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ASTM-D6815:2002 Edition

ASTM-D6815:2002 Edition

$44.96

D6815-02a Standard Specification for Evaluation of Duration of Load and Creep Effects of Wood and Wood-Based Products

Published By Publication Date Number of Pages
ASTM 2002 11
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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 structural-use 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 D 245 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 D 245 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 standard (see Commentary X1.2.4).

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
Terminology
2 Significance and Use
Test Methods and Acceptance Criteria
3 Report
4 Precision and Bias
Keywords
X1. COMMENTARY ON DURATION OF LOAD EFFECTS IN WOOD PRODUCTS
X1.1 Scope
X1.2 Background
5 X1.3 Duration of Load Results for Solid Sawn Structural Size Lumber
FIG. X1.1
6 X1.4 Duration of Load Evaluation Procedure
FIG. X1.2
FIG. X1.3
7 FIG. X1.4
TABLE X1.1
8 X1.5 Example Evaluations
X2. COMMENTARY ON CREEP EFFECTS IN WOOD PRODUCTS
X2.1 Scope
X2.2 Background
X2.3 Creep Results for Solid Sawn, Structural Composite Lumber and Structural Panels
9 X2.4 Example Fractional Deflection and Creep Rate Determination
TABLE X2.1
TABLE X2.2
10 REFERENCES
FIG. X2.1
FIG. X2.2

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