A series of experiments have been conducted to measure the in‐depth heating of laminated bamboo samples subjected to heat fluxes of 5, 10, 30, and 60 kW/m2, either perpendicular or parallel to the grain. These heat fluxes were chosen to induce different phenomena within the material—from inert heating to moisture evaporation, pyrolysis, oxidation, and flaming—so that the effects of these can be isolated and evaluated separately by simple heat‐transfer models. Moisture migration along the fibres becomes a critical factor when bamboo is heated parallel to the grain, resulting in increased convective heat transfer to deeper parts of the material and an accumulation of moisture in depth that accentuates the endothermic plateau in the temperature profiles around 100°C. Average charring rates for 60 minutes of exposure under 60 kW/m2 were 0.74 and 0.70 mm/min for perpendicular and parallel heating, respectively. The thickness of the heated layer was much larger for parallel heating due to moisture migration, which is less significant perpendicular to the grain. Inert heat diffusion is a good approximation at heat fluxes of 5 and 10 kW/m2, but exothermic oxidation reactions become critical above 400°C and must be included in future models.

中文翻译：

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火灾条件下竹层压结构的热行为

已经进行了一系列实验来测量层压竹样品在 5、10、30 和 60 kW/m2 的热通量下的深度加热，垂直或平行于纹理。选择这些热通量以在材料内引发不同的现象——从惰性加热到水分蒸发、热解、氧化和燃烧——以便可以通过简单的传热模型分离和单独评估这些影响。当竹子与谷物平行加热时，水分沿着纤维迁移成为一个关键因素，导致对材料更深部分的对流热传递增加，水分在深处积聚，从而加剧了 100°C 左右温度曲线中的吸热平台. 在 60 kW/m2 下暴露 60 分钟的平均炭化率分别为 0.74 和 0。垂直和平行加热分别为 70 毫米/分钟。由于水分迁移，平行加热的加热层厚度要大得多，垂直于谷物的影响较小。在 5 和 10 kW/m2 的热通量下，惰性热扩散是一个很好的近似值，但放热氧化反应在 400°C 以上变得至关重要，必须包含在未来的模型中。