1.1 本规程涵盖了暴露于标准环境条件和长期暴露于高温后，用商用阻燃剂处理的单板层积材（LVL）压力评估程序。 1.2 使用覆盖层或阻燃涂料和涂层的LVL产品需要考虑其他因素，不在本规程范围内。 1.3 为rim板应用制造的LVL产品需要考虑其他因素，不在本规程范围内。 1.4 本规程提供了一种确定阻燃处理（FRT）LVL设计值的方法。其目的不是排除使用替代方法来推导设计值，例如试验方法 D5664 和实践 D6841 对于FRT木材。 1.5 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、健康和环境实践，并确定监管限制的适用性。 1.6 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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 从中获得的设计值 4.2 允许在最终使用温度不超过38℃的设计中使用 °C（100 °F）。 5.1.1 中评估的性能的平均测试值 4.2 ( f tr，0 )和 4.3 ( f tr，108 )应用于确定最终使用温度超过38℃的FRT LVL的设计值调整系数 °C（100 °F），但不超过66 °C（150 °F）。这些应用中还应采用符合国家木材结构设计规范（NDS）的温度调整系数。

1.1 This practice covers procedures for the evaluation of laminated veneer lumber (LVL) pressure-treated with commercially available fire retardants after exposure to both standard environmental conditions and an extended exposure to elevated temperature. 1.2 LVL products utilizing overlays or fire-retardant paints and coatings require other considerations and are outside of the scope of this practice. 1.3 LVL products manufactured for rim board applications require other considerations and are outside of the scope of this practice. 1.4 This practice provides one method to establish design values for fire-retardant treated (FRT) LVL. It is not intended to preclude the use of alternative methods for deriving design values, such as Test Method D5664 and Practice D6841 for FRT lumber. 1.5 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. 1.6 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 ====== 5.1 Design values obtained from 4.2 are permitted for use in design where the end-use temperature does not exceed 38 °C (100 °F). 5.1.1 The mean test values for the properties evaluated in 4.2 ( f tr,0 ) and 4.3 ( f tr,108 ) shall be used to determine design value adjustment factors for FRT LVL that will be exposed to end-use temperatures in excess of 38 °C (100 °F) but not exceeding 66 °C (150 °F). Temperature adjustment factors in accordance with the National Design Specification for Wood Construction (NDS) shall also be applied in these applications.