1.1 这些试验方法涵盖主要用于支撑吸声瓦、吸声铺设板或悬挂式T型杆天花板系统的金属天花板悬挂系统。 1.2 这些试验方法包括测定吊顶格栅系统组件的强度特性，如下所示: 测验 子章节 承载能力 5.1 受拉连接强度 5.2.2 ; 5.2.4 压缩连接强度 5.2.3 ; 5.2.5 导线拔出电阻 5.3 1.3 以国际单位制或英寸表示的数值- 磅单位应单独视为标准单位。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.4 以下安全隐患警告仅适用于本规范中描述的测试方法。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。 1.5 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 承载能力: 4.1.1 大多数建筑规范都包含基于规范的均匀荷载要求 C635 . 此外，了解横向滑道的均匀荷载有助于评估其对各种天花板荷载的适用性。 4.1.2 本标准中详述的程序旨在用于规范中规定的简单4 ft跨度 C635 但它可以用于4英尺以外的简单跨度。 4.1.3 可以对各种集中荷载组合进行类似测试，也可以通过工程分析从均匀荷载结果中计算。 4.2 拉伸和压缩连接强度: 4.2.1 轴向荷载下网架系统的结构失效由网架构件之间的连接失效控制。允许轴向载荷的规范对于设计者和说明者确定哪些电网系统适用于特定工作条件非常有用。 4.2.2 当电网安装预计将承受地震或风引起的横向荷载时，连接强度尤为重要。 4.2.3 实践中规定了压缩和拉伸的连接强度 E580 作为拉伸和压缩的平均极限试验载荷。

1.1 These test methods cover metal ceiling suspension systems used primarily to support acoustical tile, acoustical lay-in panels, or suspended T-bar type ceiling systems. 1.2 These test methods cover the determination of strength properties of suspended ceiling grid system components as follows: Tests Subsections Load Carrying Capacity 5.1 Connection Strength in Tension 5.2.2 ; 5.2.4 Connection Strength in Compression 5.2.3 ; 5.2.5 Wire Pullout Resistance 5.3 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.4 The following safety hazards caveat pertains only to the test methods described in this specification. 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. 1.5 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 Load Carrying Capacity: 4.1.1 Most architectural specifications contain a uniform load requirement based on Specification C635 . Additionally, it is useful to know the uniform loads of cross runners to evaluate their suitability for various ceiling loads. 4.1.2 The procedure detailed in this standard is intended to be used for the simple 4 ft span specified in Specification C635 but it can be used for simple spans other than 4 ft. 4.1.3 Various concentrated load combinations can be similarly tested or they can be calculated from the uniform load results by engineering analysis. 4.2 Connection Strength in Tension and Compression: 4.2.1 Structural failure of grid systems under axial loading is controlled by the failure of connections between the grid members. Specification of the allowable axial loads is useful for designers and specifiers for determining which grid systems will be appropriate for specific job conditions. 4.2.2 Connection strength is particularly important where the grid installation is expected to experience lateral loads due to earthquake or wind. 4.2.3 Connection strength in both compression and in tension are specified in Practice E580 as mean ultimate test load in tension and in compression.