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Predicting the fire resistance of timber members loaded in tension

机译:预测承受拉力的木材构件的耐火性

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摘要

The paper presents a numerical model for predicting the fire resistance of timber members. Fire resistance is evaluated in a two-step process implemented in the Abaqus finite element code: first, a time-dependent thermal analysis of the member exposed to fire and then a structural analysis under a constant load are performed. The structural analysis considers the reduction in mechanical properties (modulus of elasticity and strength) of timber with temperature. The analysis terminates when the member can no longer redistribute stresses from the hottest to the coldest parts, leading to structural failure. The model was used to simulate fire tests carried out on specimens made from laminated veneer lumber loaded in tension. Experimental data in terms of temperature, charring depth, displacement and failure time were compared with the numerical results obtained by assuming the thermal properties and degradation of mechanical properties with temperature as suggested by Eurocode 5, showing an overall acceptable approximation. The fire resistance of the timber member was then predicted depending upon the applied tensile loads using the numerical model and analytical formulas. The proposed finite element model can be used to predict the fire resistance of timber structures as an alternative to expensive and complicated experimental tests.
机译:本文提出了一种预测木材构件耐火性的数值模型。耐火性通过Abaqus有限元代码中实现的两步过程进行评估:首先,对暴露于火中的构件进行随时间变化的热分析,然后在恒定载荷下进行结构分析。结构分析考虑了木材的机械性能(弹性模量和强度模量)随温度降低的情况。当构件不再能够将应力从最热的部分重新分配到最冷的部分时,分析将终止,从而导致结构破坏。该模型用于模拟对层压木单板木材进行拉伸试验时进行的防火测试。将温度,炭化深度,位移和失效时间等方面的实验数据与通过假定热性能和机械性能随温度下降而获得的数值结果进行了比较(如欧洲规范5所示),显示出总体可接受的近似值。然后,使用数值模型和解析公式,根据所施加的拉伸载荷来预测木材构件的耐火性。拟议的有限元模型可以用来预测木结构的耐火性,以替代昂贵而复杂的试验。

著录项

  • 来源
    《Fire and materials》 |2013年第2期|114-129|共16页
  • 作者单位

    Department of Architecture, Design and Urban Planning, University of Sassari, Alghero, Italy;

    Department of Structural Engineering, University of Cagliari, Cagliari, Italy;

    Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand;

    Department of Civil Engineering and Architecture, University of Trieste, Trieste, Italy;

    Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand;

    Department of Structural Engineering, University of Cagliari, Cagliari, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    abaqus; charring; experimental testing; finite element model; fire resistance; thermal-structural analysis; timber; wood;

    机译:abaqus烧焦实验测试;有限元模型防火性能;热结构分析;木材;木;
  • 入库时间 2022-08-18 00:11:20

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