1、Designation:D291517(Reapproved 2022)Standard Practice forSampling and Data-Analysis for Structural Wood and Wood-Based Products1This standard is issued under the fixed designation D2915;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision
2、,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONSampling and data analysis should be integrated in the design and evaluation of wood andwood-based structural
3、 products.This practice is useful in assessing the appropriateness of the assignedproperties and for checking the effectiveness of grading procedures.Statistical methodologies areprovided to serve as a basis for the empirical establishment and evaluation of mean and near minimumproperty estimates.Th
4、ese population estimates are then used by product standards to assign structuraldesign values for use with an established design methodology(that is,allowable stress design,loadand resistance factor design,limit states design,etc.).Near-minimum property estimates are typicallyused by the product sta
5、ndards to define the performance for a variety of structural properties wherestrength is a primary consideration(that is,extreme fiber stress in bending,axial tension,axialcompression,shear,and elasticity for buckling concerns).Population mean estimates are often usedto assess serviceability design
6、criteria where strength is not the primary design concern(that is,elasticity estimates used for deformation calculations,permissible compression stress at adeformation,etc.).For situations where a manufactured product is sampled repeatedly or lot sizes are small,alternativetest methods as described
7、in Ref(1)2may be more applicable.1.Scope1.1 This practice covers sampling and analysis proceduresfor the investigation of specified populations of wood andwood-based structural products referred to in this standard asproducts.Appropriate product standards should be referencedfor presentation require
8、ments for data.Depending on theinterest of the user,the population from which samples aretaken may range from the products produced at a specificmanufacturing site to all the products produced in a particulargrade from a particular geographic area,during some specifiedinterval of time.This practice
9、generally assumes that thepopulation is sufficiently large so that,for sampling purposes,it may be considered infinite.Where this assumption isinadequate,that is,the population is assumed finite,many ofthe provisions of this practice may be employed but thesampling and analysis procedure must be des
10、igned to reflect afinite population.The statistical techniques embodied in thispractice provide procedures to summarize data so that logicaljudgments can be made.This practice does not specify theaction to be taken after the results have been analyzed.Theaction to be taken depends on the particular
11、requirements of theuser of the product.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This practice does not purport to address t
12、he adjustmentfactors needed to adjust test data to standardized mechanicaland environmental conditions(that is,temperature,moisture,test span,or load duration).Additionally,it provides a basis forstatistical estimates that will typically require further adjust-ment to determine design values for use
13、 with an accepteddesign methodology(that is,allowable stress,limit states,or1This practice is under the jurisdiction of ASTM Committee D07 on Wood andis the direct responsibility of Subcommittee D07.02 on Lumber and EngineeredWood Products.Current edition approved Feb.1,2022.Published March 2022.Ori
14、ginallyapproved in 1970 as D2915 70 T.Last previous edition approved in 2017 asD2915 17.DOI:10.1520/D2915-17R22.2The boldface numbers in parentheses refer to the list of references at the end ofthis practice.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-29
15、59.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Ba
16、rriers to Trade(TBT)Committee.1load and resistance factor design).It shall be the responsibilityof the user to seek out the appropriate adjustments in specificproduct standards.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international stan