For structural steel components protected by spray-applied fire-resistive materials (SFRMs), variations in the thermal properties and thickness of SFRM may influence steel temperatures during fires. This paper presents a sensitivity analysis of the influence of assumed thermal properties and thickness of SFRM on predicted steel temperatures in fire. For this purpose, material test data in the literature on the thermal properties of SFRMs were used to determine reasonable bounds for three variables: thermal conductivity, volumetric heat capacity, and insulation thickness. Fifteen material models were developed assuming temperature-independent values for these variables based on a face-centered central composite experiment design. Finite element models were developed for three structural fire experiments. In addition, a fourth model of a composite beam was developed with localized hole in the SFRM representing an ID tag, which in practice is affixed to beam webs. Each model was analyzed using the fifteen material models. The choice of SFRM thermal properties had a significant influence on steel temperatures, and statistical analysis of the experimental design showed that steel temperatures increased with increasing thermal conductivity, and decreased with increasing thickness and volumetric heat capacity. The influence of volumetric heat capacity was smaller than that of thermal conductivity and thickness.

对于受喷涂防火材料（SFRM）保护的结构钢部件，SFRM的热性能和厚度的变化可能会影响着火期间的钢温。本文对假定的热性能和SFRM厚度对火灾中的预测钢温的影响进行了敏感性分析。为此，文献中有关SFRM的热性能的材料测试数据用于确定三个变量的合理界限：导热系数，体积热容和绝缘厚度。根据面心为中心的中央实验设计，假设这些变量的温度无关值，开发了十五种材料模型。针对三个结构火灾实验开发了有限元模型。此外，开发了复合梁的第四个模型，该模型在SFRM中具有表示ID标签的局部孔，该孔实际上是固定在梁腹板上的。使用十五种材料模型对每个模型进行了分析。SFRM热性能的选择对钢温度有显着影响，对实验设计的统计分析表明，钢温度随着导热系数的增加而升高，而随着厚度和体积热容量的增加而降低。体积热容的影响小于热导率和厚度的影响。SFRM热性能的选择对钢温度有显着影响，对实验设计的统计分析表明，钢温度随着导热系数的增加而升高，而随着厚度和体积热容量的增加而降低。体积热容的影响小于热导率和厚度的影响。SFRM热性能的选择对钢温度有显着影响，对实验设计的统计分析表明，钢温度随着导热系数的增加而升高，而随着厚度和体积热容量的增加而降低。体积热容的影响小于热导率和厚度的影响。