ASTM D6570-2018 red 2500 Standard Practice for Assigning Allowable Properties for Mechanically Graded Lumber.pdf
《ASTM D6570-2018 red 2500 Standard Practice for Assigning Allowable Properties for Mechanically Graded Lumber.pdf》由会员分享,可在线阅读,更多相关《ASTM D6570-2018 red 2500 Standard Practice for Assigning Allowable Properties for Mechanically Graded Lumber.pdf(11页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D6570 04 (Reapproved 2010)D6570 18Standard Practice forAssigning Allowable Properties for Mechanically GradedLumber1This standard is issued under the fixed designation D6570; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revis
2、ion, 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.1. Scope1.1 This practice covers the methodology of grade qualification, assignment of design properties, and req
3、uirements for thequality control of mechanically graded solid sawn lumber.1.2 This practice acknowledges alternative methods for the assignment of specific properties. These methods are assignment bytest, relationship to other properties, and by procedures in other appropriate standards.1.3 This int
4、ernational standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Co
5、mmittee.2. Referenced Documents2.1 ASTM Standards:2D9 Terminology Relating to Wood and Wood-Based ProductsD143 Test Methods for Small Clear Specimens of TimberD198 Test Methods of Static Tests of Lumber in Structural SizesD245 Practice for Establishing Structural Grades and Related Allowable Propert
6、ies for Visually Graded LumberD1165 Nomenclature of Commercial Hardwoods and SoftwoodsD1990 Practice for EstablishingAllowable Properties for Visually-Graded Dimension Lumber from In-Grade Tests of Full-SizeSpecimensD2395 Test Methods for Density and Specific Gravity (Relative Density) of Wood and W
7、ood-Based MaterialsD2555 Practice for Establishing Clear Wood Strength ValuesD2915 Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based ProductsD3737 Practice for Establishing Allowable Properties for Structural Glued Laminated Timber (Glulam)D4442 Test Methods for Direct Moist
8、ure Content Measurement of Wood and Wood-Based MaterialsD4444 Test Method for Laboratory Standardization and Calibration of Hand-Held Moisture MetersD4761 Test Methods for Mechanical Properties of Lumber and Wood-Base Structural MaterialD7438 Practice for Field Calibration and Application of Hand-He
9、ld Moisture Meters2.2 ANSI Standards:3ANSI/AITC A190.1 American National Standard for Wood ProductsStructural Glued Laminated TimberANSI/AF and shall not be owned, operated, or controlled by any such company.3.2.3.2 DiscussionThe agency shall conform with the provisions for agency accreditation unde
10、r the appropriate consensus standard.3.2.4 visual evaluation, nidentification and appraisal of lumber growth and manufacturing characteristics by visual means aspart of the lumber segregation process.NOTE 1In the United States and Canada, criteria for agency accreditation are contained in PS 20, ANS
11、I/AITC A190.1, and CSA O141.4. Significance and Use4.1 The procedures described in this practice are intended to be used to establish appropriate allowable unit stresses, moduli ofelasticity, and specific gravity for mechanically graded solid sawn lumber. An on-going quality control program to monit
12、orcompliance with the assigned grade properties is required.5. System Requirements5.1 Mechanical Device Requirements A mechanical device used as part of the grading process shall demonstrate the abilityto measure the mechanical or physical wood property used to segregate the lumber.5.2 Visual Requir
13、ements:5.2.1 Characteristics to be limited by visual evaluation, shall be documented as part of the qualification and quality controlprocedures. Such limitations shall be part of the grade requirements.5.2.2 Personnel conducting visual evaluations shall be qualified by the agency.6. Criteria for Gra
14、de Qualification6.1 General Requirements:6.1.1 A minimum of one assigned property of a grade shall be qualified by test. The grade assignment for properties qualifiedby test is given in 7.2.6.1.1.1 If the modulus of elasticity (MOE) is the only property assigned to a grade, it shall be evaluated by
15、test.6.1.1.2 If both strength and MOE properties are assigned to a grade, a minimum of one strength property and one MOE propertyshall be evaluated by test. If only one strength property is tested, that property shall be either the modulus of rupture (MOR) orultimate tensile stress (UTS).6.1.2 Each
16、grade shall be qualified at each size and for each species/species group.6.1.3 Sampling, evaluation, and presentation of data shall be in accordance with Practice D2915.6.2 Qualification Samples:6.2.1 The criteria for selecting qualification samples shall be documented and shall be in accordance wit
17、h 6.1.3.6.2.2 All qualification samples shall meet the visual requirements established for the grade.6.2.3 The minimum sample size for estimation of strength properties, and MOE shall be 53 specimens.6.2.4 The minimum sample size for estimation of mean or median property values, other than MOE, shal
18、l be 30 specimens.6.2.5 When the allowable shear stress parallel to grain (Fv) or the allowable compressive stress perpendicular to grain (Fc)are determined in accordance with 7.3.4 and 7.3.5, respectively, the specific gravity of a minimum of 30 qualification testspecimens shall be measured and rec
19、orded.6.3 Qualification Test Methods:D6570 1826.3.1 When mechanical and physical properties in Section 7 are determined by tests, the appropriate ASTM standards shall beused.6.3.1 Mechanical test methods shall be in accordance withWhen mechanical and physical properties in Section 7 TestMethodsare d
20、etermined D143,by D198, ortests, the D4761.appropriate ASTM standards shall be used:6.3.1.1 The determination of the MOE by edgewise bending shall employ third-point in accordance with Test Methods D4761.6.3.1.2 The determination of the MOE and MOR by edge-wiseedgewise bending shall employ third-poi
21、nt in accordance withTest Methods D4761.6.3.1.3 The determination of the MOE by flat-wise bending shall be in accordance with Test Methods D4761.6.3.1.4 The UTS of a sample shall be determined according to Test Methods D4761.6.3.1.5 The UTS of a sample shall be determined according to Test Methods D
22、4761. Whenever possible, a minimum gagelength of not less than 96 in. (2.44 m) shall be used. When determination of the tension parallel to the grain MOE is desired, testingshall be conducted according to the provisions of Test Methods D198.6.3.1.6 The determination of the ultimate shear strength pa
23、rallel to grain values shall be in accordance with Test Methods D143.6.3.1.7 The determination of the compression perpendicular to grain values shall be in accordance with Test Methods D143.6.3.2 Determination of the moisture content of the lumber sample shall be in accordance with Test Methods D444
24、2 or D7438.6.3.3 Specific gravity shall be based on weight and dimensions when oven dry as specified in Test Methods D2395.Measurements shall either be taken on oven-dried specimens, or at some other moisture content and the values adjusted to theoven-dry condition.6.3.4 Determination of the moistur
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
5000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD65702018RED2500STANDARDPRACTICEFORASSIGNINGALLOWABLEPROPERTIESFORMECHANICALLYGRADEDLUMBERPDF

链接地址:http://www.mydoc123.com/p-522897.html