1.1 本试验方法包括在平行板荷载下测定塑料管的荷载-挠度特性。 1.2 本试验方法涵盖热塑性树脂管、增强热固性树脂管（RTRP）和增强聚合物砂浆管（RPMP）。 1.3 该试验方法确定的特性为管道刚度、刚度系数和特定挠度下的载荷。 1.4 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 注1: 虽然本试验方法可用于测量波纹塑料管或管材、其他型材壁设计以及聚乙烯、PVC或聚丙烯制品的管道刚度，但使用了特殊条件和程序。 这些细节包括在产品标准中，例如规范 F667/F667M , F949 , F2764/F2764M ，以及其他。 1.5 本试验方法的文本参考了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为试验方法的要求。 1.6 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。 1.7 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====== 5.1 通过本试验方法获得的塑料管的外部荷载特性用于以下方面: 5.1.1 确定管道的刚度。这是管道尺寸和管道材料物理特性的函数。 5.1.2 确定用于工程设计的荷载-挠度特性和管道刚度（参见 附录X1 ). 5.1.3 比较各种管形塑料的特性。 5.1.4 研究塑料管和导管的尺寸和挠度特性的相互关系。 5.1.5 在测试过程中发生的几个重要事件中的任何一个事件中测量挠度和负载电阻。

1.1 This test method covers the determination of load-deflection characteristics of plastic pipe under parallel-plate loading. 1.2 This test method covers thermoplastic resin pipe, reinforced thermosetting resin pipe (RTRP), and reinforced polymer mortar pipe (RPMP). 1.3 The characteristics determined by this test method are pipe stiffness, stiffness factor, and load at specific deflections. 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. Note 1: While this test method can be used in measuring the pipe stiffness of corrugated plastic pipe or tubing, other profile wall designs, and products produced from polyethylene, PVC or polypropylene, special conditions and procedures are used. These details are included in the product standards, for example, Specifications F667/F667M , F949 , F2764/F2764M , and others. 1.5 The text of this test method references 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 test method. 1.6 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. 1.7 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 ====== 5.1 The external loading properties of plastic pipe obtained by this test method are used for the following: 5.1.1 To determine the stiffness of the pipe. This is a function of the pipe dimensions and the physical properties of the material of which the pipe is made. 5.1.2 To determine the load-deflection characteristics and pipe stiffness which are used for engineering design (see Appendix X1 ). 5.1.3 To compare the characteristics of various plastics in pipe form. 5.1.4 To study the interrelations of dimensions and deflection properties of plastic pipe and conduit. 5.1.5 To measure the deflection and load-resistance at any of several significant events if they occur during the test.