SANS 745-3-2008 Structural laminated veneer lumber Part 3 Determination of structural properties - Evaluation methods《结构层积单板 第3部分 结构特性测定 评价方法》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22182-9 SANS 745-3:2008Edition 1AS/NZS 4357.3:2006Edition 1SOUTH AFRICAN NATIONAL STANDARD Structural laminated veneer lumber Part 3: Dete

4、rmination of structural properties Evaluation methods This national standard is the identical implementation of AS/NZS 4357.3:2006 and is adopted with the permission of Standards Australia and Standards New Zealand. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 P

5、retoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 745-3:2008 Edition 1 AS/NZS 4357.3:2006 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS SC 1008A, Sawn timber and semi-manufactured ti

6、mber products Structural timber, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in November 2008. AS/NZS 4357.3:2006Australian/New Zealand StandardTMStructural laminated veneer lumber Part 3: Determi

7、nation of structural properties Evaluation methods First published as AS/NZS 4357.3:2006 COPYRIGHT Standards Australia/Standards New Zealand All rights are reserved. No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, withou

8、t the written permission of the publisher Jointly published by Standards Australia, GPO Box 476, Syndey, NSW 2001 and Standards New Zealand, Private Bag 2439, Wellington 6020 ISBN 0 7337 7368 0 AS/NZS 4357.3:2006 2 PREFACE This Standard was prepared by the Joint Standards Australia/Standards New Zea

9、land Committee TM-008, Plywood Timber Products, in conjunction with TM-001, Timber Structures. The Standard is based on EN 1058, Wood-based panels Determination of characteristic values of mechanical properties and density, and prEN 14358, Timber structures Fasteners and wood-based products Calculat

10、ion of characteristics 5 percentile value and acceptance criteria for a sample, and assumes test results that are logarithmically normally distributed. The objective of this Standard is to provide evaluation methods for the determination of structural properties of structural laminated veneer lumber

11、 (LVL), which will replace the methods used in the past specified for sawn timber in AS/NZS 4063, Timber Stress-graded In-grade strength and stiffness evaluation. This Standard is Part 3 of the AS/NZS 4357 series, Structural laminated veneer lumber, which is comprised of the following parts: AS/NZS

12、4357 Structural laminated veneer lumber 4357.0 Part 0: Specifications (Revision of AS/NZS 4357:1995) 4357.1 Part 1: Method of test for measurement of dimensions and shape 4357.2 Part 2: Determination of structural properties Test methods 4357.3 Part 3: Determination of structural properties Evaluati

13、on methods (this Standard) 4357.4 Part 4: Determination of formaldehyde emissions The term informative has been used in this Standard to define the application of the appendix to which it applies. An informative appendix is only for information and guidance. 3 AS/NZS 4357.3:2006 CONTENTS Page 1 SCOP

14、E . 4 2 REFERENCED DOCUMENTS 4 3 DEFINITIONS 4 4 NOTATION . 4 5 CALCULATION OF MEAN, 5TH PERCENTILE VALUE AND COEFFICIENT OF VARIATION FROM TEST RESULTS 4 6 REPORT 5 APPENDIX A ESTIMATION OF MEAN VALUE, 5TH PERCENTILE VALUE, AND COEFICIENT OF VARIATION . STANDARDS AUSTRALIA/STANDARDS NEW ZEALAND Aus

15、tralian/New Zealand Standard Structural laminated veneer lumber Part 3: Determination of structural properties Evaluation methods 1 SCOPE This Standard specifies a method of calculation for determining the mean and 5th percentile values for structural laminated veneer lumber (LVL) from test results

16、generated in accordance with AS/NZS 4357.2. NOTE This Standard does not provide design values. In the case of Australia and New Zealand, the values obtained in this Standard should be processed in accordance with AS/NZS 4063 for characteristic properties and AS 1720.1 or NZS 3603 for design values.

