Cladding assemblies are façade systems made of cladding panels such as aluminum composite materials (ACMs) and high-pressure laminates (HPLs), and layers of continuous insulation (CI) and weather resistive barrier (WRB). Recent incidents of catastrophic fires involving cladding assemblies have warranted efforts to understand their fire hazards and develop engineering risk mitigation guidelines for existing constructions. This research provides a comprehensive fire performance evaluation of cladding assemblies exposed to realistic fire scenarios. Twelve cladding assemblies, with a combination of four types of claddings, four types of CIs, and two WRBs are selected. The tests are conducted using the 16-ft (4.9 m) high parallel panel test (16-ft PPT) method of ANSI/FM 4880 standard; the method imparts realistic >100 kW/m² heat flux to the wall assemblies. The results show that the chemical heat release rate (HRR) based evaluation criterion used in the 16-ft PPT provides an objective and robust assessment of fire performance. The wall assemblies comprising of thermoplastic-core ACMs demonstrated accelerated flame spread within a matter of a few minutes, regardless of the combustibility of the CI used. At low heat flux exposures, unlike severe fire scenarios of the 16-ft PPT, it is shown that the thermoplastic-core ACMs appear to perform favorably. The fire-retardant ACM and HPL assemblies reveal limited flame spread, regardless of whether the CI used in the assembly was charring combustible or noncombustible. Lastly, for the assemblies evaluated, the flammability of claddings exhibits greater influence on the overall performance of the wall system, while the CI and WRB affect the system performance in a secondary manner.

中文翻译：

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使用 ANSI/FM 4880 的 16 英尺高平行面板测试方法评估覆层墙组件的防火性能

覆层组件是由铝复合材料 (ACM) 和高压层压板 (HPL) 等覆层板以及连续绝缘层 (CI) 和耐候性屏障 (WRB) 制成的外墙系统。最近发生的涉及覆层组件的灾难性火灾事件需要努力了解其火灾危害并为现有建筑制定工程风险缓解指南。这项研究提供了对暴露于真实火灾场景的覆层组件的综合防火性能评估。选择了十二个包层组件，其中包含四种类型的包层、四种类型的 CI 和两种 WRB。测试使用 ANSI/FM 4880 标准的 16 英尺（4.9 米）高平行面板测试（16 英尺 PPT）方法进行；该方法赋予现实 >100 kW/m ²壁组件的热通量。结果表明，在 16 英尺 PPT 中使用的基于化学热释放率 (HRR) 的评估标准提供了对防火性能的客观而可靠的评估。无论使用的 CI 的可燃性如何，由热塑性核心 ACM 组成的壁组件在几分钟内表现出加速的火焰蔓延。在低热通量暴露下，与 16 英尺 PPT 的严重火灾场景不同，结果表明热塑性芯材 ACM 似乎表现良好。阻燃 ACM 和 HPL 组件显示出有限的火焰蔓延，无论组件中使用的 CI 是炭化可燃还是不可燃。最后，对于评估的组件，包层的可燃性对墙体系统的整体性能有更大的影响，