The fire resistance of composite slabs with steel decking, in Europe, is usually defined using simple calculation models provided by the Eurocode EN 1994-1-2. For assessing the methodology of these simple calculation methods, a new advanced calculation method is presented, using the software ANSYS. The numerical model is first validated with experimental data reported on bibliography and then a parametric analysis is conducted to better understand the effect of the load level on the composite structure under fire. The validation of the simulations consisted of three different models: the first model considers perfect contact between the steel deck and the concrete topping, and the two following models consider the existence of an air gap between these materials, acting as a thermal resistance on the temperature field through the thickness of the slab. The numerical results show good approximation to the experimental results, mainly when using the non-perfect contact model, reaching 3.88% and 16.91% of difference with respect to the insulation and load-bearing criteria, respectively. Based on the validation models, a parametric study is presented, modifying the load level from 10% up to 75%. New simple calculation models are presented to define the fire resistance of composite slabs, considering the load level, and the debonding effect between the concrete and the steel deck.

中文翻译：

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荷载水平对火灾条件下钢盖板复合板抗力的影响

在欧洲，带钢甲板的复合板的耐火性通常使用欧洲规范 EN 1994-1-2 提供的简单计算模型来定义。为了评估这些简单计算方法的方法论，提出了一种使用 ANSYS 软件的新的高级计算方法。该数值模型首先用参考书目报告的实验数据进行验证，然后进行参数分析以更好地了解载荷水平对火灾下复合结构的影响。模拟的验证由三个不同的模型组成：第一个模型考虑了钢桥面板和混凝土顶部之间的完美接触，而以下两个模型考虑了这些材料之间存在气隙，在整个板厚的温度场上充当热阻。数值结果显示出与实验结果的良好近似，主要是在使用非完美接触模型时，绝缘和承载标准分别达到 3.88% 和 16.91% 的差异。基于验证模型，提出了一个参数研究，将负载水平从 10% 修改为 75%。提出了新的简单计算模型来定义复合板的耐火性，考虑到荷载水平以及混凝土和钢桥面板之间的脱粘效应。分别。基于验证模型，提出了一个参数研究，将负载水平从 10% 修改为 75%。提出了新的简单计算模型来定义复合板的耐火性，考虑荷载水平以及混凝土和钢桥面板之间的脱粘效应。分别。基于验证模型，提出了一个参数研究，将负载水平从 10% 修改为 75%。提出了新的简单计算模型来定义复合板的耐火性，考虑荷载水平以及混凝土和钢桥面板之间的脱粘效应。