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首页> 外文期刊>Journal of structural fire engineering >A comparison between CFD and thermal-structural analysis of structural steel members subjected to fire
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A comparison between CFD and thermal-structural analysis of structural steel members subjected to fire

机译：CFD与火灾结构钢构件热结构分析的比较

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Purpose - Standard fire resistance curves such as ASTM El 19 have been used for so long in structural fire practice. The issue with use of these curves that they do not represent real fire scenarios. As a result, the alternatives have been to either conduct experiments or find other tools to represent a real fire scenario. Therefore, the purpose of this paper is to understand the temperature effects resulted from a designed fire on steel beams and whether the standard fire curves represent a designed fire scenario. Design/methodology/approach - Computational fluid dynamics (CFD) models were developed to simulate a designed fire scenario and to understand the structural responses on the beams under elevated temperatures. Consequently, the results obtained from the CFD models were compared with the results of three-dimensional (3D) non-linear finite element (FE) models developed by other researchers. The developed FE models were executed using a standard fire curve (ASTM E119). A parametric study including two case studies was conducted. Findings - Results obtained from performing this study showed the importance of considering fire parameters such as fuel type and flame height during the thermal analysis compared to the standard fire curves, and this might lead to a non-conservative design as compared to the designed fire scenario. The studied cases showed that the steel beams experienced more degradation in their fire resistance at higher load levels under designed fires. Additionally, the models used the standard fire curves underestimated the temperatures at the early stages. Originality/value - This paper shows results obtained by performing a comparison study of models used ASTM E119 curve and a designed fire scenario. The value of this study is to show the variability of using different fire scenarios; thus, more studies are required to see how temperature history curves can be used to represent real fire scenarios.
机译：目的 - 在结构防火实践中已经使用了ASTM EL 19的标准防火曲线。使用这些曲线的问题，它们不代表真实的火灾情景。结果，替代方案是进行实验或找到其他工具来代表真正的火灾情景。因此，本文的目的是了解由钢梁上设计的火灾产生的温度效应以及标准火灾曲线是否代表设计的火灾情景。设计/方法/方法 - 开发了计算流体动力学（CFD）模型以模拟设计的火灾场景，并了解升高温度下梁上的结构响应。因此，将从CFD模型获得的结果与其他研究人员开发的三维（3D）非线性有限元（FE）模型进行了比较。使用标准火灾曲线（ASTM E119）执行开发的FE模型。参数研究包括两个案例研究。结果 - 从执行本研究获得的结果表明，与标准火灾曲线相比，考虑在热分析期间考虑燃料型和火焰高度等火灾参数的重要性，这可能导致非保守的设计与设计的火灾情景相比。所研究的病例表明，在设计的火灾下，钢梁在较高负载水平下的耐火性更加降解。此外，使用标准火灾曲线的模型低估了早期阶段的温度。原创性/值 - 本文显示了通过执行使用ASTM E119曲线的模型的比较研究获得的结果和设计的火场景。本研究的价值是展示使用不同的火灾情景的可变性;因此，需要更多的研究来了解温度历史曲线如何用于代表真实的火灾情景。

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