Fire resistance of steel beams with integrated fire-resistant and decorative constructions

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research Pub Date : 2024-10-21 DOI:10.1016/j.jcsr.2024.109096

Chengyi Chu , Xunan Ye , Bo Fu , Lei Zhang , Wang Gao , Dongdong Fan

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Abstract

This paper investigates the fire resistance of steel beams with integrated fire-resistant and decorative constructions. Four novel forms of fire protection constructions that simultaneously meet the requirements of fire protection and decorative performance in steel residential housing are first devised. Five simply supported H-shaped steel beams encased by such constructions are tested in a fire test furnace to reveal the variation of their temperature fields and mechanical properties under the ISO-834 standard heating condition. A series of test phenomena, temperature-time and displacement-time curves are obtained from the tests. Corresponding results show that the specimens are far from reaching their ultimate limit state, which validates the effectiveness of the proposed constructions in fire protection. Additionally, the influence on the fire resistance caused by the variation of the construction components is determined by comparing the temperatures and displacements of all the specimens. Finally, a finite element model corresponding to the specimens is established in the FE software package ABAQUS. The heat transfer and thermal-mechanical coupling analyses are conducted in succession, and the model is verified compared with the experiment results. Then a preliminary parametric study is carried out, revealing that the thickness and thermal conductivity of non-intumescent fire-retardant coating and the thickness of autoclaved aerated concrete blocks may affect the fire resistance of the encased steel beams perceptibly.

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集成防火和装饰结构的钢梁的耐火性能

本文研究了防火与装饰一体化结构钢梁的耐火性能。首先设计了四种同时满足钢结构住宅防火和装饰要求的新型防火结构。在防火试验炉中对五根由此类结构包裹的简支撑 H 型钢梁进行了试验，以揭示其在 ISO-834 标准加热条件下的温度场和机械性能变化。试验获得了一系列试验现象、温度-时间和位移-时间曲线。相应的结果表明，试样远未达到其极限状态，这验证了拟议结构在防火方面的有效性。此外，通过比较所有试样的温度和位移，确定了建筑构件的变化对耐火性能的影响。最后，在有限元软件包 ABAQUS 中建立了与试样相对应的有限元模型。先后进行了传热和热机械耦合分析，并将模型与实验结果进行了对比验证。然后进行了初步的参数研究，发现非膨胀阻燃涂层的厚度和导热系数以及蒸压加气混凝土砌块的厚度会明显影响包覆钢梁的耐火性能。

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

Journal of Constructional Steel Research 工程技术-工程：土木

CiteScore

7.90

自引率

19.50%

发文量

550

审稿时长

46 days

期刊介绍： The Journal of Constructional Steel Research provides an international forum for the presentation and discussion of the latest developments in structural steel research and their applications. It is aimed not only at researchers but also at those likely to be most affected by research results, i.e. designers and fabricators. Original papers of a high standard dealing with all aspects of steel research including theoretical and experimental research on elements, assemblages, connection and material properties are considered for publication.