1.1 本规程包含根据全尺寸试验结果确定用于打桩的圆木平行于纹理的容许压缩应力和弯曲应力的程序。 注1: 垂直于晶粒的压缩许用应力和剪切性能根据实践规定确定 D2899 . 1.2 根据本规程确定的应力适用于符合规范中尺寸、质量、平直度、螺旋纹、结、震动和劈裂规定的桩 D25 . 1.3 ASTM国际组织提供了该实践的评论。 1.4 以英寸-磅为单位的数值应视为标准值。本标准不包括其他计量单位。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户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====== 4.1 本规程主要供协会、第三方评级机构、技术协会和其他团体使用，这些团体制定了国家设计标准，并使用了圆木桩的建议。 4.2 本规程提供了确定圆木桩平行于纹理的压缩应力和弯曲应力的程序，包括:测试材料的取样；试验方法和性能计算程序；测试数据的分布分析；确定关键截面位置调整的程序；桩过大、荷载分担和处理；以及推导容许应力的程序。 4.3 在使用根据本规程确定的容许应力时，设计师应考虑可能影响桩系统性能的每个终端使用的特定因素。这些因素包括临界截面的位置、土壤的承载力、桩承受驱动力的能力、将桩连接在一起的桩帽或荷载分布元件的特性以及荷载和使用条件。

1.1 This practice contains procedures for establishing allowable compression parallel to grain and bending stresses for round timbers used for piling, based on results from full-size tests. Note 1: Allowable stresses for compression perpendicular to grain and shear properties are established in accordance with the provisions of Practice D2899 . 1.2 Stresses established under this practice are applicable to piles conforming to the size, quality, straightness, spiral grain, knot, shake and split provisions of Specification D25 . 1.3 A commentary on the practice is available from ASTM International. 1.4 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this 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 ====== 4.1 This practice is primarily intended for use by associations, third-party grading agencies, technical societies and other groups that develop national design standards and use recommendations for round timber piles. 4.2 This practice provides procedures for establishing compression parallel to grain and bending stresses for round timber piles including: sampling of material for testing; methods of test and property calculation procedures; distribution analysis of test data; procedures for determining adjustments for critical section location; pile oversize, load sharing and treatment; and procedures for deriving allowable stresses. 4.3 In using allowable stresses established under this practice, factors specific to each end use which may affect the performance of the pile system shall be considered by the designer. Such factors include the location of the critical section, the bearing capacity of the soil, the ability of the pile to withstand driving forces, the properties of the cap or load distributive element tying piles together and the loading and conditions of service.