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Energy based equivalent approach for evaluating fire resistance of reinforced concrete beams.

机译：基于能量的等效方法，用于评估钢筋混凝土梁的耐火性。

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摘要

Provisions of fire resistance is one of the key considerations in building design since fire represents most severe hazard experienced by built infrastructure during their life time. Current fire resistance provisions do not account for critical factors in evaluating fire resistance of reinforced concrete (RC) members and hence are not applicable for realistic fire performance assessment of RC members. Rational design approaches for evaluating realistic fire resistance of RC members can be achieved through the use of time equivalency. Existing time equivalency methods have a number of limitations and are derived for protected steel members and may not be applicable for RC members.;This thesis presents the development of an energy based approach for evaluating time equivalent of RC members under realistic fire scenarios. To generate large amount of data required for development of energy based method, a macroscopic finite element model has been extended to cover beams with T and I cross-sections. The validated numerical model is used to undertake a set of parametric studies on RC beams. Data from the parametric studies is used for validating the proposed energy based approach. Regression analysis has been applied to the data set and a correlation between the ratio of time equivalent predicted by the finite element model and equal energy method has been established. Based on the results, it is shown that the proposed energy based approach provides a better estimate of time equivalent for RC beams than current approaches.
机译：耐火性是建筑设计中的关键考虑因素之一，因为火灾是建筑基础设施在其使用寿命期间遭受的最严重危害。当前的耐火规定并未考虑评估钢筋混凝土（RC）构件的耐火性的关键因素，因此不适用于RC构件的实际防火性能评估。可以通过使用时间等效性来实现评估RC构件实际耐火性的合理设计方法。现有的时间等效方法有很多局限性，是针对受保护的钢构件而提出的，可能不适用于钢筋混凝土构件。本文提出了一种基于能量的方法，用于评估真实火灾情况下钢筋混凝土构件的时间等效。为了生成开发基于能量的方法所需的大量数据，已扩展了宏观有限元模型，以涵盖具有T和I截面的梁。经过验证的数值模型用于对RC梁进行一组参数研究。来自参数研究的数据用于验证所提出的基于能量的方法。对数据集进行了回归分析，并建立了有限元模型预测的时间当量比与等能量方法之间的相关性。基于结果，表明与当前方法相比，所提出的基于能量的方法可以更好地估计RC梁的等效时间。

著录项

  • 作者

    Pakala, Purushotham.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Engineering Civil.
  • 学位 M.S.
  • 年度 2009
  • 页码 164 p.
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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