1.1本规程涵盖了一种程序，用于确定退火建筑平板玻璃在规定的破裂概率下，对暴露在阳光和阴影下引起的热诱导应力的抵抗力( P b ). 正确使用该程序旨在减少建筑物中退火玻璃的热破裂可能性。 1.2本规程适用于建筑物中的垂直或倾斜玻璃。 1.3本规程适用于矩形单片玻璃和夹层玻璃，并假设所有玻璃边缘均得到简单支撑。 1.4本规程仅适用于退火平板钠钙硅玻璃，具有干净切割、接缝、平磨或研磨抛光边缘，无损坏。玻璃可以是透明的或着色的，也可以是涂层的（不包括降低玻璃发射率的涂层）。 1.5本规程不适用于任何形式的有线、图案、蚀刻、喷砂、钻孔、切口或沟槽玻璃或具有表面和边缘处理的玻璃，1.4中所述的除外，这些处理会改变玻璃强度。 1.6本规程不涉及均匀荷载，例如风荷载和雪荷载、安全要求、火灾或抗冲击性。 1.7以国际单位制表示的数值应视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。有关将各种测量系统中的量转换为国际单位制的信息，请参阅IEEE/ASTM SI-10 . 1.8 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====== 本惯例的使用假设: 玻璃边缘应无损坏， 玻璃应适当上釉， 玻璃不得被滥用，以及 玻璃边缘支撑允许玻璃因热膨胀和收缩而在平面内移动。 本规程并未解决导致退火玻璃中热诱导应力的所有因素。未解决的因素包括:瞬态热应力、HVAC寄存器、隔热窗户覆盖物、吊顶和其他热阱、由外部反射引起的太阳辐照度增加、传热系数的变化（本文所述稳态分析假设的变化除外）以及由太阳以外的热源引起的应力。除上述因素外，其他因素也可能引起热应力。 在选择玻璃时，应考虑许多其他因素。这些因素包括但不限于机械引起的应力、风效应、风载碎片影响、过度偏转、地震效应、热流、噪音消除、潜在的破坏后后果等。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。 正确使用本规程旨在降低建筑物中退火窗户玻璃的热致破裂风险。

1.1 This practice covers a procedure to determine the resistance of annealed architectural flat glass to thermally induced stresses caused by exposure to sun and shadows for a specified probability of breakage ( P b ). Proper use of this procedure is intended to reduce the possibility of thermal breakage of annealed glass in buildings. 1.2 This practice applies to vertical or sloped glazing in buildings. 1.3 This practice applies to monolithic and laminated glass of rectangular shape and assumes that all glass edges are simply supported. 1.4 This practice applies only to annealed flat soda-lime silica glass with clean cut, seamed, flat ground, or ground and polished edges that are free from damage. The glass may be clear or tinted as well as coated (not including coatings that reduce emissivity of the glass). 1.5 This practice does not apply to any form of wired, patterned, etched, sandblasted, drilled, notched, or grooved glass or glass with surface and edge treatments, other than those described in 1.4, that alter the glass strength. 1.6 This practice does not address uniform loads such as wind and snow loads, safety requirements, fire, or impact resistance. 1.7 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. For conversion of quantities in various systems of measurements to SI units refer to IEEE/ASTM SI-10 . 1.8 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 ====== Use of this practice assumes: the glass edges shall be free from damage, the glass shall be properly glazed, the glass shall not have been subjected to abuse, and the glass edge support allows in-plane movement of the glass due to thermal expansion and contraction. This practice does not address all factors that cause thermally induced stresses in annealed glass. Factors that are not addressed include: transient thermal stresses, HVAC registers, thermally insulating window coverings, drop ceilings and other heat traps, increased solar irradiance caused by exterior reflections, variations in heat transfer coefficients other than those assumed for the steady state analysis described herein, and stresses induced by thermal sources other than the sun. Factors other than those listed above may also induce thermal stress. Many other factors shall be considered in glass selection. These factors include, but are not limited to, mechanically induced stresses, wind effects, windborne debris impacts, excessive deflections, seismic effects, heat flow, 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. The proper use of this practice is intended to reduce the risk of thermally induced breakage of annealed window glass in buildings.