1.1 本规范涵盖了隔音砖和铺设板的悬挂系统的安装及其对两组建筑的附加要求，这两组建筑是为了抵抗ASCE 7和国际建筑规范中定义的地震运动的影响。这些分组适用于抗震设计类别C和抗震设计类别D、E和F。 1.2 有管辖权的当局应确定这种做法的适用性。 1.3 试验方法 E3090/E3090M ，规格 C635 ，并练习 C636 涵盖悬挂系统、其安装和测试，无需特别考虑地震横向约束需求。它们仍然适用，并在规定本惯例时应遵循。 1.4 天花板小于或等于144英尺 2 [13.4米 2 ]并由与上述结构相连的墙壁包围的，不受本惯例的要求约束。1.5 这种做法并不是为了扼杀新产品或新方法的研发。本惯例无意阻止任何材料的安装或禁止本惯例中未规定的任何设计或施工方法，前提是任何此类替代方案已由具有管辖权的当局可接受的可验证工程数据或全尺寸动态测试证实。 1.6 天花板面积1000英尺 2 [92.9 m 2 ]或以下的，应免除以下的侧向力支撑要求 5.2.8 . 1.7 由石膏板建造的天花板，该石膏板是用螺钉或钉子连接到悬挂构件上，该悬挂构件在从一面墙延伸到另一面墙的一个水平上支撑天花板，应免除本惯例的要求。 1.8 由结构的链条或缆索支撑的自由浮动天花板（不直接连接到任何结构墙的天花板），只要满足以下要求，就不需要满足地震力要求s: 1.8.1 此类项目的设计载荷应等于垂直工作重量的1.4倍。 1.8.2 地震相互作用效应应按照 5.7 . 1.8.3 与结构的连接应允许在水平面内360°的运动范围。 1.9 以英寸-磅或SI单位表示的值应被视为标准值。在正文中，国际单位制单位显示在括号中。每个系统中陈述的值并不完全等同；因此，每个系统应独立使用。合并两个系统的值会导致不符合规范。 1.10 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。1.11 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》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 3.1 这种做法是一套用于吊顶的规定性安装方法，通常用于代替设计单独的横向约束系统。有管辖权的当局应确定本做法对当地规范要求的适用性。 3.2 本规范涵盖了在ASCE 7和国际建筑规范定义的需要抵抗地震运动影响的区域安装吊顶系统和相关部件。3.3 这种做法分为两个主要部分。第一部分涵盖具有轻度至中度地震潜力的地区（抗震设计类别C），而第二部分涉及严重地震潜力的地区（抗震设计类别D、E&F）。 3.4 本规范包括来自多个来源的要求，包括本规范的以前版本、CISCA对直接悬挂隔音砖和铺设天花板的抗震建议、地震带0-2和CISCA对直接悬挂吊顶组件的抗震限制指南、地震带3和4、国际建筑规范和ASCE 7的吊顶要求。目的是将这些来源的需求组合成一个综合文档。

1.1 This practice covers the installation of suspended systems for acoustical tile and lay-in panels and their additional requirements for two groups of buildings that are constructed to resist the effects of earthquake motions as defined by ASCE 7 and the International Building Code. These groupings are for Seismic Design Category C and Seismic Design Categories D, E and F. 1.2 The authority having jurisdiction shall determine the applicability of this practice. 1.3 Test Methods E3090/E3090M , Specification C635 , and Practice C636 cover suspension systems, their installation, and testing without special regard to seismic lateral restraint needs. They remain applicable and shall be followed when this practice is specified. 1.4 Ceilings less than or equal to 144 ft 2 [13.4 m 2 ] and surrounded by walls connected to the structure above are exempt from the requirements of this practice. 1.5 This practice is not intended to stifle research and development of new products or methods. This practice is not intended to prevent the installation of any material or prohibit any design or method of construction not prescribed in this practice, provided that any such alternative has been substantiated by verifiable engineering data or full-scale dynamic testing that is acceptable to the authority having jurisdiction. 1.6 Ceiling areas of 1000 ft 2 [92.9 m 2 ] or less shall be exempt from the lateral force bracing requirements of 5.2.8 . 1.7 Ceilings constructed of gypsum board which is screw or nail attached to suspended members that support a ceiling on one level extending from wall to wall shall be exempt from the requirements of this practice. 1.8 Free floating ceilings (those not attached directly to any structural walls) supported by chains or cables from the structure are not required to satisfy the seismic force requirements provided they meet the following requirements: 1.8.1 The design load for such items shall equal 1.4 times the vertical operating weight. 1.8.2 Seismic interaction effects shall be considered in accordance with 5.7 . 1.8.3 The connection to the structure shall allow a 360° range of motion in the horizontal plane. 1.9 The values stated in either inch-pound or SI units are to be regarded as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems result in nonconformance with the specification. 1.10 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. 1.11 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 practice is a prescriptive set of installation methods to be used for suspended ceilings and is often used in lieu of designing a separate lateral restraint system. The authority having jurisdiction shall determine the applicability of this practice to local code requirements. 3.2 This practice covers installation of suspended ceiling systems and related components in areas that require resistance to the effects of earthquake motions as defined by ASCE 7 and the International Building Code. 3.3 The practice is broken into two main sections. The first section covers areas with light to moderate earthquake potential (Seismic Design Category C) while the second deals with severe earthquake potential (Seismic Design Category D, E & F). 3.4 This practice includes requirements from multiple sources including previous versions of this practice, CISCA Seismic Recommendations for Direct-hung Acoustical Tile and Lay-in Ceilings, Seismic Zones 0-2 and CISCA Guidelines for Seismic Restraint for Direct Hung Suspended Ceiling Assemblies, Seismic Zones 3 & 4, suspended ceiling requirements from the International Building Code and ASCE 7. The purpose is to combine the requirements from these sources into a single comprehensive document.