Double-stud light steel frame (LSF) walls provide an enhanced insulation performance when exposed to fire conditions. However, the behavior of different configurations of such assemblies under fire is not well understood. Thus, this study aimed to assess the fire resistance of non-load-bearing double-stud LSF walls subjected to ISO834 standard fire. The walls were lined with one or two type F gypsum plasterboards on each side, using cavity uninsulated or insulated with ceramic fiber. The experimental tests revealed that a wider cavity slows the heat transfer through the cross-section, delaying the temperature rise on the unexposed surfaces. The use of ceramic fiber insulation substantially increases the fire resistance of the wall and when the cavity is partially filled with this material, if the blanket is placed towards the exposed side, enhanced insulation fire resistance is achieved. Based on the finite element method, a numerical validation was conducted using a special hybrid approach that used experimental temperature values inside the cavities or insulation blankets. This approximation was essential to improve the numerical results. Also, the employment of an air layer, located at specific regions of the models, helped to improve the numerical results, introducing an extra thermal resistance. A new simplified approach was proposed based on the improved design model available in the literature, and the results obtained are consistent with the experimental results. The predicted insulation fire resistance of the numerical and simplified methods agreed well with the experimental results and useful information is supplied to support further numerical and experimental studies.

中文翻译：

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非承重双螺柱轻钢框架墙的防火性能：实验测试、数值模拟和简化方法

双螺柱轻钢框架 (LSF) 墙在暴露于火灾条件下时可提供增强的隔热性能。然而，此类组件的不同配置在火力下的行为尚不清楚。因此，本研究旨在评估承受 ISO834 标准火灾的非承重双螺柱 LSF 墙的耐火性。墙壁的每一侧都衬有一个或两个 F 型石膏板，使用未绝缘或用陶瓷纤维绝缘的空腔。实验测试表明，较宽的空腔会减慢通过横截面的热传递，从而延迟未暴露表面的温升。陶瓷纤维绝缘材料的使用大大提高了墙壁的耐火性，当空腔部分填充这种材料时，如果将毯子朝向暴露的一侧放置，实现了增强的绝缘耐火性。基于有限元方法，使用特殊的混合方法进行了数值验证，该方法使用了空腔或绝缘毯内的实验温度值。这种近似对于改进数值结果是必不可少的。此外，使用位于模型特定区域的空气层有助于改善数值结果，引入额外的热阻。基于文献中可用的改进设计模型提出了一种新的简化方法，所得结果与实验结果一致。数值方法和简化方法的预测绝缘耐火性与实验结果非常吻合，并且提供了有用的信息以支持进一步的数值和实验研究。