1.1 本试验方法包括通过沿一条对角线对砌体组合进行压缩加载来确定砌体组合的对角线抗拉强度或抗剪强度（参见 图1 )从而导致对角拉伸失效，试样平行于载荷方向裂开。 图1 测定对角抗拉强度或抗剪强度砌体组件的仪器 1.2 附件A1 提供了有关在组合对角拉伸和压缩荷载下确定砌体对角拉伸强度的要求。 1.3 本标准文本指提供说明材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本标准的要求。 1.4 这些试验方法涵盖了使用任一英寸- 磅或国际单位制。以国际单位制或英寸磅单位表示的数值应单独视为标准值。在文本中，英寸磅单位显示在括号中。每个系统中规定的值可能不完全相等；因此，每个系统应独立使用。将两个系统的值合并可能导致不符合标准。 1.5 本标准可能涉及危险材料、操作和设备。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建立适当的安全、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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 3.1 与其他可用方法相比，本试验方法旨在更准确地测量砌体的对角拉伸（剪切）强度。样本尺寸被选择为最小的，能够合理代表全尺寸砌体组合，并允许使用许多实验室使用的测试机器。 注1: 作为一种研究试验方法，仅用于评估砌块类型、砂浆、工艺等变量的影响。 如果可用的测试设备不能容纳1.2m[4-ft]平方的试样，则可以使用较小尺寸的试样。然而，缺乏能够评估试样尺寸对抗剪强度影响的实验数据，或者能够在小规模试样试验结果与较大试样之间进行相关性的实验数据。

1.1 This test method covers determination of the diagonal tensile or shear strength of masonry assemblages by loading them in compression along one diagonal (see Fig. 1 ), thus causing a diagonal tension failure with the specimen splitting apart parallel to the direction of load. FIG. 1 Apparatus for Determination of Diagonal Tensile or Shear Strength Masonry Assemblages 1.2 Annex A1 provides requirements regarding the determination of the diagonal-tension strength of masonry under combined diagonal-tension and compressive loading. 1.3 The text of this standard refers to notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.4 These test methods cover the application of the tests using either inch-pound or SI units. The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.5 This standard may involve hazardous materials, operations, and equipment. 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 ====== 3.1 This test method was developed to measure more accurately the diagonal tensile (shear) strength of masonry than was possible with other available methods. The specimen size was selected as being the smallest that would be reasonably representative of a full-size masonry assemblage and that would permit the use of testing machines such as are used by many laboratories. Note 1: As a research test method used only for the purpose of evaluating the effects of variables such as type of masonry unit, mortar, workmanship, etc., a smaller size specimen could be used if the available testing equipment will not accommodate a 1.2-m [4-ft] square specimen. However, there is a lack of experimental data that would permit an evaluation of the effect of specimen size on the shear strength or to permit a correlation between the results of small-scale specimen tests and larger specimens.