Abstract Light gauge steel frame (LSF) floor-ceiling systems are increasingly used in buildings without a full understanding of their thermal and fire resistance performance. Hence a numerical study was undertaken on the thermal performance of LSF floor-ceiling systems with varying configurations under standard fire conditions. The configurations included Lipped Channel and rivet fastened Rectangular Hollow Flange Channel section joists, gypsum plasterboard lining, steel sheathing, structural plywood and rockwool fibre insulation. The measured elevated temperature thermal property data of the above floor system components were included in the 3D thermal finite element models and the results were compared with fire test results. A good comparison showed that the developed finite element models can be used to simulate the thermal behaviour of LSF floor-ceiling systems with varying configurations. A parametric study was then undertaken to extend the thermal performance data in terms of time-temperature profiles for LSF floor-ceiling systems. Finite element analyses showed that the new LSF floor-ceiling system with the addition of thin steel sheathing performed significantly better than conventional systems. The use of thin steel sheathing on both sides of plasterboard showed further improvements. The use of cavity insulation was shown to be detrimental and thus improved floor-ceiling configurations were proposed.

中文翻译：

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具有不同配置的 LSF 地板天花板系统的热建模

摘要 轻型钢框架 (LSF) 地板天花板系统越来越多地用于建筑物，但对其热和耐火性能没有充分了解。因此，对标准火灾条件下具有不同配置的 LSF 地板天花板系统的热性能进行了数值研究。配置包括唇形槽钢和铆钉紧固矩形空心法兰槽钢截面托梁、石膏石膏板衬里、钢护套、结构胶合板和岩棉纤维绝缘材料。测量的上述地板系统组件的高温热性能数据包含在 3D 热有限元模型中，并将结果与​​防火测试结果进行比较。一个很好的比较表明，开发的有限元模型可用于模拟具有不同配置的 LSF 地板天花板系统的热行为。然后进行参数研究以扩展 LSF 地板天花板系统的时间-温度曲线方面的热性能数据。有限元分析表明，添加了薄钢护套的新型 LSF 地板天花板系统的性能明显优于传统系统。在石膏板两侧使用薄钢护套显示出进一步的改进。使用空腔绝缘材料被证明是有害的，因此提出了改进的地板天花板配置。然后进行参数研究以扩展 LSF 地板天花板系统的时间-温度曲线方面的热性能数据。有限元分析表明，添加了薄钢护套的新型 LSF 地板天花板系统的性能明显优于传统系统。在石膏板两侧使用薄钢护套显示出进一步的改进。使用空腔绝缘材料被证明是有害的，因此提出了改进的地板天花板配置。然后进行参数研究以扩展 LSF 地板天花板系统的时间-温度曲线方面的热性能数据。有限元分析表明，添加了薄钢护套的新型 LSF 地板天花板系统的性能明显优于传统系统。在石膏板两侧使用薄钢护套显示出进一步的改进。使用空腔绝缘材料被证明是有害的，因此提出了改进的地板天花板配置。