load and Creep Effects of Wood and Wood-Based Products
• 2002 ASTM D6815-02 Standard Specification for Evaluation of Duration of Load and Creep Effects of Wood and Wood-Based Products