It is of great interest to understand the stabilization effect of steel structures by steel claddings in fire. Structural fire analysis using finite‐element method, including temperature analysis and structural analysis, is important to investigate the stabilization effect. However, temperature‐dependent thermal material data for the insulation layer of sandwich panels and the intumescent paint for fire protection of steel sections are still scarce. In this paper, the available thermal properties of these materials from the literature are summarized, and 2D and 3D temperature analyses were carried out for steel sections with steel claddings, such as sandwich panels with mineral wool and polyisocyanurate (PIR) cores and trapezoidal sheeting with mineral wool insulation. The analysis results were compared with the fire tests conducted in European research project STABFI (Stabilization of Steel Structures by Steel Claddings in Fire). The study shows reasonable accuracy of modeling using existing thermal material data for temperature‐dependent insulation properties and thermal data for intumescent paint, for intumescent coatings (IC) protected steel beam with mineral wool sandwich panel and trapezoidal sheeting claddings. Larger discrepancy between finite element (FE) prediction and test measurement was observed for the case of sandwich cladding with PIR core. Gaps for further research were identified. The study also shows the heat sink effect of the steel section by sandwich panels with a mineral wool core. Therefore, it is recommended that the sandwich panels should be included in the thermal analysis model for steel sections with sandwich claddings.

中文翻译：

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火灾下带钢包层膨胀漆保护的钢结构的温度分析

了解钢结构在火灾中对钢结构的稳定作用具有极大的兴趣。使用有限元方法进行结构火灾分析，包括温度分析和结构分析，对于研究稳定效果至关重要。但是，仍然缺乏夹心板保温层和用于钢型材防火的膨胀涂料的温度相关热材料数据。在本文中，总结了这些材料从文献中可获得的热性能，并对带有钢包层的钢型材（例如，具有矿棉和聚异氰脲酸酯（PIR）芯的夹芯板以及带有铝箔的梯形板）进行了二维和3D温度分析矿棉绝缘。将分析结果与欧洲研究项目STABFI（火灾中的钢覆层对钢结构的稳定化）进行的耐火测试进行了比较。这项研究表明，使用现有的热材料数据（取决于温度的绝缘性能）和膨胀型涂料的热数据，具有矿棉夹芯板和梯形板覆层的膨胀型涂料（IC）保护的钢梁，可以合理地建模。对于带有PIR芯的夹心包层，在有限元（FE）预测和测试测量之间存在较大差异。确定了需要进一步研究的空白。该研究还显示了带有矿棉芯的夹芯板对钢型材的散热效果。因此，