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UNGÜLTIG ASTM D1990-14 15.2.2014 Ansicht

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ASTM D1990-14

Standard Practice for Establishing Allowable Properties for Visually-Graded Dimension Lumber from In-Grade Tests of Full-Size Specimens

Automatische name übersetzung:

Standard Praxis zur Etablierung Zulässige Immobilien Optisch-Graded Dimension Lumber von In-Grade Tests größeres Proben

NORM herausgegeben am 15.2.2014

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Bezeichnung normen: ASTM D1990-14
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 15.2.2014
SKU: NS-18950
Zahl der Seiten: 33
Gewicht ca.: 99 g (0.22 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM

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Wood, sawlogs and sawn timber

Die Annotation des Normtextes ASTM D1990-14 :

Keywords:
ICS Number Code 79.040 (Wood, sawlogs and sawn timber)

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Significance and Use

4.1 The procedures described in this practice are intended to be used to establish allowable stress and modulus of elasticity values for solid sawn, visually graded dimension lumber from In-Grade type test data. These procedures apply to the tested and untested sizes and grades when an adequate data matrix of sizes and grades exists. In addition, the methodology for establishing allowable stress and modulus of elasticity values for combinations of species and species groups is covered. Allowable stress and modulus of elasticity values may also be developed for a single size or a single grade of lumber from test data.

4.2 Methods for establishing allowable stress and modulus of elasticity values for a single size/grade test cell are covered in Practice D2915. The appropriateness of these methods to establish allowable stress and modulus of elasticity values is directly dependent upon the quality and representativeness of the input test data.

4.3 A monitoring program shall be established to periodically review the continued applicability of allowable properties derived by this practice. A monitoring program will establish data sets that are either the same as, above, or below the data that was used to develop the current allowable properties. Upon detection of a statistically significant downward shift, evaluation of the data and confirmation of remedial actions shall be undertaken. When evaluation is not undertaken or the results of the evaluation indicate an adjustment to allowable properties is appropriate, a reassessment shall be conducted to re-establish allowable properties.

1.1 This practice covers the principles and procedures for establishing allowable stress values for bending, tension parallel to grain, compression parallel to grain and modulus of elasticity values for structural design from “In-Grade” tests of full-size visually graded solid sawn dimension lumber. This practice also covers procedures for periodic monitoring, and additional procedures, if needed, for evaluation and possible reassessment of assigned design values. This practice is focused on, but is not limited to, grades which used the concepts incorporated in Practice D245 and were developed and interpreted under American Softwood Lumber PS 20.

1.2 A basic assumption of the procedures used in this practice is that the samples selected and tested are representative of the entire global population being evaluated. This approach is consistent with the historical clear wood methodology of assigning an allowable property to visually-graded lumber which was representative of the entire growth range of a species or species group. Every effort shall be made to ensure the test sample is representative of population by grade and size (see 1.3 Due to the number of specimens involved and the number of mechanical properties to be evaluated, a methodology for evaluating the data and assigning allowable properties to both tested and untested grade/size cells is necessary. Sampling and analysis of tested cells are covered in Practice D2915. The mechanical test methods are covered in Test Methods D198 and D4761. This practice covers the necessary procedures for assigning allowable stress and modulus of elasticity values to dimension lumber from In-Grade tests. The practice includes methods to permit assignment of allowable stress and modulus of elasticity values to untested sizes and grades, as well as some untested properties. The practice includes procedures for periodic monitoring of the species or species group to quantify potential changes in the product and verification of the assigned design values through, evaluation, and reassessment.

1.4 This practice only covers dimension lumber.

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

D2915-17(2022)	Standard Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products
D4442-20	Standard Test Methods for Direct Moisture Content Measurement of Wood and Wood-Based Materials
National Institute of Standards and Technology Voluntary Product Standard PS 20-94 Available from U.S. Government Printing Office Superintendent of Documents, 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://www.access.gpo.gov.
D2555-17a(2024)e1	Standard Practice for Establishing Clear Wood Strength Values (Includes all amendments and changes 2/23/2024).
IEEE/ASTM?SI?10	Standard for Use of the International System of Units (SI): The Modern Metric System
D9-20	Standard Terminology Relating to Wood and Wood-Based Products
D4444-13(2018)	Standard Test Method for Laboratory Standardization and Calibration of Hand-Held Moisture Meters
D1165-23	Standard Nomenclature of Commercial Hardwoods and Softwoods
D245-22	Standard Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber
D198-22a	Standard Test Methods of Static Tests of Lumber in Structural Sizes (Includes all amendments and changes 10/14/2022).
E380-93	Standard Practice for Use of the Internation System of Units (SI) (the Modernized Metric System) (Withdrawn 1997)
D4761-19	Standard Test Methods for Mechanical Properties of Lumber and Wood-Based Structural Materials

ASTM D1990-14

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