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首页> 外文会议>International Symposium on Safety Science and Technology; 20061024-27; Changsha(CN) >Two Dimensional Moisture Diffusion in FRP Bonded Concrete Beam
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Two Dimensional Moisture Diffusion in FRP Bonded Concrete Beam

机译：FRP粘结混凝土梁中的二维水分扩散

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摘要

The bond between FRP and concrete substrate can be significantly deteriorated by the moisture at adhesive layer and bond interface region. Therefore, structural safety and reliability of FRP strengthened concrete structures is directly correlated to the quantity and distribution of moisture at adhesive layer and bond interface region. In this study, diffusion of moisture in adhesively bonded FRP-concrete is studied analytically. The close-form solutions for diffusion in concrete and FRP substrate are based on the classical theory of diffusion and are used to derive equation in two-dimension section. In the analysis, the constant diffusion coefficients and constant surface evaporation coefficients are adopted for the diffusion of moisture in FRP and adhesive layer respectively. The solution is obtained applying the method of separation of variables to the diffusion partial differential equation associated with the surface evaporation boundary conditions and the moisture flux continuum conditions at the bond interface. The solution is of the form of a coupled infinite series in the two space dimensions with an exponential time dependency and in the case of two-layer composite beam, expressions are given in a form suitable for desk calculations.
机译：粘合剂层和粘结界面区域的水分会严重破坏FRP与混凝土基材之间的粘结力。因此，FRP增强混凝土结构的结构安全性和可靠性与粘合剂层和粘结界面区域的水分含量和分布直接相关。在这项研究中，通过分析研究了水分在胶结FRP混凝土中的扩散。在混凝土和FRP基体中扩散的封闭形式解是基于经典扩散理论的，并用于导出二维截面中的方程。在分析中，水分在FRP和粘结层中的扩散分别采用恒定的扩散系数和恒定的表面蒸发系数。该解决方案是通过将变量的分离方法应用于与键界面处的表面蒸发边界条件和湿气通量连续条件相关的扩散偏微分方程而获得的。该解决方案的形式是在两个空间维度上具有指数时间依赖性的耦合无限级数，在两层复合梁的情况下，表达式以适合于台式计算的形式给出。

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