Abstract In the recent past, the necessity to have a better understanding of fire dynamics and of the full structural response under real fires was the motivation for several large-scale non-standard fire tests. Nowadays, the novel need to better comprehend the fire dynamics behind the so called “travelling fires” underlined the limitations of those non-standard fire tests. The lack of standardised procedures does not allow making effective comparisons and drawing scientific conclusion from these tests. The fire group of Liege University performed eleven non-standard or “natural fire” tests within the context of the RFCS research project TRAFIR sponsored by the E.U. Commission (grant N°754,198). The aim of this experimental campaign was to determine a uniformly distributed fuel arrangement that would lead to a medium fire growth as recommended for office buildings in Eurocode 1. This paper presents the test results in terms of fire growth rate, flame length, temperature along the flame centreline, fluxes at a distance from the fire and temperatures on wood sticks. The outcomes define a uniformly distributed fuel load arrangement leading to a desired fire development and also provide valuable experimental information on the fire dynamics related to fire spread. In conclusion, a well-established methodology to perform natural fire tests has been defined, from the ignition system up to the exact fuel arrangement. This methodology could be used in the future for natural fire tests in order to allow a comparison of different conditions (ventilations, geometry, nature of the boundaries, etc.) while considering the same fire load distribution to understand, for example, the conditions in which a travelling fire can develop or not. The experimental results reported here can also be used to validate or calibrate various existing or future sub-models developed by other authors.

中文翻译：

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具有均匀分布的纤维素火灾载荷的传播试验

摘要 近年来，为了更好地了解火灾动力学和真实火灾下的完整结构响应，需要进行一些大规模的非标准火灾试验。如今，小说需要更好地理解所谓的“移动火灾”背后的火灾动力学，这突显了这些非标准火灾测试的局限性。由于缺乏标准化程序，因此无法对这些测试进行有效比较并得出科学结论。列日大学的火灾小组在欧盟委员会赞助的 RFCS 研究项目 TRAFIR 的背景下进行了 11 次非标准或“自然火灾”测试（授权 N°754,198）。该实验活动的目的是确定一种均匀分布的燃料布置，该布置将导致欧洲规范 1 中为办公楼推荐的中等火势增长。本文介绍了火势增长速率、火焰长度、沿线温度的测试结果。火焰中心线、远离火的通量和木棒上的温度。结果定义了均匀分布的燃料负荷安排，导致预期的火势发展，并提供了与火势蔓延相关的火势动力学的宝贵实验信息。总而言之，从点火系统到精确的燃料布置，已经定义了一种行之有效的自然火灾测试方法。这种方法可以在未来用于自然火灾测试，以便在考虑相同的火灾荷载分布的同时比较不同的条件（通风、几何形状、边界的性质等），以了解例如移动火灾可以发展与否。此处报告的实验结果还可用于验证或校准其他作者开发的各种现有或未来子模型。