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Fire resistance of composite slabs with steel deck under natural fire

机译：自然火灾下钢甲板复合板坯的耐火性

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Purpose - Most of the numerical research and experiments on composite slabs with a steel deck have been developed to study the effect of fire during the heating phase. This manuscript aims to describe the thermal behaviour of composite slabs when submitted to different fire scenarios, considering the heating and cooling phase. Design/methodology/approach - Three-dimensional numerical models, based on finite elements, are developed to analyse the temperatures inside the composite slab and, consequently, to estimate the fire resistance, considering the insulation criteria (I). The numerical methods developed are validated with experimental results available in the literature. In addition, this paper presents a parametric study of the effects on fire resistance caused by the thickness of the concrete part of the slab as well as the natural fire scenario. Findings - The results show that, depending on the fire scenario, the fire resistance criterion can be reached during the cooling phase, especially for the thickest composite slabs. Based on the results, new coefficients are proposed for the original simplified model, proposed by the standard. Originality/value - The developed numerical models allow us to realistically simulate the thermal effects caused by a natural fire in a composite slab and the new proposal enables us to estimate the fire resistance time of composite slabs with a steel deck, even if it occurs in the cooling phase.
机译：目的 - 已经开发出具有钢板的复合板上的大部分数值研究和实验，以研究在加热阶段期间的火灾效果。考虑到加热和冷却阶段，该手稿旨在描述复合板坯的热行为。设计/方法/方法 - 基于有限元的三维数值模型进行开发，以分析复合板内的温度，并因此考虑绝缘标准（i）来估算防火抗性。开发的数值方法通过文献中提供的实验结果验证。此外，本文介绍了由板坯混凝土部分的厚度和自然火灾情景引起的对抗抗性影响的参数研究。结果 - 结果表明，根据火灾场景，在冷却阶段可以达到耐火性标准，特别是对于最厚的复合板坯。基于结果，提出了标准提出的原始简化模型的新系数。原创性/值 - 开发的数值模型允许我们实际模拟由复合板坯中的天然火灾引起的热效果，新的提议使我们能够估计复合板与钢甲板的耐火时间，即使它发生在冷却阶段。

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