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首页> 外文期刊>Journal of structural fire engineering >Experimental and numerical study on the fire response of cold-formed steel beams with elastically restrained thermal elongation
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Experimental and numerical study on the fire response of cold-formed steel beams with elastically restrained thermal elongation

机译：弹性约束热伸长冷弯型钢梁火灾响应的实验与数值研究

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Purpose - This paper is mainly aimed at the structural performance of compound cold-formed galvanised steel beams under fire conditions based on the results of a large programme of experimental tests and numerical simulations. The main objective of this research was to assess the critical temperature and time of the studied beams. Other important goals of this research work were to investigate the influence of the cross-sections (C, lipped-Ⅰ, R and 2R beams) and, above all, of the axial restraint (0, 0.45, 3, 7.5,15, 30, ∞ kN/mm) to the thermal elongation of the beam and the rotational restraint at beam supports (0,15,80,150, 300,1,200 and ∞ kN.m/rad) on the fire resistance of this kind of beams. Design/methodology/approach - This paper still provides details of the simulation methodology for achieving numerical stability and faithful representation of detailed structural behaviour and compares the simulation and experimental results, including beam failure modes, measured beam axial forces and beam mid-span deflections. Findings - Good agreement between Abaqus simulations and experimental observations confirms that the finite element models developed with the Abaqus/standard solver are suitable for predicting the structural fire behaviour of restrained cold-formed steel beams. Originality/value - The results showed above all that the effect of the stiffness of the surrounding structure seems to decrease with the increasing slenderness of the beams.
机译：目的-本文基于大量实验测试和数值模拟的结果，主要针对复合冷弯镀锌钢梁在火灾条件下的结构性能。这项研究的主要目的是评估所研究光束的临界温度和时间。这项研究工作的其他重要目标是研究横截面（C，I型，R型和2R型横梁）的影响，尤其是轴向约束的影响（0、0.45、3、7.5、15、30 ，∞kN / mm）对梁的热伸长率和梁支撑处的旋转约束（0,15,80,150，300,1,200和∞kN.m / rad）的影响。设计/方法/方法-本文仍然提供了用于实现数值稳定性和忠实表示详细结构行为的仿真方法的详细信息，并比较了仿真和实验结果，包括梁破坏模式，测得的梁轴向力和梁中跨挠度。发现-Abaqus模拟与实验观察结果之间的良好一致性证明，使用Abaqus /标准求解器开发的有限元模型适合预测受约束的冷弯型钢梁的结构火灾行为。原创性/价值-结果首先表明，周围结构刚度的影响似乎随着梁的细长度的增加而降低。

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