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Behaviour of steel beams connected to CFT column in fire during cooling stage

机译：冷却阶段连接到CFT柱的钢梁在火灾中的行为

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摘要

This paper focuses on steel framed structures using Concrete Filled Tubular (CFT) columns andrnthe objective of this paper is to find means of reducing the risk of structural failure during cooling. It reportsrnthe results of a study using the general finite element software ABAQUS to numerically model the behaviourrnof restrained structural subassemblies of steel beam to CFT columns and their joints in fire, emphasizing onrnthe cooling stage. Validation of the finite element model was achieved by comparing the simulation and testrnresults for the two fire tests investigating cooling behaviour using reverse channel and fin plate connections,rnrecently conducted at the University of Manchester. The finite element models give very good agreement withrnthe experimental results and observations. Remarkable differences in tensile forces in the connected beamsrnwere observed during the tests depending on the beam temperature at which cooling started. This leads to thernsuggestion that in order to avoid connection fracture during cooling, it may be possible to reduce the limitingrntemperature of the connected beam by a small value (<50℃) from the limiting temperature calculated withoutrnconsidering any axial restraints in the beam.
机译：本文着重于使用钢管混凝土（CFT）柱的钢框架结构，并且本文的目的是寻找减少冷却过程中结构破坏风险的方法。它报告了使用通用有限元软件ABAQUS对火灾中CFT柱及其接头的钢梁受约束性能的结构子组件进行数值模拟的研究结果，强调了冷却阶段。有限元模型的验证是通过比较两个火灾测试的仿真结果和测试结果进行的，这两个火灾测试是使用反向通道和翅片板连接进行的，这两个测试最近在曼彻斯特大学进行。有限元模型与实验结果和观察结果非常吻合。在测试期间，根据冷却开始时的梁温度，观察到所连接梁中的拉力存在显着差异。因此，为了避免冷却过程中的连接破裂，建议在不考虑梁的轴向约束的情况下，将所计算梁的极限温度从计算出的极限温度降低一个较小的值（<50℃）。

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  • 来源
    《Tubular structures XIV》|2012年|631-638|共8页
  • 会议地点 London(GB)
  • 作者

    S. Elsawaf; Y.C.Wang; P. Mandal;

  • 作者单位

    School of Mechanical, Aerospace and Civil Engineering, University of Manchester, UK;

    School of Mechanical, Aerospace and Civil Engineering, University of Manchester, UK;

    School of Mechanical, Aerospace and Civil Engineering, University of Manchester, UK;

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  • 正文语种 eng
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