Size effect on the fire resistance of multilayer composite floor structures

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-03-13 DOI:10.1016/j.ijthermalsci.2025.109861

Junhao Gao, Jie Xu, Jin Lin, Shouxiang Lu

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引用次数: 0

Abstract

The current standard methods for evaluating the fire resistance of high-speed train floor structures involve large-scale experiments that incur significant costs. To explore the feasibility of reducing the scale of these structural fire resistance tests, this study develops a two-dimensional numerical simulation model to assess the fire resistance of multilayer floor structures. The model's accuracy and applicability are rigorously validated through various fire resistance experiments conducted at multiple scales. The study emphasizes the dynamic thermal response of high-speed train floor structures, demonstrating a clear correlation between structural scale and fire resistance. Notably, the times to thermal insulation failure and integrity failure of multilayer composite floor structures decrease progressively with increasing scale. This trend can be described by an exponential function. Additionally, the model is employed to examine the effect of the ratio of the exposed surface size to the actual material size on fire resistance, with larger ratios leading to more rapid fire resistance failures.

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多层复合楼板结构防火性能的尺寸效应

目前评价高速列车楼面结构耐火性能的标准方法涉及大规模试验，成本高昂。为探索减少结构防火试验规模的可行性，本研究建立了多层楼板结构防火性能的二维数值模拟模型。通过多尺度的耐火实验，验证了模型的准确性和适用性。研究重点是高速列车楼板结构的动态热响应，表明结构规模与耐火性之间存在明显的相关性。值得注意的是，多层复合楼盖结构的保温破坏次数和完整性破坏次数随着规模的增大而逐渐减少。这种趋势可以用指数函数来描述。此外，该模型还用于检验暴露表面尺寸与实际材料尺寸之比对耐火性能的影响，该比例越大，耐火失效越快。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.