Thermoplastic expanded polystyrene (EPS) external thermal insulation composite systems (ETICS) have caused serious results due to the ravages of frequent fire disasters in the world. Fire propagation of EPS ETICS was observed to be fast over exterior building wall, however, very few reports of time‐averaged fire propagation speed (FPS) is available currently. To have a quantitative understanding of FPS, a series of EPS ETICS façades were tested according to the intermediate‐scale Japanese JISA 1310 standard method. EPS thickness of ETICS varies from 100 mm to 300 mm and heat release rate (HRR) of window spilled flame differs from 600 kW to 1100 kW. It indicates that the time‐averaged FPS vs vertical distance is observed to be positive linear. The acceleration of FPS is found to be linear with a dimensionless item, which involves fire propagation index (FPI), HRR of window spilled flame and thickness of EPS. Finally, a calculation method for an upward fire spreading profile is proposed, which initially provides a theoretical basis for evaluation of the reaction‐to‐fire performance of EPS ETICS façade.

中文翻译：

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膨胀聚苯乙烯外保温复合系统砌体幕墙时均向上传播速度的试验研究

热塑性膨胀聚苯乙烯（EPS）外部隔热复合材料系统（ETICS）由于世界上频繁发生的火灾而遭受严重破坏。观察到EPS ETICS在建筑物外墙上的蔓延速度很快，但是，目前几乎没有关于时间平均蔓延速度（FPS）的报告。为了对FPS有定量的了解，根据中等规模的日本JISA 1310标准方法对一系列EPS ETICS外墙进行了测试。ETICS的EPS厚度从100毫米到300毫米不等，窗户溢出火焰的热释放率（HRR）从600千瓦到1100千瓦不等。这表明时间平均FPS与垂直距离之间呈正线性关系。发现FPS的加速度与无因次项呈线性关系，其中包括火灾蔓延指数（FPI），窗户溢出火焰的HRR和EPS的厚度。最后，提出了一种向上蔓延分布图的计算方法，该方法初步为评估EPS ETICS外立面的火灾反应性能提供了理论基础。