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Numerical modelling and performance of reinforced concrete members under fire condition.

机译：火灾下钢筋混凝土构件的数值模拟和性能。

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摘要

A thermo-mechanical finite element model is developed to study the behaviour of reinforced concrete columns and beams exposed to fire. Two different analyses are included in this model. A three-dimensional nonlinear transient heat conduction analysis that takes into account the variation of the thermal properties of concrete with temperature is first conducted. The temperature profile resulting from the exposure of a reinforced concrete member to fire is determined by the heat transfer analysis and is then exported to a stress analysis model. A special nonlinear fibre frame element is used in this model. The stress analysis incorporates a material model that takes into account the variation of the mechanical properties of concrete and steel with temperature. The model is capable of predicting different modes of failure resulting from excessive loss of strength and/or stiffness of a reinforced concrete structure subjected to fire. The model can predict the fire endurance of reinforced concrete members, which is defined as the duration of fire exposure after which the member fails. Various levels of validation are conducted for this interactive thermo-mechanical model through comparison with closed form and numerical solutions as well as with results of fire tests conducted on reinforced concrete members. An extensive parametric study is then conducted using the developed numerical model. Parameters that significantly affect the performance and fire endurance of reinforced concrete columns and beams are identified.;Keywords. Finite element, Numerical Model, Non-linear, Heat Transfer, Temperature, Fire, Reinforced Concrete, Columns, Beams, Performance, Resistance.
机译：建立了热机械有限元模型，以研究钢筋混凝土圆柱和梁在火中的行为。该模型包括两种不同的分析。首先进行了三维非线性瞬态热传导分析，该分析考虑了混凝土的热性能随温度的变化。通过传热分析确定钢筋混凝土构件暴露于火中产生的温度曲线，然后将其导出到应力分析模型。在该模型中使用了特殊的非线性纤维框架单元。应力分析包含一个材料模型，该模型考虑了混凝土和钢材的机械性能随温度的变化。该模型能够预测由于火灾引起的钢筋混凝土结构强度和/或刚度的过度损失而导致的不同破坏模式。该模型可以预测钢筋混凝土构件的耐火性，定义为构件遭受破坏后的火警持续时间。通过与封闭形式和数值解进行比较以及对钢筋混凝土构件进行的防火测试结果，对该交互式热力机械模型进行了各种级别的验证。然后使用已开发的数值模型进行广泛的参数研究。确定了对钢筋混凝土柱和梁的性能和耐火性有重大影响的参数。有限元，数值模型，非线性，传热，温度，火灾，钢筋混凝土，圆柱，梁，性能，阻力。

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  • 作者

    Moftah, Mohamed.;

  • 作者单位

    The University of Western Ontario (Canada).;

  • 授予单位 The University of Western Ontario (Canada).;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 286 p.
  • 总页数 286
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

  • 入库时间 2022-08-17 11:38:29

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