1.1本规程涵盖了隔音砖和铺设面板的悬吊系统的安装及其对两组建筑的附加要求，这两组建筑的建造是为了抵抗ASCE 7和《国际建筑规范》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具有管辖权的当局应确定本惯例的适用性。 1.3规范C 635 练习C 636 涵盖悬架系统及其安装，而不特别考虑地震横向约束需求。它们仍然适用，并应在规定本惯例时予以遵守。 1.4本惯例无意扼杀新产品或方法的研发。 本规范无意阻止任何材料的安装或禁止本规范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机构可接受的可验证工程数据或全面动态测试证实。 1.5 1000英尺的天花板面积 2. [92.9米 2. ]小于等于5.2.8的侧向力支撑要求除外。 1.6由石膏板制成的天花板，由螺钉或钉子固定在悬吊构件上，悬吊构件在一个水平面上支撑从墙壁延伸到墙壁的天花板，不受本惯例要求的约束。 1.7由结构的链条或电缆支撑的自由浮动天花板（未直接连接到任何结构墙）无需满足地震力要求，前提是它们满足以下要求: 1.7.1此类项目的设计荷载应等于垂直工作重量的1.4倍。 1.7.2应根据5.7考虑地震相互作用效应。 1.7.3与结构的连接应允许360 ° 水平面内的运动范围。 1.8以英寸-磅或国际单位制表示的数值应视为标准值。在文本中，国际单位显示在括号中。每个系统中规定的值不是精确的等价物；因此，每个系统应相互独立使用。合并两个系统的值会导致不符合规范。 1.9 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和健康实践，并确定监管限制的适用性。 ====意义和用途====== 本规程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。具有管辖权的当局应确定本惯例对当地规范要求的适用性。 本规程涵盖在需要抵抗ASCE 7和《国际建筑规范》定义的地震运动影响的区域安装吊顶系统和相关组件。 实践分为两个主要部分。第一节涵盖具有轻微至中度地震潜力的区域（抗震设计类别C），而第二节涉及严重地震潜力（抗震设计类别D、E） & F） 。 本规程包括多个来源的要求，包括本规程的早期版本、CISCA关于直接悬挂吸声瓦和铺设天花板的抗震建议、地震区0-2和CISCA关于直接悬挂吊顶组件抗震约束的指南、地震区3 & 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合并到一个综合文档中。

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 Specification C 635 and Practice C 636 cover suspension systems and their installation without special regard to seismic lateral restraint needs. They remain applicable and shall be followed when this practice is specified. 1.4 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. 1.5 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. 1.6 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. 1.7 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: 1.7.1 The design load for such items shall equal 1.4 times the vertical operating weight. 1.7.2 Seismic interaction effects shall be considered in accordance with 5.7. 1.7.3 The connection to the structure shall allow a 360 ° range of motion in the horizontal plane. 1.8 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. 1.9 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 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. 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. 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). 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.