1.1本规程描述了确定指定玻璃类型的负载电阻（LR）的程序，包括密封中空玻璃（IG）装置中使用的玻璃类型的组合，暴露在短或长时间的均匀横向负载下，具有指定的断裂概率。 1.2本规程适用于规定设计荷载包括风荷载、雪荷载和总组合幅值小于或等于15 kPa（315 psf）的自重的建筑物中的垂直和斜窗玻璃。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货架。 1.3本规程仅适用于沿一个、两个、三个或四个边缘具有连续横向支撑的矩形单片和夹层玻璃结构。本惯例假设:( 1. )双面、三面和四边支撑条件下的支撑玻璃边缘简单支撑，并在平面内自由滑动；( 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。对于中空玻璃装置，本规程仅适用于具有四边边缘支撑的中空玻璃装置。 1.4本规程不适用于任何形式的有线、图案、蚀刻、喷砂、钻孔、切口或沟槽玻璃，其表面和边缘处理会改变玻璃强度。 1.5本规程仅涉及测定玻璃对均匀横向载荷的阻力。所选玻璃的最终厚度和类型还取决于各种其他因素（参见 5.3 ). 1.6本规程中的图表提供了一种确定近似最大横向玻璃挠度的方法。 附录X1 提供了确定四边简支玻璃最大横向挠度的附加程序。 1.7以国际单位制表示的数值应视为标准。括号中给出的数值用于将英寸-磅单位进行数学转换，仅供参考，不被视为标准值。 1.8 附录X2 列出了用于计算中强制类型因子的关键变量 表1- 3. 并对其保守的价值观进行了评论。 表1单片玻璃或夹层玻璃（LG）单个Lite的玻璃类型系数（GTF） GTF公司 玻璃类型 短时负荷（3秒） 长期负荷（30天） 一个 1 0.43 HS 2. 0 1.3 英尺 4 3 表2短期荷载下双层中空玻璃（IG）的玻璃类型系数（GTF） Lite 1号 单片玻璃或 夹层玻璃类型 Lite 2号 单片玻璃或夹层玻璃类型 一个 HS 英尺 GTF1 GTF2 GTF1 GTF2 GTF1 GTF2 一个 0.9 0.9 1 1.9 1 3.8 HS 1.9 1 1.8 1.8 1.9 3.8 英尺 3.8 1 3.8 1.9 3.6 3.6 表3:长期荷载（30天）下双层中空玻璃（IG）的玻璃类型系数（GTF） Lite 1号 单片玻璃或 夹层玻璃类型 Lite 2号 单片玻璃或夹层玻璃类型 一个 HS 英尺 GTF1 GTF2 GTF1 GTF2 GTF1 GTF2 一个 0.39 0.39 0.43 1.25 0.43 2.85 HS 1.25 0.43 1.25 1.25 1.25 2.85 英尺 2.85 0.43 2.85 1.25 2.85 2.85 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====== 5.1本规程用于确定暴露在均匀横向荷载下的指定玻璃类型和结构的LR。 5.2本惯例的使用假设: 5.2.1玻璃无边缘损坏，并正确上釉， 5.2.2玻璃未被滥用， 5.2.3玻璃的表面状况是使用多年的典型玻璃，由于暴露表面上有轻微磨损，因此比新制造的玻璃更弱， 5.2.4玻璃边缘支撑系统足够坚硬，以将支撑玻璃边缘的横向挠度限制在不超过 1. / 175 他们的长度。该计算应使用规定的设计荷载。 5.2.5玻璃中心偏转不会导致边缘支撑损失。 注1 — 这种做法并没有解决由玻璃偏转引起的美学问题。 5.3在选择玻璃类型和厚度时，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、地震效应、热流、边缘咬合、噪音消除、潜在的破碎后后果等。 此外，建筑规范中规定的考虑因素以及安全玻璃标准和现场具体问题中提出的标准可能会控制最终的玻璃类型和厚度选择。 5.4对于本标准中未明确提及的情况，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 describes 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, etched, sandblasted, drilled, notched, or grooved glass with surface and edge treatments that alter the glass strength. 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 5.3 ). 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 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for mathematical conversions to inch-pound units that are provided for information only and are not considered standard. 1.8 Appendix X2 lists the key variables used in calculating the mandatory type factors in Tables 1- 3 and comments on their conservative values. TABLE 1 Glass Type Factors (GTF) for a Single Lite of Monolithic or Laminated Glass (LG) GTF Glass Type Short Duration Load (3 s) Long Duration Load (30 days) AN 1.0 0.43 HS 2.0 1.3 FT 4.0 3.0 TABLE 2 Glass Type Factors (GTF) for Double Glazed Insulating Glass (IG), Short Duration Load Lite No. 1 Monolithic Glass or Laminated Glass Type Lite No. 2 Monolithic Glass or Laminated Glass Type AN HS FT GTF1 GTF2 GTF1 GTF2 GTF1 GTF2 AN 0.9 0.9 1.0 1.9 1.0 3.8 HS 1.9 1.0 1.8 1.8 1.9 3.8 FT 3.8 1.0 3.8 1.9 3.6 3.6 TABLE 3 Glass Type Factors (GTF) for Double Glazed Insulating Glass (IG), Long Duration Load (30 day) Lite No. 1 Monolithic Glass or Laminated Glass Type Lite No. 2 Monolithic Glass or Laminated Glass Type AN HS FT GTF1 GTF2 GTF1 GTF2 GTF1 GTF2 AN 0.39 0.39 0.43 1.25 0.43 2.85 HS 1.25 0.43 1.25 1.25 1.25 2.85 FT 2.85 0.43 2.85 1.25 2.85 2.85 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 ====== 5.1 This practice is used to determine the LR of specified glass types and constructions exposed to uniform lateral loads. 5.2 Use of this practice assumes: 5.2.1 The glass is free of edge damage and is properly glazed, 5.2.2 The glass has not been subjected to abuse, 5.2.3 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, 5.2.4 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. 5.2.5 The center of glass deflection will not result in loss of edge support. Note 1 — This practice does not address aesthetic issues caused by glass deflection. 5.3 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, seismic effects, heat flow, edge bite, noise abatement, potential post-breakage consequences, and so forth. 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. 5.4 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.