An experimental study of the influence of an exposed combustible ceiling on compartment fire dynamics has been performed. The fire dynamics in compartments with combustible cross-laminated timber ceilings vs non-combustible reinforced concrete ceilings in otherwise identical compartments with three different ventilation factors were investigated. The experimental results are compared against predictions from two theoretical models for compartment fire dynamics: (a) the parametric fire model given in EN 1991-1-2, and (b) a model developed at Technische Universität Braunschweig, which are the parametric fire models currently used in Germany. It is confirmed that the introduction of a combustible timber ceiling leads to higher temperatures within the enclosure, both under fuel-controlled and ventilation-controlled scenarios. It is also demonstrated that the theoretical models considered in this article require refinement in order to adequately represent all relevant scenarios when combustible ceilings are present. A refinement of the German model, by adding the fuel from the combustible ceiling to the occupancy fuel load, was shown to not adequately capture the response for the ventilation-controlled fires.

中文翻译：

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具有交叉层压木材天花板的外壳火灾动力学

已对暴露的可燃天花板对隔间火灾动力学的影响进行了实验研究。研究了具有可燃交叉层压木材天花板的隔间与具有三种不同通风系数的其他相同隔间中不可燃钢筋混凝土天花板的隔间的火灾动力学。将实验结果与两个隔间火灾动力学理论模型的预测进行比较：(a) EN 1991-1-2 中给出的参数火灾模型，和 (b) 布伦瑞克工业大学开发的模型，它们是参数火灾模型目前在德国使用。经证实，在燃料控制和通风控制的情况下，可燃木材天花板的引入会导致外壳内的温度升高。还证明本文中考虑的理论模型需要改进，以便在存在可燃天花板时充分代表所有相关场景。德国模型的改进，通过将可燃天花板的燃料添加到占用燃料负载，显示不能充分捕捉通风控制火灾的响应。