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Computational framework for durability assessment of reinforced concrete structures under coupled deterioration processes.

机译：耦合劣化过程下钢筋混凝土结构耐久性评估的计算框架。

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摘要

A reinforced concrete structure may degrade through a combination of coupled physical, chemical and mechanical deterioration processes. This study develops an integrated finite element-based computational framework to quantitatively evaluate the resultant mechanical responses of reinforced concrete structures exposed to multiple coupled environmental loadings. Heat transfer and associated thermal expansion contraction process, moisture transport and associated wetting expansion/drying shrinkage process, carbon dioxide transport and associated carbonation process, chloride penetration process, reinforcement corrosion and rust expansion process due to chloride contamination, as well as the subsequent crack initiation and propagation are taken into account. Interaction effects among multiple coupled processes are considered by adjusting the transport properties of concrete through multifactor equations. The crack propagation analysis is implemented using a smeared cracking approach, and the crack-induced accelerated deterioration process is modeled using relative crack density concepts. The developed computational framework is general and flexible, which makes it possible to include additional deterioration processes.; Due to a large amount of random variability and uncertainty existing in the material properties of concrete, various environmental loadings and the developed computational framework, an appropriate approach for assessing the structural durability is to combine the deterministic computational framework with advanced stochastic modeling. The most influential random variables in the computational framework are identified, and a nonlinear response surface is established through combining experimental design with multilevel regression. Monte Carlo simulation is then performed with the response surface to predict the statistics of service life and assess the associated time-dependent failure probability of reinforced concrete structures. Sensitivity analysis is implemented to quantify the influence of each random variable on the estimation of service life.
机译：钢筋混凝土结构可能会通过物理，化学和机械退化过程的结合而退化。这项研究开发了一个基于有限元的集成计算框架，以定量评估暴露于多种环境载荷的钢筋混凝土结构的机械响应。传热和相关的热膨胀收缩过程，水分输送和相关的湿润膨胀/干燥收缩过程，二氧化碳的输送和相关的碳酸化过程，氯化物渗透过程，由于氯化物污染导致的增强腐蚀和生锈膨胀过程以及随后的裂纹萌生和传播都考虑在内。通过多因素方程调整混凝土的传输特性，可以考虑多个耦合过程之间的相互作用效应。裂纹扩展分析是使用涂抹裂纹方法进行的，并且裂纹诱导的加速劣化过程是使用相对裂纹密度概念建模的。所开发的计算框架是通用且灵活的，这使得可能包括其他恶化过程。由于混凝土材料性能，各种环境负荷和发达的计算框架中存在大量的随机变异性和不确定性，因此评估结构耐久性的合适方法是将确定性计算框架与先进的随机建模相结合。确定计算框架中影响最大的随机变量，并通过将实验设计与多级回归相结合来建立非线性响应面。然后用响应面进行蒙特卡洛模拟，以预测使用寿命的统计数据，并评估钢筋混凝土结构随时间而变的故障概率。进行敏感性分析以量化每个随机变量对使用寿命估计的影响。

著录项

  • 作者

    Chen, Dong.;

  • 作者单位

    Vanderbilt University.;

  • 授予单位 Vanderbilt University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 252 p.
  • 总页数 252
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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