17、2 REFERENCED DOCUMENTS The following documents are referred to in this Standard: AS/NZS 1720 Timber structures 1720.1 Part 1: Design methods 4063 Timber Stress-graded In grade strength and stiffness evaluation 4357 Structural laminated veneer lumber (LVL) 4357.2 Part 2: Determination of structural p

18、roperties Test methods NZS 3603 Timber Structures Standard 3 DEFINITIONS For the purpose of this Standard the definitions in AS/NZS 4063 apply. 4 NOTATION The symbols used in this Standard are as follows: ks= confidence coefficient for estimating 5th percentile values with 75 % confidence (see table

19、 1) m0575 = 5th percentile value estimated with 75 % confidence m1, m2, mn= test values mi= test value in the range from 1 to n m= mean value for the test values m1, m2, mnn = number of test values Sy= logarithmic standard deviation of test data V = coefficient of variation of test data y= logarithm

20、ic mean of test data 5 AS/NZS 4357.3:2006 COPYRIGHT 5 CALCULATION OF MEAN, 5TH PERCENTILE VALUE AND COEFFICIENT OF VARIATION FROM TEST RESULTS The mean value ( )m , 5th percentile value (m0575), and coefficient of variation (V) of the test values m1, m2, , mnshall be calculated from the following eq

21、uation: m2y=exp +2Sy . . . 5(1) ( )y sy05 75=expmkS . . . 5(2) ( )2y=exp 1VS . . . 5(3) where 12=11=niynnm . . . 5(4) and ()2y2=11=1niSnmny . . . 5(5) Values of ks confidence coefficient for estimating m0575 for n test specimens, are given in table 1. Table 1 ksfor 5th pecentile value 75 % confidenc

22、e Number of specimens (n)ks30 35 40 1,87 1,85 1,83 45 50 70 1,82 1,81 1,78 100 200 500 1,76 1,72 1,69 1 000 3 000 1.68 1,66 1,645 NOTE Intermediate value may be obtained using interpolation. NOTE Appendix A gives an example of estimating the mean value ( )m , 5th percentile value (m0575), and coeffi

23、cient of variation (V) of the test values m1, m2, , mn. 6 Report A written report providing details of the population, sampling, testing analytical procedures and calculation shall be prepared. AS/NZS 4357.3:2006 6 COPYRIGHT APPENDIX A ESTIMATION OF MEAN VALUE, 5TH PERCENTILE VALUE, AND COEFFICIENT

24、OF VARIATION (Informative) Table A1 provides an example for estimation of the mean value, value ( )m , 5th percentile value (m0575), and coefficient of variation (V) of the test values m1, m2, , mn. TABLE A1 EXAMPLE Test values* Logarithmic transformation of test values Specimen count mi(MPa) ln mi(

25、 )2i1ynm Calculations and results 1 2 3 4 51,0 51,6 52,0 52,2 3,93 3,94 3,96 3,96 0,025 0.021 0.019 0,018 5 6 7 8 53,4 54,7 55,0 55,2 3,98 4,00 4,01 4,01 0,013 0,008 0,007 0,006 n = 32 9 10 11 12 55,6 55,8 55,9 56,4 4,02 4,02 4,02 4,03 0,005 0,005 0,004 0,003 1ninm=1=130,88i13 14 15 16 57,6 57,7 58,

26、0 59,9 4,05 4,06 4,06 4,09 0,001 0,001 0,001 0,000 1niynmn1=11= = 4,09 17 18 19 20 60,5 60,9 61,1 61,3 4,10 4,11 4,11 4,12 0,000 0,000 0,001 0,001 ()1 ninm y2=1=0,28i()niSnmyn2i=11=1 =0y,94 21 22 23 24 62,9 63,1 63,3 65,5 4,14 4,14 4,15 4,18 0,003 0,003 0,003 0,008 mSy2y=exp2+ 25 26 27 28 65,7 65,8 66,0 66,1 4,19 4,19 4,19 4,19 0,009 0,009 0,010 0,010 ks = 1,86 ( )y mkSsy05 75=exp =50,2MPa 29 30 31 32 66,5 68,2 69,9 71,2 4,20 4,22 4,25 4,27 0,012 0,018 0,025 0,031 ( )VS2y=exp 1=9,38% * The test values in this example have been ranked. The values given are not mandatory requirements. SABS