1.1 这些试验方法包括通过各种试验程序对结构尺寸的木材和木质产品进行评估。 1.2 测试方法按以下顺序出现: 小节 弯曲度 4 – 11 压缩（短试样） 13 – 20 压缩（长试样） 21 – 28 紧张 29 – 36 扭转 37 – 44 剪切模量 45 – 52 1.3 与各种测试程序相关的符号和符号见 附录X1 . 1.4 以英寸-磅单位表示的数值视为标准值。括号中给出的值是数学转换为SI单位，仅供参考，不被视为标准单位。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 6.1 通过本试验方法确定的弯曲性能提供: 6.1.1 用于制定分级规则和规范的数据； 6.1.2 用于制定结构构件设计值的数据； 6.1.3 缺陷对结构构件力学性能影响的数据； 6.1.4 不同种类或等级、不同结构尺寸的强度特性数据； 6.1.5 用于检查与结构性能相关的现有方程或假设的数据； 6.1.6 化学或环境条件对机械性能影响的数据； 6.1.7 制造变量的影响数据，如深度、锥度、缺口或叠片中端接头的类型；和 6.1.8 机械性能和物理性能之间关系的数据。 6.2 这里对程序进行了充分详细的描述，以允许在不同的实验室进行复制，从而有效地比较不同来源的结果。如果特殊情况需要偏离这些程序的某些细节，则应在报告中仔细描述这些偏离（见第 11 ).

1.1 These test methods cover the evaluation of lumber and wood-based products in structural sizes by various testing procedures. 1.2 The test methods appear in the following order: Sections Flexure 4 – 11 Compression (Short Specimen) 13 – 20 Compression (Long Specimen) 21 – 28 Tension 29 – 36 Torsion 37 – 44 Shear Modulus 45 – 52 1.3 Notations and symbols relating to the various testing procedures are given in Appendix X1 . 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 6.1 The flexural properties established by this test method provide: 6.1.1 Data for use in development of grading rules and specifications; 6.1.2 Data for use in development of design values for structural members; 6.1.3 Data on the influence of imperfections on mechanical properties of structural members; 6.1.4 Data on strength properties of different species or grades in various structural sizes; 6.1.5 Data for use in checking existing equations or hypotheses relating to the structural behavior; 6.1.6 Data on the effects of chemical or environmental conditions on mechanical properties; 6.1.7 Data on effects of fabrication variables such as depth, taper, notches, or type of end joint in laminations; and 6.1.8 Data on relationships between mechanical and physical properties. 6.2 Procedures are described here in sufficient detail to permit duplication in different laboratories so that comparisons of results from different sources will be valid. Where special circumstances require deviation from some details of these procedures, these deviations shall be carefully described in the report (see Section 11 ).