This standard gives statistical methods for the determination of characteristic values from test results on a sample drawn from a clearly defined reference population of e.g. solid wood, fasteners, connectors and wood-based products. The characteristic value is an estimate of the property of the reference population and can be based on a 5-percentile value of strength, resistance or density as well as on a mean value for stiffness. Parametric methods are given for the determination of lower and upper 5-percentiles. The upper 5-percentile is the 95-percentile. This standard is suitable for use with any structural product in the frame of type testing as well as factory production control. Sampling is not covered by this document, but reference is made to the relevant product standards. This standard also provides the acceptance procedure for verification of a lot. Depending on the product, characteristic values determined in accordance with this standard may be used directly or may need additional adjustments specified in the relevant product standards. Note: For example, in the case of solid timber, specific adjustment factors for calculation of characteristic values are given in EN 384.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 25<\/td>\n | Contents Page <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | European foreword <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 1 Scope 2 Symbols <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 3 Calculation of characteristic properties from test results in the frame of initial type testing 3.1 General 3.2 Calculation of 5 and 95 percentiles values 3.2.1 General 3.2.2 Parametric calculation <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Table 1 \u2014 values for strength properties for p = 5 % and \u03b1 = 75 % <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 3.2.3 Non parametric calculation 3.3 Calculation of characteristic mean values <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Table 2 \u2014 values for stiffness properties 4 Calculation of characteristic properties from test results in the frame of internal factory production control 4.1 General 4.2 Calculation of characteristic strength, density or resistance properties (5-percentile) <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Table 3 \u2014 values for strength properties 4.3 Calculation of characteristic stiffness properties (mean values) <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Table 4 \u2014 values for stiffness properties 5 Acceptance procedure for verification of a lot 5.1 General 5.2 Verification of mean values (e.g. mean modulus of elasticity) 5.2.1 Method keeping the consumer\u2019s risk at 10 % <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Table 5 \u2014 Sample size for verification of mean values 5.2.2 Alternative method limiting the sample size for large COVs 5.3 Verification of 5-percentile values (e.g. characteristic strength) 5.3.1 Method with consumer’s risk equal to 10 % Table 6 \u2014 Sample size for verification of 5-percentile values Table 7 \u2014 plim values for verification of 5-percentile values <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | 5.3.2 Alternative method limiting the sample size for large COVs Table 8 \u2014 plim values for high COVs <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Tracked Changes. Timber structures. Calculation and verification of characteristic values<\/b><\/p>\n |