ASTM D1109-84(2013)..
ASTM D1110-84(2013)..
ASTM D1166-84(2013)..
ASTM D143-14
ASTM D1666-11
ASTM D198-14
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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
Automaticky preložený názov:
Štandardné postupy pre zriadenie Dovolené Vlastnosti zrakovo-triedené dimenzie drevo z in-Grade Skúšky Full-Size vzoriek
NORMA vydaná dňa 15.2.2014
Informácie o norme:
Označenie normy: ASTM D1990-14
Poznámka: NEPLATNÁ
Dátum vydania normy: 15.2.2014
Kód tovaru: NS-18950
Počet strán: 33
Približná hmotnosť: 99 g (0.22 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D1990-14 :
Keywords:
ICS Number Code 79.040 (Wood, sawlogs and sawn timber)
Doplňujúce informácie
| Significance and Use | ||||||||||||||||||||||||
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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. |
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| 2. Referenced Documents | ||||||||||||||||||||||||
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Podobné normy:
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