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首页> 外文期刊>Journal of structural fire engineering >The Collapse Behaviour of Cold-formed Steel Portal Frames at Elevated Temperatures
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The Collapse Behaviour of Cold-formed Steel Portal Frames at Elevated Temperatures

机译：高温下冷弯型钢门框的坍塌行为

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摘要

This paper describes the results of non-linear elasto-plastic implicit dynamic finite element analyses that are used to predict the collapse behaviour of cold-formed steel portal frames at elevated temperatures. The collapse behaviour of a simple rigid-jointed beam idealisation and a more accurate semi-rigid jointed shell element idealisation are compared for two different fire scenarios. For the case of the shell element idealisation, the semi-rigidity of the cold-formed steel joints is explicitly taken into account through modelling of the bolt-hole elongation stiffness. In addition, the shell element idealisation is able to capture buckling of the cold-formed steel sections in the vicinity of the joints. The shell element idealisation is validated at ambient temperature against the results of full-scale tests reported in the literature. The behaviour at elevated temperatures is then considered for both the semi-rigid jointed shell and rigid-jointed beam idealisations. The inclusion of accurate joint rigidity and geometric non-linearity (second order analysis) are shown to affect the collapse behaviour at elevated temperatures. For each fire scenario considered, the importance of base fixity in preventing an undesirable outwards collapse mechanism is demonstrated. The results demonstrate that joint rigidity and varying fire scenarios should be considered in order to allow for conservative design.
机译：本文描述了非线性弹塑性隐式动态有限元分析的结果，这些结果用于预测高温下冷弯型钢门框的坍塌行为。针对两种不同的火灾情况，比较了简单的刚性连接梁理想化和更精确的半刚性连接壳单元理想化的倒塌行为。对于壳单元理想化的情况，通过对螺栓孔伸长刚度进行建模，明确考虑了冷弯钢接头的半刚性。另外，壳单元的理想化能够捕获接头附近的冷弯型钢的屈曲。根据文献中报道的全面测试结果，可以在环境温度下验证壳单元的理想化。然后，对于半刚性连接壳和刚性连接梁理想化都考虑了在高温下的行为。结果表明，包括精确的接头刚度和几何非线性（二次分析）会影响高温下的坍塌行为。对于每种考虑的火灾情况，都表明了基础固定在防止不良的向外倒塌机制方面的重要性。结果表明，应考虑接头的刚度和变化的火灾情况，以便进行保守的设计。

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  • 来源
    《Journal of structural fire engineering》 |2015年第2期|77-101|共25页
  • 作者

    Ross P. D. Johnston; Mohammed Sonebi; James B. P. Lim; Cecll G. Armstrong; Andrzej M. Wrzesien; Gasser Abdelal; Ying Hu;

  • 作者单位

    Hanna + Hutchinson Consulting Engineers Ltd, 68 Bow Street, Lisburn, United Kingdom, BT28 1AL,Queen's University Belfast, School of Planning Architecture & Civil Engineering, David Keir Building, Stranmillis Road, Belfast, United Kingdom, BT9 5AG;

    Queen's University Belfast, School of Planning Architecture & Civil Engineering, David Keir Building, Stranmillis Road, Belfast, United Kingdom, BT9 5AG;

    Department of Civil and Environmental Engineering, The University of Auckland, Auckland 1142, New Zealand;

    Queen's University Belfast, School of Mechanical and Aerospace Engineering, Ashby Building, Stranmillis Road, Belfast, United Kingdom, BT9 5AH;

    Capital Steel Ltd, Unit 1, Mary Street, Johnstone, United Kingdom, PA5 8BZ;

    Queen's University Belfast, School of Mechanical and Aerospace Engineering, Ashby Building, Stranmillis Road, Belfast, United Kingdom, BT9 5AH;

    Steel Research Group, School of Civil Engineering, Campus B, Chong Qing University, 174 Sha Zheng Street, Chong Qing, P. R.China, 400045;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fire engineering; portal frame; cold-formed steel; semi-rigid joints; FEA; implicit dynamic analysis;

    机译：消防工程;门架冷弯型钢半刚性接头;有限元分析;隐式动态分析;

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