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首页> 外文期刊>Journal of testing and evaluation >Service Life PredictionMethod for Concrete and Prestressed Concrete Bridges under Chloride-Aggressive Environments
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Service Life PredictionMethod for Concrete and Prestressed Concrete Bridges under Chloride-Aggressive Environments

机译：氯化物侵蚀环境下混凝土和预应力混凝土桥梁使用寿命预测方法

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摘要

The behavior of concrete and prestressed concrete bridges under chloride-aggressive environments during their service life is influenced not only by load (especially fatigue forces) but also by the corrosion environment. At present, the research of working performance and life prediction of bridges mainly focuses on the role of force or takes a single parameter as failure criterion, such as chloride ion concentration and steel bar depassivation. In this article, the service life prediction model of concrete and prestressed concrete bridges subjected to chloride-aggressive environments and fatigue is established, and the interaction of environmental effects and fatigue is taken into full account based on the mechanism of heat and mass transfer in porous media, the metal corrosion theory, and the classical mechanics theory. Taking depassivation as a demarcation point, the calculation method for the service life of concrete and prestressed concrete bridges is developed by analyzing the service life evolution process and determining the failure criterion. The service life of concrete bridges in coastal areas is calculated by the self-compiled program with MATLAB software (MathWorks, Natick, MA), and the results show good agreement with those in the project example. According to the results of the service life calculation with different increments of the number of fatigue loading cycles, Delta N, the increment of the number of fatigue loading cycles Delta N has an influence of no more than 5 % on the service life. This indicates that the calculation is converged and stable and that the calculation results are reliable. The service life of bridges is shortened with the increase of surface chloride concentration of concrete, daily vehicle traffic volume and load level, and the decrease of the concrete cover thickness. The study results are referred to predict the service life of concrete and prestressed concrete bridges under chloride-aggressive environments.
机译：混凝土和预应力混凝土桥梁在使用寿命长的氯化物环境下的行为不仅受载荷（尤其是疲劳力）的影响，还受到腐蚀环境的影响。目前，桥梁的工作性能和寿命预测研究主要集中在力的作用或以氯离子浓度和钢筋钝化等单一参数为破坏准则。本文建立了混凝土和预应力混凝土桥梁在氯离子侵蚀环境和疲劳作用下的使用寿命预测模型，并基于多孔介质中传热传质的机理，充分考虑了环境效应与疲劳的相互作用。介质，金属腐蚀理论和经典力学理论。以去钝化为分界，通过分析使用寿命演化过程并确定破坏准则，提出了混凝土和预应力混凝土桥梁使用寿命的计算方法。沿海地区混凝土桥梁的使用寿命是使用MATLAB软件（MathWorks，Natick，MA）通过自编译程序计算得出的，其结果与项目示例的结果吻合良好。根据疲劳负载循环次数增量N不同增加的使用寿命计算结果，疲劳负载循环次数增量N对使用寿命的影响不超过5％。这表明计算收敛且稳定，计算结果可靠。随着混凝土表面氯化物浓度的增加，每日车辆通行量和负荷水平的增加以及混凝土表层厚度的减小，桥梁的使用寿命会缩短。研究结果可用于预测在氯化物侵蚀环境下混凝土和预应力混凝土桥梁的使用寿命。

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