Cold-formed Light gauge Steel Frame (LSF) floor-ceiling systems are commonly made with non-combustible fire protective membrane to protect the steel floor joists in fire. Thermal improvements to the fire protective membrane delay the heat transfer to structural elements and provide enhanced fire resistance level. Hence, this study addresses the thermal performance of different fire resistant board configurations under standard fire conditions to compare and propose improvements to conventional systems. Small-scale fire tests were conducted for a range of configurations of gypsum plasterboard, calcium silicate board and magnesium oxide board with the inclusion of thin steel sheathing. Fire test results showed that gypsum plasterboard and calcium silicate board performed very similar in regards to insulation criterion based failure times, while magnesium oxide board performed considerably worse. In all cases steel sheathing provided improved failure times. Improvements of 48%, 33% and 47% were obtained for gypsum plasterboard, calcium silicate board and magnesium oxide board when steel sheathing was used. This paper presents the details of the small-scale fire tests of different fire resistant board configurations and the results of time-temperature profiles. Based on these results, optimum fire resistant board configurations are recommended to achieve higher fire resistance levels for LSF floor-ceiling systems.

中文翻译：

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标准火灾条件下耐火板配置的实验研究

冷成型轻型钢框架 (LSF) 地板天花板系统通常采用不燃防火膜制成，以保护钢地板托梁在火灾中。防火膜的热改进延迟了向结构元件的热传递，并提供了更高的耐火水平。因此，本研究解决了标准火灾条件下不同耐火板配置的热性能，以比较和提出对传统系统的改进。对包括薄钢护套的石膏石膏板、硅酸钙板和氧化镁板的一系列配置进行了小规模防火测试。防火测试结果表明，石膏石膏板和硅酸钙板在基于绝缘标准的失效时间方面表现非常相似，而氧化镁板的表现则差很多。在所有情况下，钢护套都提供了改进的故障时间。当使用钢护套时，石膏石膏板、硅酸钙板和氧化镁板分别获得了 48%、33% 和 47% 的改进。本文介绍了不同耐火板配置的小规模防火测试的详细信息以及时间-温度曲线的结果。基于这些结果，推荐最佳耐火板配置以实现 LSF 地板天花板系统的更高耐火水平。本文介绍了不同耐火板配置的小规模防火测试的详细信息以及时间-温度曲线的结果。基于这些结果，推荐最佳耐火板配置以实现 LSF 地板天花板系统的更高耐火水平。本文介绍了不同耐火板配置的小规模防火测试的详细信息以及时间-温度曲线的结果。基于这些结果，推荐最佳耐火板配置以实现 LSF 地板天花板系统的更高耐火水平。