1.1 本规程涵盖了确定特定玻璃类型（包括密封中空玻璃（IG）单元中使用的玻璃类型组合）的耐负荷（LR）的程序，暴露于短时间或长时间的均匀横向负荷下，达到特定的破损概率。 1.2 本规程适用于指定设计荷载包括风荷载、雪荷载和自重的建筑物中的垂直和倾斜玻璃，总组合强度小于或等于15 kPa（315 psf）。本规程不适用于其他应用，包括但不限于栏杆、玻璃地板、水族馆、结构玻璃构件和玻璃架。 1.3 本规程仅适用于矩形的单片和夹层玻璃结构，沿一个、两个、三个或四个边缘具有连续的横向支撑。此做法假设( 1. )用于双面、三面和四边支撑条件的支撑玻璃边缘是简单支撑的，并且在平面内自由滑动；( 2. )两侧支撑的玻璃充当简支梁；和 3. )一侧支撑的玻璃充当悬臂。对于中空玻璃单元，此做法仅适用于具有四边边缘支撑的中空玻璃单元。 1.4 本规程不适用于任何形式的有线、图案化、喷砂、钻孔、缺口或凹槽玻璃。此做法不适用于表面或边缘处理会降低玻璃强度的玻璃。 注1: 众所周知，搪瓷会影响玻璃负载电阻。请咨询制造商以获得指导。 1.5 本规程仅用于确定玻璃对均匀横向荷载的抵抗力。所选玻璃的最终厚度和类型也取决于各种其他因素（参见 6.3 ). 1.6 该实践中的图表提供了一种确定近似最大玻璃横向偏转的方法。 附录X1 提供了额外的程序来确定简单支撑在四边上的玻璃的最大横向偏转。 1.7 附录X2 列出了中用于计算强制类型因子的关键变量 表1- 3. 以及对其保守价值观的评论。 1.8 以国际单位制表示的数值应视为标准。SI单位后括号中给出的值仅供参考，不被视为标准值。 1.9 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。 1.10 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《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====== 6.1 本规程用于确定暴露在均匀横向荷载下的特定玻璃类型和结构的LR。 6.2 使用此做法的前提是: 6.2.1 玻璃没有边缘损坏，并且已适当上釉。 6.2.2 玻璃没有被滥用。 6.2.3 玻璃的表面状况是使用了几年的典型玻璃，由于暴露表面有轻微磨损，因此比新制造的玻璃更弱。 6.2.4 玻璃边缘支撑系统足够坚硬，可将支撑玻璃边缘的横向偏转限制在不超过 1. / 175 他们的长度。此计算应使用规定的设计荷载。 6.2.5 玻璃或支撑系统或两者的偏转不应导致玻璃边缘支撑的损失。玻璃咬合减少或拔出应使用中引用的方法进行考虑 ( 1. ) . 3. 注2: 应对玻璃挠度进行审查。这种做法并没有解决由玻璃偏转引起的美学问题。 注3: 本规程未考虑偏转对中空玻璃单元密封性能的影响。 注4: 设计师/工程师必须根据 附件A1 ，非因数负荷图。 6.3 玻璃类型和厚度的选择应考虑许多其他因素。这些因素包括但不限于:热应力、钢化玻璃的自发破碎、风载碎片的影响、过度偏转、玻璃碎片破碎后的行为、爆炸、地震影响、建筑运动、热流、边缘咬合、噪音消除和潜在的- 破损后果。此外，建筑规范中规定的考虑因素以及安全玻璃标准中提出的标准和特定地点的考虑因素可能会控制最终玻璃类型和厚度的选择。 6.4 对于本标准中未具体说明的情况，设计专业人员应使用工程分析和判断来确定建筑物中玻璃的LR。

1.1 This practice covers procedures to determine the load resistance (LR) of specified glass types, including combinations of glass types used in a sealed insulating glass (IG) unit, exposed to a uniform lateral load of short or long duration, for a specified probability of breakage. 1.2 This practice applies to vertical and sloped glazing in buildings for which the specified design loads consist of wind load, snow load and self-weight with a total combined magnitude less than or equal to 15 kPa (315 psf). This practice shall not apply to other applications including, but not limited to, balustrades, glass floor panels, aquariums, structural glass members, and glass shelves. 1.3 This practice applies only to monolithic and laminated glass constructions of rectangular shape with continuous lateral support along one, two, three, or four edges. This practice assumes that ( 1 ) the supported glass edges for two, three, and four-sided support conditions are simply supported and free to slip in plane; ( 2 ) glass supported on two sides acts as a simply supported beam; and ( 3 ) glass supported on one side acts as a cantilever. For insulating glass units, this practice only applies to insulating glass units with four-sided edge support. 1.4 This practice does not apply to any form of wired, patterned, sandblasted, drilled, notched, or grooved glass. This practice does not apply to glass with surface or edge treatments that reduce the glass strength. Note 1: Ceramic enamel is known to affect glass load resistance. Consult the manufacturer for guidance. 1.5 This practice addresses only the determination of the resistance of glass to uniform lateral loads. The final thickness and type of glass selected also depends upon a variety of other factors (see 6.3 ). 1.6 Charts in this practice provide a means to determine approximate maximum lateral glass deflection. Appendix X1 provides additional procedures to determine maximum lateral deflection for glass simply supported on four sides. 1.7 Appendix X2 lists the key variables used in calculating the mandatory type factors in Tables 1- 3 and comments on their conservative values. 1.8 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.10 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 ====== 6.1 This practice is used to determine the LR of specified glass types and constructions exposed to uniform lateral loads. 6.2 Use of this practice assumes: 6.2.1 The glass is free of edge damage and is properly glazed. 6.2.2 The glass has not been subjected to abuse. 6.2.3 The surface condition of the glass is typical of glass that has been in service for several years, and is weaker than freshly manufactured glass due to minor abrasions on exposed surfaces. 6.2.4 The glass edge support system is sufficiently stiff to limit the lateral deflections of the supported glass edges to no more than 1 / 175 of their lengths. The specified design load shall be used for this calculation. 6.2.5 The deflection of glass or support system, or both, shall not result in loss of glass edge support. The glass bite reduction or pullout shall be considered using the method referenced in ( 1 ) . 3 Note 2: Glass deflections are to be reviewed. This practice does not address aesthetic issues caused by glass deflection. Note 3: This practice does not consider the effects of deflection on insulating glass unit seal performance. Note 4: The designer/engineer must determine what constitutes sufficient glass edge support based on Annex A1 , Non-Factored Load Charts. 6.3 Many other factors shall be considered in glass type and thickness selection. These factors include but are not limited to: thermal stresses, spontaneous breakage of tempered glass, the effects of windborne debris, excessive deflections, behavior of glass fragments after breakage, blast, seismic effects, building movement, heat flow, edge bite, noise abatement, and potential post-breakage consequences. In addition, considerations set forth in building codes along with criteria presented in safety-glazing standards and site-specific concerns may control the ultimate glass type and thickness selection. 6.4 For situations not specifically addressed in this standard, the design professional shall use engineering analysis and judgment to determine the LR of glass in buildings.