ASTM D2915-17(2022)

Standard Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products

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NORMA vydána dne 1.2.2022


Jazyk
Provedení
DostupnostSKLADEM
Cena1 510.90 bez DPH
1 510.90

Informace o normě:

Označení normy: ASTM D2915-17(2022)
Datum vydání normy: 1.2.2022
Kód zboží: NS-1050997
Počet stran: 14
Přibližná hmotnost: 42 g (0.09 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM

Kategorie - podobné normy:

Dřevo. Kulatina na řezivo. Řezivo

Anotace textu normy ASTM D2915-17(2022) :

This practice covers sampling and analysis procedures for the investigation and evaluation of allowable properties of specified populations of stress-graded structural lumber. This practice generally assumes that the population is sufficiently large so that, for sampling purposes, it may be considered infinite. The population shall be clearly defined where it may be necessary to specify the following: (1) grade name and description, (2) geographical area over which sampling will take place, (3) species or species group, (4) time span for sampling (5) lumber size, and (6) moisture content. Two statistical techniques are described under this practice, namely: parametric and nonparametric analysis. The sampling methods include: (1) random sampling, (2) sampling with unequal probabilities, and (3) sequential sampling. Selection and method of determining sample size are detailed. The results of the tests performed shall be presented as (1) a set of summarizing statistics, and (2) an appendix of unadjusted individual test specimen results. The procedures and requirements for analysis of results are detailed and includes the following: (1) adjustment factors used to reduce the test statistics to the level of allowable properties, (2) formula for calculating apparent modulus of elasticity, sample mean, sample standard deviation, and confidence interval for the mean (3) sample nonparametric percent point estimate, (4) nonparametric lower tolerance limit, (5) parametric point estimate, (6) lower parametric tolerance limit, and (7) histogram and empirical cumulative distribution function. This practice does not specify the action to be taken after the results have been analyzed.


Keywords:
confidence level, mean and median properties, parametric and nonparametric properties, sample size, standard error,, ICS Number Code 79.040 (Wood, sawlogs and sawn timber)

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