Abstract Thin intumescent coating (IC) are nowadays the dominant passive system used to protect structural steel in case of fire. This paper proposes a general procedure for modelling intumescent coating in both simplified and advanced calculation methods, starting from lab-scale test results. The small-scale tests were useful for identifying the parameters that mostly can affect the behaviour of the IC under fire and the salient temperatures, which characterize the IC thermal conductivity. Starting from these results, a standard multivariate linear regression analysis is applied, in order to obtain a general expression for calculating the thermal conductivity of IC, useful for performing analytical and numerical modelling of the IC. Indeed, the proposed formula was validated against both small-scale and real-scale experimental tests, obtaining a very good agreement between experimental and simulated data. The procedure proposed in the paper can be used both in the simplified calculations, according with the prescriptive based approach, and in advanced analyses, using the performance based criteria for structural fire safety.

中文翻译：

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应用在钢构件上的膨胀涂层的热性能建模方法

摘要 薄膨胀涂层 (IC) 是当今主要的被动系统，用于在发生火灾时保护结构钢。本文从实验室规模的测试结果出发，提出了一种在简化和高级计算方法中模拟膨胀涂层的一般程序。小规模测试有助于确定主要影响 IC 在火灾和显着温度下的行为的参数，这些参数表征 IC 的热导率。从这些结果开始，应用标准的多元线性回归分析，以获得用于计算 IC 热导率的一般表达式，可用于执行 IC 的分析和数值建模。事实上，所提出的公式在小规模和实际规模的实验测试中都得到了验证，在实验数据和模拟数据之间获得非常好的一致性。论文中提出的程序既可用于简化计算（根据基于规范的方法），也可用于高级分析（使用基于性能的结构防火安全标准）。